Abstract

2 in a wire's core (1).

IPC Classes  ?

• H01B 12/06 - Films or wires on bases or cores
• B22F 3/04 - Compacting only by applying fluid pressure
• B22F 7/04 - Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting of composite layers with one or more layers not made from powder, e.g. made from solid metal
• C22C 32/00 - Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
• H01B 1/02 - Conductors or conductive bodies characterised by the conductive materialsSelection of materials as conductors mainly consisting of metals or alloys
• H01B 12/10 - Multi-filaments embedded in normal conductors

Abstract

The solution relates to a method of controlled alloying of intermetallic γ-TiAl alloys with carbon in a range from 0.09 to 0.29 wt. %. The intermetallic γ-TiAl alloy with an oxygen content of 0.04 wt. % is melted in 100 cm3crucible prepared from isostatically pressed graphite with a density of 1.8 g/cm3, open porosity lower than 2% and an average grain size of graphite grains of less than 40 μm. The melting of γ-TiAl alloys is carried out in a vacuum induction furnace using medium frequency induction heating with a medium frequency inductor with an output power from 20 to 30 kW and a frequency ranging from 20 to 30 kHz using an argon protective atmosphere with a purity at least of 99.995%. The vacuum chamber of the induction furnace is only partially filled with argon to maintain a vacuum pressure ranging from 1 to 10 kPa. The heating of γ-TiAl alloys to the melting temperature is ensured by gradually increasing the inductor output power while maintaining the heating rate from 90 to 100°C/min. The maximum total time from the start of the melting (first hint of melt) to the selected superheating temperature is 60 s, which corresponds to the alloy heating rate in a range from 150 to 200°C/min depending on the selected superheating temperature of the melt. The superheating temperature of the melt is in the range from 1650 to 1700°C. The holding time of the melt at the superheating temperature is in a range from 20 to 90 s depending on the required carbon content of the final casting.

IPC Classes  ?

• C21D 1/773 - Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material under reduced pressure or vacuum
• C22C 1/02 - Making non-ferrous alloys by melting
• C22C 1/03 - Making non-ferrous alloys by melting using master alloys
• C22C 1/10 - Alloys containing non-metals
• C22C 14/00 - Alloys based on titanium
• B22D 13/00 - Centrifugal castingCasting by using centrifugal force
• C22B 9/04 - Refining by applying a vacuum
• H05B 6/26 - Crucible furnaces using vacuum or particular gas atmosphere

Abstract

2. The matrix, that is, the filling (2) can be copper or silver or their alloys.

IPC Classes  ?

• B32B 3/00 - Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shapeLayered products comprising a layer having particular features of form
• G21B 1/13 - First wallBlanketDivertor
• B62K 15/00 - Collapsible or foldable cycles
• B62K 17/00 - Cycles not otherwise provided for
• B32B 15/01 - Layered products essentially comprising metal all layers being exclusively metallic
• B32B 15/04 - Layered products essentially comprising metal comprising metal as the main or only constituent of a layer, next to another layer of a specific substance
• B32B 5/04 - Layered products characterised by the non-homogeneity or physical structure of a layer characterised by structural features of a layer comprising fibres or filaments characterised by a layer being specifically extensible by reason of its structure or arrangement

Abstract

The sheath (3) is a material, which consists of aluminium (Al) matrix, in which nanometric aluminium oxide particles (Al203) are homogenously dispersed, wherein the content of Al2O3 is 0.25 to 5 vol.% and the balance is Al. It is preferred that Al2O3 originates from the surface layer present on Al powder used as feedstock material for consolidation. The superconductor based on magnesium diboride (MgB2) core (1) is fabricated by powder-in-tube or internal magnesium diffusion to boron technology, while the tube is the Al+Al2O3 composite, which is a product of powder metallurgy. A loose Al powder is pressed by cold isostatic pressing, and then the powder billet is degassed at elevated temperature and under vacuum, and then is hot extruded into a tube. A thin diffusion barrier (2) tube filled up with a mixture of Mg and B powders or Mg wire surrounded with B powder is placed into the Al+Al2O3 composite tube under inert gas or vacuum. Such composite unit is cold worked into a thin wire and then annealed at 625-655 °C for 8-90 min, what results in a formation superconducting MgB2 in a wire's core (1).

IPC Classes  ?

• H01L 39/14 - Permanent superconductor devices
• H01L 39/24 - Processes or apparatus specially adapted for the manufacture or treatment of devices provided for in group or of parts thereof
• C22C 32/00 - Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ

Abstract

Foamable semifinished product (1) in the form of granules produced from the metal alloy and the foam agent is inserted into the cavity of the closable mould (2) and the liquid (3) with the density that is higher than the apparent (or bulk) density of the resulting foam is led to it. The liquid has a temperature which is higher than the temperature of the melting of the metal alloy; the transfer of the heat to the particles of the foamable semifinished product (1) takes place; it subsequently expands, whereby it is supported by the liquid (3). During the expansion at least part of the liquid (3) is pushed by the expansion itself out of the mould (2) through the opening. The liquid (3) allows the regulation of the pressure of the environment of the foam agent, too, which helps to set exactly the moment of expansion. The metal melt can be advantageously used as liquid (3). The melt can partially remain in the mould (2) so the hybrid structure of the component is created. The new method makes the foaming significantly quicker, it secures the homogeneity of the metal foam, simplifies the moulds and diminishes the energy demands for the whole process.

IPC Classes  ?

