A refractory block configured to surround an outlet modifies, within a refractory vessel, the flow of molten metal passing through the outlet. The block takes the form of a base through which a main orifice passes, and a wall extending upwards around the periphery of the base. Structural features that may be included in the block include a circumferential lip around the exterior of the wall, an interior volume in which the radius decreases downwardly towards the main orifice in a plurality of steps, and flow openings in the wall that are configured to induce swirling in the flow pattern in the interior volume of the block.
The present invention concerns a lance for top injection of a fluid in metallurgical vessels that is less prone to cracking and comprising: (a) an inner tube (1), (b) a refractory sheath (2) surrounding the inner tube (1), (c) an anchoring point (4) rigidly coupled to said inner tube (1) and at least partially embedded in the refractory sheath (2), (d) an annular gap (1g) separating the inner tube from the refractory sheath; (e) at least one annular guide (5) surrounding the inner tube (1) and comprising: an annular portion (5A) circumscribing the inner tube (1), and at least two anchor protrusions (5P) rigidly extending transversally from the annular portion and at least partially embedded in the refractory sheath (2), wherein a guide gap (5g) is formed between the annular portion and an outer surface of the inner tube. According to the invention said at least two anchor protrusions (5P) are distributed over the external surface of the annular portion, separated from one another by an angle comprised between 90° and 270°.
A lining for a metallurgical vessel is configured to have an engineered porosity. The lining contains a plurality of regions, each extending in a primary plane of the lining, each region having a differing value of total pore or perforation area as measured in a primary plane of the lining. The lining may be used to form part or all of the working surface of the floors or walls of the vessel. In casting use the lining produces an oxidation buffering layer at an interphase of metal melt extending from the interface between metal melt and the walls and floor of the metallurgical vessel, such that when in casting use, the metal flow rate in said oxidation buffering layer is substantially nil, and the concentration of endogenous inclusions, in particular oxides, in said oxidation buffering layer is substantially higher than in the bulk of the metal melt.
B22C 1/00 - Compositions of refractory mould or core materialsGrain structures thereofChemical or physical features in the formation or manufacture of moulds
The present invention concerns an ingot casting shroud (1) comprising structural walls made of a refractory material defining an inner bore (5) extending along and centered about a longitudinal axis, X1, from a bore inlet (5u) located at an inlet end of the ingot casting shroud to a bore outlet (5d) located at an outlet end of the ingot casting shroud, said ingot casting shroud further comprising: (a) An inlet portion (2) including the inlet end and the bore inlet (5u), (b) A tubular portion (3) adjacent the inlet portion and extending along the longitudinal axis, X1, and through which the inner bore extends, and (c) An outlet portion (4) including the outlet end and bore outlet (5d), said outlet portion being adjacent to the tubular portion (3) and separated from the inlet portion (2) by said tubular portion, and comprising an outlet structural wall made of a refractory material defined by an outer outlet peripheral surface (4out) separated from the bore by a thickness of the outlet structural wall, Characterized in that, a portion of the outer outlet peripheral surface (4out) extending over a perimeter of the outlet portion is provided with a resilient layer (6) having a resiliency of at least 70%, wherein the resiliency is defined as the ratio, H1 / HO, of the thickness, H1, of a product after the compression and relaxation of a compressive force which reduces the original thickness to 50% of its original thickness, HO, to its original thickness, HO, measured at room temperature on a sample (6t) of dimensions L1 x L2 x HO collected from the resilient layer (6).
The present invention concerns a thin slab nozzle for casting thin slabs made of metal at a very high mass-flow, said thin slab nozzle comprising: a central bore (50) defined by a bore wall and opening at inlet orifice (50μ) and extending therefrom along the longitudinal axis XI until it is closed at an upstream end (10μ) of a divider (10), said central bore comprising: an upstream bore portion (50a) comprising the inlet orifice and extending over a height, Ha, and, adjacent thereto, forming an upstream boundary (5a) with a converging bore portion (50e) of height He located in the connecting portion of the thin slab nozzle, and adjacent thereto a thin bore portion (50f) of height Hf located in the diffusing portion of the thin slab nozzle and ending at the level of the upstream end (10μ) of the divider (10), first and second front ports (51) separated from one another by said divider (10) and coupled to the central bore portion (50a) at least partially at the converging bore portion (50e); characterized in that, in a section of the thin slab nozzle along the first symmetry plane Π1 defined by (X1, X2) wherein X2 is normal to X1, the geometry of the wall of the central bore (50) is characterized as follows: - the radius of curvature at any point of the bore wall of the converging bore portion (50e) is finite, and the ratio of the height, Hf, of the thin bore portion (50f) to the height, He, of the converging bore portion (50e) is not more than 1, Hf/He ≤1.
