Provided is a roasting apparatus in which, when a powder serving as a substance being roasted is roasted, lumps do not readily form and uneven roasting does not readily occur. The roasting apparatus 10 comprises a bottomed powder container 20 in which a powder that is a substance being roasted is accommodated, heaters 12A, 12B for heating the substance being roasted, and a container-moving mechanism 40 that causes the powder container 20 to move on a surface, a straightening vane 21 that protrudes inward being provided to the inner surface of the powder container 20.
A23L 5/00 - Preparation or treatment of foods or foodstuffs, in general; Food or foodstuffs obtained thereby; Materials therefor
A23G 3/36 - Sweetmeats, confectionery or marzipan; Processes for the preparation thereof characterised by the composition
A23K 10/20 - Animal feeding-stuffs from material of animal origin
A23K 40/00 - Shaping or working-up of animal feeding-stuffs
A23L 5/10 - General methods of cooking foods, e.g. by roasting or frying
A23L 7/109 - Types of pasta, e.g. macaroni or noodles
A23L 33/10 - Modifying nutritive qualities of foods; Dietetic products; Preparation or treatment thereof using additives
A61K 8/98 - Cosmetics or similar toiletry preparations characterised by the composition containing materials, or derivatives thereof, of undetermined constitution of animal origin
A61Q 1/00 - Make-up preparations; Body powders; Preparations for removing make-up
Provided is a sintered compact obtained by sintering a powder material that includes iron powder including chromium, copper powder, nickel powder, and carbon powder.
Provided is a hard particle in which Cr and W, that are quickly diffused in Mo, are present at the same time as Ni and Mn. Specifically, the hard particle contains Cr: 5% by mass to 20% by mass, W: 2% by mass to 19% by mass, Mo: 25% by mass to 40% by mass, Ni: 10% by mass to 22% by mass, Mn: 10% by mass or less, C: 2.0% by mass or less, Si: 2.0% by mass or less, and a remainder: Fe and unavoidable impurities.
C22C 33/02 - Making ferrous alloys by powder metallurgy
B22F 3/16 - Both compacting and sintering in successive or repeated steps
C22C 30/00 - Alloys containing less than 50% by weight of each constituent
F16K 25/00 - VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING - Details relating to contact between valve members and seats
C22C 38/16 - Ferrous alloys, e.g. steel alloys containing copper
B22F 9/08 - Making metallic powder or suspensions thereof; Apparatus or devices specially adapted therefor using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
5.
Brake lining for railway vehicle, disc brake system for railway vehicle including same, and sintered friction material to be used for brake lining for railway vehicle
There is provided a brake lining for a railway vehicle that can reduce brake squeal in braking. A brake lining for a railway vehicle is used for a disc brake system of a railway vehicle. This brake lining includes a base plate, a sintered friction material, and a friction material supporting mechanism. The friction material supporting mechanism is disposed between the base plate and the sintered friction material and supports the sintered friction material in such a manner that the sintered friction material can move with respect to the base plate. The sintered friction material has a Young's modulus of 35.0 GPa or more.
B61H 5/00 - Applications or arrangements of brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
F16D 55/226 - Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads in which the common actuating member is moved axially
F16D 65/097 - Resilient means interposed between pads and supporting members
A current-collecting sliding material which is obtained by infiltrating a metal material containing copper and titanium into a carbon base material that is configured to contain a carbon composite fiber that is composed of carbon fibers and a matrix.
D01F 9/12 - Carbon filaments; Apparatus specially adapted for the manufacture thereof
C04B 35/52 - Shaped ceramic products characterised by their composition; Ceramic compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxides based on carbon, e.g. graphite
A sintered friction material is formed by pressure sintering mixed powder at 800° C. or above, the mixed powder consisting of, in mass %, Cu and/or Cu alloy: 40.0 to 80.0%, Ni: 0% or more and less than 5.0%, Sn: 0 to 10.0%, Zn: 0 to 10.0%, VC: 0.5 to 5.0%, Fe and/or Fe alloy: 2.0 to 40.0%, lubricant: 5.0 to 30.0%, metal oxide and/or metal nitride: 1.5 to 30.0%, and the balance being impurity.