• B22D 25/00 - Special casting characterised by the nature of the product
• B22F 3/11 - Making porous workpieces or articles
• B22F 7/08 - Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting of composite workpieces or articles from parts, e.g. to form tipped tools with one or more parts not made from powder
• C22C 1/04 - Making non-ferrous alloys by powder metallurgy
• C22C 21/02 - Alloys based on aluminium with silicon as the next major constituent
• C22C 21/00 - Alloys based on aluminium
• C22C 21/06 - Alloys based on aluminium with magnesium as the next major constituent
• B22D 23/06 - Melting-down metal, e.g. metal particles, in the mould
• C22C 21/08 - Alloys based on aluminium with magnesium as the next major constituent with silicon

Abstract

Composite for the transfer of the heat between the hot and cooled surface, whereby the composite is resistant to high temperatures, is composed of at least two components, whereby one of the components is produced by longitudinal segments (1) with the melting temperature that is higher than 1300°C and which are separated from each other by the filling (2) with the higher heat conductivity and thermal expansivity, which is in the direct contact with the cooling medium in the channel (3). Both components are in the direct contact with the hot environment surrounding the composite, whereby the overall surface formed by the segments (1) is 50 to 95% of the overall hot surface of the composite. The longitudinal axis of the segment (1) is primarily oriented in the direction of the shortest line connecting the hot surface with the cooled surface of the composite with the allowed deviation of 45° at maximum, whereby in the direction from the hot to the cooled surface it can cross one boundary between the components at maximum. The material for the segments can be tungsten, preferably tungsten with the admixtures of oxides La2O3 and/or Y2O3 and/or CeO2 and/or ThO2 and/or ZrO2. The matrix, that is, the filling (2) can be copper or silver or their alloys.

IPC Classes  ?

• G21B 1/13 - First wallBlanketDivertor

Abstract

Foamable semifinished product (1) in the form of granules produced from the metal alloy and the foam agent is inserted into the cavity of the closable mould (2) and the liquid (3) with the density that is higher than the apparent (or bulk) density of the resulting foam is led to it. The liquid has a temperature which is higher than the temperature of the melting of the metal alloy; the transfer of the heat to the particles of the foamable semifinished product (1) takes place; it subsequently expands, whereby it is supported by the liquid (3). During the expansion at least part of the liquid (3) is pushed by the expansion itself out of the mould (2) through the opening. The liquid (3) allows the regulation of the pressure of the environment of the foam agent, too, which helps to set exactly the moment of expansion. The metal melt can be advantageously used as liquid (3). The melt can partially remain in the mould (2) so the hybrid strucutre of the component is created. The new method makes the foaming significantly quicker, it secures the homogenity of the metal foam, simplifies the moulds and diminishes the energy demands for the whole process.

IPC Classes  ?

• B22D 25/00 - Special casting characterised by the nature of the product
• C22C 1/08 - Alloys with open or closed pores
• C22C 21/00 - Alloys based on aluminium

Abstract

Foamable semifinished product (1) in the form of granules produced from the metal alloy and the foam agent is inserted into the cavity of the closable mould (2) and the liquid (3) with the density that is higher than the apparent (or bulk) density of the resulting foam is led to it. The liquid has a temperature which is higher than the temperature of the melting of the metal alloy; the transfer of the heat to the particles of the foamable semifinished product (1) takes place; it subsequently expands, whereby it is supported by the liquid (3). During the expansion at least part of the liquid (3) is pushed by the expansion itself out of the mould (2) through the opening. The liquid (3) allows the regulation of the pressure of the environment of the foam agent, too, which helps to set exactly the moment of expansion. The metal melt can be advantageously used as liquid (3). The melt can partially remain in the mould (2) so the hybrid strucutre of the component is created. The new method makes the foaming significantly quicker, it secures the homogenity of the metal foam, simplifies the moulds and diminishes the energy demands for the whole process.

IPC Classes  ?

• B22D 25/00 - Special casting characterised by the nature of the product
• C22C 1/08 - Alloys with open or closed pores
• C22C 21/00 - Alloys based on aluminium

Abstract

The composite material comprises a biocompatible titanium (Ti) or biocompatible Ti alloy, and biodegradable component, which is intended to at least partially desorb in vivo in contact with human tissue and which has an Young's elastic modulus lower than used Ti or Ti alloy. The material is prepared from a mixture of the particles of Ti or Ti alloy and the particles of the biodegradable component, wherein the biodegradable component, in particular magnesium (Mg), is dispersed throughout a volume of the material and occupies 2 to 20 volumic % in the material. The biodegradable component is present in a bearing Ti or Ti alloy structure in the form of filaments oriented along an extrusion axis. A manufacturing process comprises fabrication of powders, mechanical blending of powders to a homogeneous mixture and a subsequent extrusion at a temperature from 300 °C to 640 °C. The components are consolidated to a common mass, wherein during a consolidation the biodegradable component is formed into filaments oriented along an extrusion direction. Prior heated and extrusion the powder mixture may be precompacted in order to reach acceptable handling strength and cohesion.

IPC Classes  ?

• A61L 27/06 - Titanium or titanium alloys
• A61L 27/42 - Composite materials, i.e. layered or containing one material dispersed in a matrix of the same or different material having an inorganic matrix
• A61L 27/58 - Materials at least partially resorbable by the body
• A61L 31/02 - Inorganic materials
• A61L 31/12 - Composite materials, i.e. layered or containing one material dispersed in a matrix of the same or different material
• A61L 31/14 - Materials characterised by their function or physical properties
• A61K 6/04 - Use of metals or alloys