A refractory formulation containing an anhydrous solvent, an oleophilic rheology modifier and a refractory aggregate exhibits non-thermoplastic behavior, and remains plastic and formable at temperatures in the range of 10 degrees Celsius to 180 degrees Celsius. The oleophilic rheology modifier may effectively bind with the solvent to create a gel-like structure with organic solvents with moderate to high polarity. A phyllosilicate clay that has been treated with a quaternary fatty acid amine may be used as the oleophilic rheology modifier.
A formulation containing polymer, resin and cement combined with aggregate can be used as a gunnable mix that is applied to a surface by being conveyed pneumatically in dry form to a nozzle, where water is added. Polymer in the gunnable mix enables it to adhere and bond to a surface, such as carbon brick, of a lining of a vessel used for the containment of molten metals. The formulation may be used, for example, to repair and protect blast furnace hearth linings.
The present invention concerns a torpedo ladle (1) for the transportation of molten metal, said torpedo ladle defining an inner cavity (3) and comprising: - an outer shell (1o) defining the outer surface of the torpedo ladle, and an inner liner (1i) comprising refractory bricks, defining the inner surface of the torpedo ladle, and - an opening (5) bringing in fluid communication the outer surface of the torpedo ladle with the inner surface thereof, said opening being located in the central portion of the torpedo ladle and facing upwards when the torpedo ladle is at its filling position, 6f; Characterized in that, the inner surface of the torpedo ladle comprises a corrugated portion (7) located opposite to, and in registry with the opening, the corrugation being characterized by crests (7c) and valleys (7v) extending parallel to the longitudinal axis, X1.
The present invention concerns a submerged nozzle (1) for casting steel comprising: • an inlet portion (1A), • an elongated portion (1B) extending along a first longitudinal axis, X1, from said inlet portion (1A), or adjacent thereto, to, • an outlet portion (1C), defined by an outer peripheral wall and comprising a first outlet front port (35) opening on said outer peripheral wall, • a pouring bore (50) extending parallel to the first longitudinal axis, X1, opening at said inlet orifice (18) and extending at least partly in the outlet portion (1C) of the nozzle whence it opens to the atmosphere at least through said first front port (35), which extends along front port direction, Y1, transverse to said first longitudinal axis, X1, from a front port inlet end (35i) joining the bore (50) to a front port outlet end (35o) opening at the outer peripheral wall of the outlet portion of the nozzle, • wherein a planar cut of the nozzle outlet portion (1C) along a plane normal to the first longitudinal axis, X1, passing through the front port inlet (35i) comprises: o the outline of the bore (50), defined by the bore perimeter (50P) and by the bore centroid (50x) of the area defined by said bore perimeter and, o the outline of the outer peripheral wall of the outlet portion of the nozzle defined by the wall perimeter (1P) and the wall centroid (1x) of the area defined by said wall perimeter, and o a first transverse axis, Y, passing by the bore centroid (50x) and extending along a direction parallel to the orthogonal projection of the front port direction, Y1, onto the plane of the cut, characterised in that, in said planar cut: • the bore centroid (50x) and wall centroid (1x) are distinct and separated by a distance, d≠ 0. • The segment extending along the first transverse axis, Y, from the bore centroid (50x), to the wall perimeter (1P) is longer than the segment extending from the wall centroid (1X) to the intersecting point between the first transverse axis, Y, and the wall perimeter (1P).
The present invention concerns a submerged nozzle (1) for casting steel comprising: ⋅ an inlet portion (1A), ⋅ an elongated portion (1B) extending along a first longitudinal axis (X1) from said inlet portion (1A), or adjacent thereto, to, ⋅ an outlet portion (1C), defined by an outer peripheral wall and comprising a first outlet front port (35) opening on said outer peripheral wall, ⋅ a pouring bore (50) extending parallel to the first longitudinal axis (X1) opening at said inlet orifice (18) and extending at least partly in the outlet portion (1C) of the nozzle whence it opens to the atmosphere at least through said first front port (35), which extends along a front port direction (Y1), transverse to said first longitudinal axis (X1) from a front port inlet end (35i) joining the bore (50) to a front port outlet end (35o) opening at the outer peripheral wall of the outlet portion of the nozzle, ⋅ wherein a planar cut of the nozzle outlet portion (1C) along a plane normal to the first direction (X1) comprises: ∘ the outline of the outer peripheral wall of the outlet portion (1C) of the nozzle defined by the wall perimeter (1P) and the wall centroid (1x) of the area defined by said wall perimeter ∘ a first transverse axis (Y) passing by the bore centroid (50x) and extending along a direction parallel to the orthogonal projection of the front port direction (Y1) onto the plane of the cut; characterised in that, ⋅ the nozzle comprises no front port extending along a direction opposite to the direction of the first front port (35) with respect to the longitudinal axis and belonging to the plane defined by the longitudinal axis (X1) and the front port direction (Y1) and in that, in said planar cut: ⋅ the distance (L1) from the wall centroid (1x) to the outer peripheral wall measured along the first transverse axis (Y) on the side of the front port (35) is greater than the same distance (L2) measured on the side opposite the front port (35); L1 > L2.
A composite that may be used in a side dam in a continuous twin roll caster system contains a working layer attached to a backing layer. The working layer contains hexagonal boron nitride and a second material containing least one metal nitride selected from the group consisting of silicon, aluminum and titanium nitride, and at least one stable metal oxide. The backing layer contains hexagonal boron nitride and a second material selected from the group consisting of SiAlON, silicates, nitrides, carbides, borides, oxides, mixed oxides, and combinations of more than one of these materials.
C04B 35/58 - Shaped ceramic products characterised by their compositionCeramic compositionsProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxides based on borides, nitrides or silicides
C04B 35/5833 - Shaped ceramic products characterised by their compositionCeramic compositionsProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxides based on borides, nitrides or silicides based on boron nitride based on hexagonal boron nitride
A purge plug containing a refractory material is configured to be inserted in the bottom of a ladle for introducing purging gas through a heat of molten metal in the ladle. The purge plug houses a retention chamber for holding the lead content of lead-containing molten steel alloys that leaches into, or infiltrates into, the purge plug. The purging gas supply tube is provided with a portion that protrudes into the retention chamber, thereby preventing the lead content of lead-containing molten steel alloys from entering and blocking the purging gas supply tube.
The present invention concerns a coating composition for applications at temperatures higher than 1200 °C comprising : (a) between 80.0 and 99.9 wt.% of unstabilized zirconia; and (b) between 0.1 and 5.0 wt.% of a liquid phase former which is solid at ambient temperature and either melts or reacts, or decomposes to form a liquid phase above a temperature not lower than 1000°C; wherein the wt.% are expressed in terms of total solid weight of the coating composition at room temperature. It also concerns a refractory element, preferably made of a carbon bonded refractory, comprising a coated surface comprising a first coating (1) of composition as defined above.
C23C 4/10 - Oxides, borides, carbides, nitrides or silicidesMixtures thereof
C04B 35/48 - Shaped ceramic products characterised by their compositionCeramic compositionsProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxides based on zirconium or hafnium oxides or zirconates or hafnates
B22D 41/22 - Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings
A formulation produces non-wetting surfaces that are resistant to mechanical damage and to corrosion and penetration by alloys at high temperatures. The non-wetting additive is a combination of (a) calcium hexaaluminate and (b) barium sulfate, strontium carbonate, strontium sulfate, barium carbonate, or combinations of these materials. The non-wetting additive may be used with aggregate, a matrix, and silica fume.
C04B 35/10 - Shaped ceramic products characterised by their compositionCeramic compositionsProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxides based on aluminium oxide
A replacement purge plug containing a refractory material is configured to be inserted in the bottom of a ladle for introducing purging gas through a heat of molten metal in a ladle. One or more geometrical features on the lateral surface of the purge plug facilitate the installation of the purge plug into a housing block that has been subjected to erosion.
1. The present invention concerns a gas purging plug (1) for blowing gas into a metallurgical vessel comprising: 2. (a) An elongated body (2) made of a first refractory material and extending from a first, inlet end (2a) to a second, outlet end (2b) over a distance, H, measured along a central longitudinal axis (X1) comprising, 3. (b) At least one gas flow path (3) fluidly connecting a gas inlet (3a) located at said first inlet end of said elongated body to a gas outlet (3b), located at the opposite second, outlet end; 4. (c) A final visual wear indicator (5) in the form of an elongated core extending from the first inlet end (2a) to a first distance, h1, measured along the central longitudinal axis (X1), which is less than the length, H, of the elongated body, h1 < H, said final visual indicator being made of a second refractory material of different visual appearance than the first refractory material at least at a temperature comprised between 800 and 1500° C, Characterized in that, it further comprises an intermediate visual wear indicator (4), partially embedded in the final visual wear indicator (5) and extending from an initial distance, h0, to a final distance, h2, from the first, inlet end (2a), wherein h0 < h1 < h2 < H, and wherein the intermediate visual wear indicator (4) is made of a third material, permitting to yield a different visual appearance than the first and second refractory materials at least at a temperature comprised between 800 and 1500° C.
C22B 9/05 - Refining by treating with gases, e.g. gas flushing
17.
NOZZLE ASSEMBLY COMPRISING FIRST AND SECOND ELEMENTS BEING COUPLED TO ONE|ANOTHER IN A SLIDING TRANSLATION RELATIONSHIP AND A SEALING MEMBER MADE OF|THERMALLY INTUMESCENT MATERIAL, REFRACTORY ELEMENT.METHOD FOR PRODUCING A|REFRACTORY ELEMENT, METHOD FOR COUPLING TWO REFRACTORY ELEMENTS
The present invention concerns a nozzle assembly (20, 30) for a metal casting apparatus selected from a sliding gate and a tube exchange device, said nozzle assembly comprising: a first refractory element (1 ) comprising a first coupling surface (1 a) which includes a first bore aperture, and a second refractory element (11 ) comprising a second coupling surface (1 1a), which includes a second bore aperture, the first and second elements being coupled to one another in a sliding translation relationship through their respective first and second coupling surfaces such that the first and second bore apertures can be brought into and out of registry to define, when in registry, a continuous bore (3, 13) for discharging molten metal from a molten metal inlet (13a) to a molten metal outlet (3b) of said nozzle assembly, a sealing member (2) provided between the first and second coupling surfaces of the first and second elements, characterized in that, the sealing member (2) comprises a thermally intumescent material.
B22D 41/08 - Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like for bottom pouring
B22D 41/22 - Closures sliding-gate type, i.e. having a fixed plate and a movable plate in sliding contact with each other for selective registry of their openings
B22D 41/32 - Manufacturing or repairing thereof characterised by the materials used therefor
B22D 41/36 - Treating the plates, e.g. lubricating, heating
The present invention concerns a device (1), for example a gas purging plug, for blowing gas into a metallurgical vessel comprising (a) a body (2) extending along a central axis (X1) comprising, (b) at least one gas flow channel (3) fluidly connecting a gas inlet (3a) located at one end of said body to a gas outlet (3b), located at the opposite end along said axis, said channel (3) being in the shape of a slit defined by a first and second opposed surfaces. The device (1) according to the invention is characterized in that, (c) the at least one gas channel (3) comprises a series of continuous concave bridges (4) connecting the first and second opposing surfaces defining the channel, with their concave side (4a) oriented towards the gas outlet (3b), wherein said concave bridges (4) are disposed in a staggered arrangement, such that any first shortest line running from the gas outlet (3b) to the gas inlet (3a) of the channel necessarily intercepts the concave side (4a) of at least one first bridge (41). The device (1) according to the invention permits to prevent clogging of device by infiltrated molten metal or slag.
A metallurgical ladle, and more particularly the bottom of the ladle or a ladle block in the bottom of the ladle, have an outlet through which the molten metal can drain. The ladle bottom contains an open-end channel bounded by at least one wall with a major dimension perpendicular to a line joining the center of the outlet entrance to the center of the wall. In selected configurations, opposing faces of the walls bounding the open-end channel are convex in the horizontal plane and concave in the horizontal plane, respectively.
A tundish impact pad formed from refractory material comprises a base having an impact surface which, in use, faces upwardly against a stream of molten metal entering a tundish, and a wall extending upwardly from the base around at least a part of the periphery of the impact surface. The wall has at least one latitudinal portion. An inwardly-extending feature protrudes from the latitudinal wall. The inwardly-extending feature inhibits flow exiting the impact pad from passing over the center of the latitudinal portion of the wall.
A refractory element is configured to prevent or limit steel reoxidation in a steel casting process. The refractory element contains a base surrounded by a periphery in a specified geometrical arrangement. The refractory element is constituted of a base surrounded by a periphery in a specified geometrical arrangement.
A pour tube for casting molten metal is adapted to reduce turbulence and mold disturbances, thereby producing a more stable, uniform outflow. The pour tube includes a bore having a body in communication with an enlarged outlet portion. Exit ports in communication with the outlet portion have an offset design in which at least one wall of the exit port is tangent to a circle having a larger radius than the body of the bore.
A method and apparatus for conveying dry material for a gunning application make use of a rotary air lock in communication with a material source and an inductor. The material is supplied through the rotary air lock to the inductor under a pressure greater than the outlet pressure of the inductor.
A cement plant refractory anchor (10) comprising a body formed of stainless steel, wherein external surfaces of said body have a surface diffusion coating of an iron aluminide phase formed by a high temperature pack cementation process.
A sinker is described for use in hot-dip coating of moving lengths of wire in a molten metal bath. The sinker guides the wire through the bath with little turbulence or vibration, and with reduced friction and contact with the wire. The sinker includes a frame supporting a plurality of rolls along an arcuate periphery. The rolls may be grooved and may comprise carbon-impregnated fused silica. The grooves control the gap between wires and allow for proper coating of the wire. The rolls are spaced apart so that dross does not collect on the sinker. The number, spacing and diameter of the rolls depend on the type of wire being coated and the tension on the wire.
B05C 3/12 - Apparatus in which the work is brought into contact with a bulk quantity of liquid or other fluent material the work being immersed in the liquid or other fluent material for treating work of indefinite length
B05D 1/18 - Processes for applying liquids or other fluent materials performed by dipping
26.
CAST BODIES, CASTABLE COMPOSITIONS, AND METHODS FOR THEIR PRODUCTION
A low-water-content castable composition produces cast products with an increased modulus of rupture, an increased cold crushing strength, and decreased porosity. The composition employs closed fractions of constituent particles with specified populations and specified gaps in the particle size distribution to produce these properties. The composition is suitable for refractory applications.
An improved pulling roll used in the manufacture of sheet glass. The pulling roll of the invention makes use of two or more materials in a roll configuration that provides a pulling flat containing a material optimized for glass contact, and remaining portions optimized for resistance to thermal and physical stress. The pulling flat contains a sintered compressed product having a chemical bond between a colloidal component and a fiber component.
The present invention describes a roll for use in glass manufacture, especially non- dusting TFT glass. The roll may include a hollow fused silica cylinder. End caps are mechanically fixed to the roll. Pulling flats are fixed in place by inner and outer end plates. A compression fitting secures at least the outer end plate to the roll. The roll may be reinforced with an internal metal rod that is secured to the shaft by a plurality of supports. The supports accommodate differences in thermal expansion.
A crack resistant valve plate for use in a slide gate valve is configured so that stresses induced by clamping and/or driving the plate are concentrated toward the bore to counteract the expansion at the bore. The plate has a working end and a shutoff end; the bore is placed closer to the working end. The working end and shutoff end both contain an arc having its center within the bore.
F16K 1/16 - Lift valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure members
30.
CRUCIBLE AND METHOD OF FILLING A CRUCIBLE FOR MELTING A NON-FERROUS PRODUCT
The invention relates to a one-piece crucible (10) for melting a non-ferrous product, of the type comprising a bottom (12) bounded by an approximately plane internal surface (16) of the crucible, said surface being surrounded by a curved internal surface (18) provided with marking means (20) materializing the base of an imaginary filling zone (22) for the product in the solid state in the crucible, in which the marking means (20, 20') separate the plane surface (16) into a central first part (24) and a peripheral second part (26). The invention also relates to a method of filling a crucible for melting a non-ferrous product, during which the product in the solid state is placed in an imaginary filling zone (22) of the crucible. Marking means (20) are used to materialize a base of the imaginary filling zone for the product in the solid state in the crucible and the product is placed according to these marking means in such a way that the product can expand during melting of the non-ferrous product without coming into contact with the curved internal surface of the crucible.
C30B 11/00 - Single-crystal-growth by normal freezing or freezing under temperature gradient, e.g. Bridgman- Stockbarger method
C30B 15/10 - Crucibles or containers for supporting the melt
C30B 35/00 - Apparatus not otherwise provided for, specially adapted for the growth, production or after-treatment of single crystals or of a homogeneous polycrystalline material with defined structure
The invention relates to an electric arc furnace roof top (10) comprising a central portion (14) and a peripheral portion (16) surrounding the central portion (14), each of these portions having an inner surface (24,26) suitable for facing the furnace inner space (I). The inner surfaces of the peripheral and central portions form together a step (d) so as to raise the inner surface (24) of the central portion (14) in relation to the inner surface (26) of the peripheral portion (16) with respect to the furnace inner space.
The generally parallelepiped crucible (12) has a bottom wall (14) and side walls (16). The packaging (13) comprises a body (20) with side walls (22) substantially parallel to a common axis termed the reference axis (X). The body (20) is designed to enclose the side walls (16) of the crucible (12) so that the walls (22) of the body (20) fit those of the crucible (12). The body (20) comprises means (28) for separating the body (20) and the crucible (12). The separation means preferably comprise means (28) for gripping the body (20) so as to move it in a direction substantially parallel to the reference axis (X) and/or a precut line in at least one side wall (22) of the body (20) of the packaging.
B65D 5/12 - Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper by folding or erecting a single blank to form a tubular body with or without subsequent folding operations, or the addition of separate elements, to close the ends of the body with end closures formed separately from tubular body
B65D 5/16 - Rigid or semi-rigid containers of polygonal cross-section, e.g. boxes, cartons or trays, formed by folding or erecting one or more blanks made of paper by folding or erecting a single blank to form a tubular body with or without subsequent folding operations, or the addition of separate elements, to close the ends of the body the tubular body being formed with an aperture or removable portion arranged to allow removal or insertion of contents through one or more sides
The present invention describes a cement free refractory mixture. The mixture comprises a pH buffer and a component containing a metal or fumed silica. Water may impart good flow characteristics to the mixture and can produce an effective low temperature cure. At elevated temperatures, an article formed using this mixture has superior refractory and physical properties.
The present invention relates to refractory articles in general having improved surface properties. The objective of the invention is to propose an improvement of the refractory articles comprised of a fused silica matrix which will overcome the some of the defects while keeping the excellent known properties of the fused silica matrix. This objective is reached when a sintered ceramic phase is present in the porosity of at least a portion of at least a surface of the matrix. The present invention also relates to a process for producing such an article.
C04B 35/14 - Shaped ceramic products characterised by their compositionCeramic compositionsProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxides based on silica
C04B 35/18 - Shaped ceramic products characterised by their compositionCeramic compositionsProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxides based on silicates other than clay rich in aluminium oxide
C04B 35/622 - Forming processesProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products
The present invention relates to a method of forming a ceramic mold. The method comprises impregnating ceramic cloth with slurry, wrapping the cloth around a form, and allowing the slurry to harden. The method further comprises removing the form.
C04B 35/00 - Shaped ceramic products characterised by their compositionCeramic compositionsProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products
C04B 35/622 - Forming processesProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products
B22C 1/16 - Compositions of refractory mould or core materialsGrain structures thereofChemical or physical features in the formation or manufacture of moulds characterised by the use of binding agentsMixtures of binding agents
The present invention relates to a ceramic filter suitable for molten metal filtration comprising a ceramic powder bonded by a network of graphitized carbon, wherein the ceramic filter is coated by a glaze.
The invention relates to a nozzle (1) adapted for the transfer of molten metal from an upper vessel to a lower vessel comprising a nozzle body having a gas discharge element and a bore (3) connecting the gas discharge element (2) to a gas inlet (4), the bore (3) defining a gas passageway. According to the invention, the material constituting the gas discharge element (2) is constituted of a material that will not produce carbon monoxide at the temperature of use. Advantageously, the walls of the gas passageway are provided with a layer (5) of a material which will not produce carbon monoxide at the temperature of use. The nozzle of the invention does not contaminate the gas passing therethrough.
The invention relates to a crucible for the treatment of molten silicon comprising a basic body with a bottom surface and lateral walls defining an inner volume. According to the invention, the basic body comprises at least 65% by weight of silicon carbide, from 12 to 30 % by weight of a constituent selected from silicon oxide or nitride. Moreover, the basic body comprises at least one silicon oxide and/or nitride coating, at least on the surfaces defining the inner volume of the crucible contrarily to the state of the art crucibles, such a crucible can be used several times without any visible degradation of its physical integrity.
The invention relates to a crucible for the crystallization of silicon and to the preparation and application of release coatings for crucibles used in the handling of molten materials that are solidified in the crucible and then removed as ingots, and more particularly to release coatings for crucibles used in the solidification of polycrystalline silicon. The objective of the inventor was to provide a crucible comprising a silicon nitride coating which is faster and cheaper to produce and which is stronger with an improved adherence to the walls. It has now been found that these problems can be solved with a crucible for the crystallization of silicon comprising a) a base body comprising a bottom surface and side walls defining an inner volume; b) a protective coating comprises 80 to 95 wt. % of silicon nitride and 5 to 20 wt. of a low temperature mineral binder, the total oxygen content ranging from 5 to 15 % by weight.
C30B 11/00 - Single-crystal-growth by normal freezing or freezing under temperature gradient, e.g. Bridgman- Stockbarger method
C04B 35/584 - Shaped ceramic products characterised by their compositionCeramic compositionsProcessing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxides based on borides, nitrides or silicides based on silicon nitride
40.
FILTER DEVICE FOR MOLTEN METAL FILTRATION AND METHOD FOR PRODUCING SUCH FILTERS
The present invention relates to a ceramic filter device for molten metal filtration comprising a major ceramic phase and a minor carbon phase bonded by phosphate bond, a method for producing such filter devices, and the use of such filter devices for the filtration of molten steel.
The present invention relates to the continuous casting of steel and particularly to the problem of steel reoxidation. In particular, the invention relates to a tundish (50) comprising an assembly comprising a nozzle (1) and a surrounding refractory element (4) preventing or limiting steel reoxidation. According to other of its aspects, the invention also relates to such a surrounding refractory element and to a continuous steel casting process.
The invention relates to a crucible for the crystallization of silicon and to the preparation and application of release coatings for crucibles used in the handling of molten materials that are solidified in the crucible and then removed as ingots, and more particularly to release coatings for crucibles used in the solidification of polycrystalline silicon. The objective of the inventor was to provide a crucible which does not require the preparation of a very thick coating at the end user facilities, which is faster and cheaper to produce and which presents an improved release effect and which allows the production of silicon ingot without cracks. It has now been found that these problems can be solved with a crucible for the crystallization of silicon comprising a) A base body comprising a bottom surface and side walls defining an inner volume; b) A substrate layer comprising 80 to 100 wt. % of silicon nitride at the surface of the side walls facing the inner volume c) an intermediate layer comprising 50 to 100 wt. % of silica on the top of the substrate layer; and d) A surface layer comprising 50 to 100 wt. % of silicon nitride, up to 50 wt. % of silicon dioxide and up to 20 wt % of silicon on the top of the intermediate layer.
C30B 11/00 - Single-crystal-growth by normal freezing or freezing under temperature gradient, e.g. Bridgman- Stockbarger method
C30B 15/10 - Crucibles or containers for supporting the melt
C30B 35/00 - Apparatus not otherwise provided for, specially adapted for the growth, production or after-treatment of single crystals or of a homogeneous polycrystalline material with defined structure
43.
REFRACTORY WELL BLOCK WITH SLEEVE AND PROCESS FOR MAKING THE SAME
The present invention relates to a well block for use in a metallurgical vessel. The well block (1) is designed for receiving a nozzle (5) or a porous plug. The well block comprises a pressed carbon bonded sleeve (2) for improved wear resistance and easier nozzle repair. The present invention also relates to a process for making a well block according to the invention.
The present invention relates to conveyor rolls used in high temperature applications, and more particularly concerns an improved end cap assembly for such rolls. According to the invention, the conveyor roll (1) comprises a) a ceramic spool (2), b) at each end (21 ,22) of the ceramic spool (2), an end cap (4) comprising a metal ferrule (41) and having a certain internal circumference adapted to fit over an end (21) of the ceramic spool; and c) interposed between each end (21 ,22) of the ceramic spool (2) and the end cap (4) a tolerance ring (3) of resilient metal having a plurality of circumferentially arranged corrugations. This conveyor roll can resist temporary overheat or blockage without damages.
B65G 39/02 - Adaptations of individual rollers and supports therefor
F16D 1/08 - Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hubCouplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with hub and longitudinal key
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