There is provided a sintered friction material for railway vehicles that has excellent frictional properties and wear resistance even in a high speed range of 280 km/hour or more. The sintered friction material for railway vehicles is a green compact sintered material containing, in mass %, Cu: 50.0 to 75.0%, graphite: 5.0 to 15.0%, one or more selected from the group consisting of magnesia, zircon sand, silica, zirconia, mullite, and silicon nitride: 1.5 to 15.0%, one or more selected from the group consisting of W and Mo: 3.0 to 30.0%, and one or more selected from the group consisting of ferrochromium, ferrotungsten, ferromolybdenum, and stainless steel: 2.0 to 20.0%, with the balance being impurities.
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
C22C 1/05 - Mixtures of metal powder with non-metallic powder
BRAKE LINING FOR RAILROAD CARS, DISC BRAKE SYSTEM FOR RAILROAD CARS USING SAME, AND SINTERED FRICTION MATERIAL TO BE USED FOR BRAKE LINING FOR RAILROAD CARS
Provided is a brake lining for railroad cars, which is capable of suppressing brake squeal during braking. A brake lining (10) for railroad cars according to the present invention is used in a disc brake system of a railroad car. This brake lining (10) is provided with a substrate (40), a sintered friction material (20) and a friction material supporting mechanism (30). The friction material supporting mechanism (30) is arranged between the substrate (40) and the sintered friction material (20), and supports the sintered friction material (20) so that the sintered friction material is movable with respect to the substrate. The sintered friction material (20) has a Young's modulus of 35.0 GPa or more.
This brake lining includes: a plurality of friction members which are arranged to be spaced from each other, each of the friction members having a front surface that is to face a sliding surface of a brake disk; a back board fastened to a back surface of each of the friction members; a base plate that supports each of the friction members at a region including a center portion of each friction member; and an elastic member disposed between the base plate and the back board, on a back surface side of each friction member. Two friction members that are adjacent to each other are taken as a pair, and the back board is fastened to each of the pairs of friction members. In each pair of friction members, the two friction members are arranged along the circumferential direction of the brake disk.
F16D 55/02 - Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members
This sintered friction material is formed by sintering a mixed powder under pressure at 800°C or higher, said mixed powder containing, in mass%, 40.0-80.0% of Cu and/or a Cu alloy, 0% or more but less than 5.0% of Ni, 0-10.0% of Sn, 0-10.0% of Zn, 0.5-5.0% of VC, 2.0-40.0% of Fe and/or an Fe alloy, 5.0-30.0% of a lubricant and 1.5-30.0% of a metal oxide and/or a metal nitride, with the balance being made up of impurities.
B22F 7/00 - Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting
C22C 1/04 - Making non-ferrous alloys by powder metallurgy
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
12.
SINTERED FRICTION MATERIAL FOR RAILWAY VEHICLES, AND METHOD FOR PRODUCING SAME
Provided is a sintered friction material for railway vehicles, which exhibits excellent frictional properties and abrasion resistance even in high speed ranges of 280 km/hour or more. This sintered friction material for railway vehicles is a green compact sintered material which contains, in terms of mass%, 50.0-75.0% of Cu, 5.0-15.0% of graphite, 1.5-15.0% of one or more types selected from the group consisting of magnesia, zircon sand, silica, zirconia, mullite and silicon nitride, 3.0-30.0% of 1 or more types selected from the group consisting of W and Mo, and 2.0-20.0% of one or more types selected from the group consisting of ferrochrome, ferrotungsten, ferromolybdenum and stainless steel, with the remainder comprising impurities.
The disclosed brake lining includes first and second friction member blocks (21, 22), a fastening member (31), a spring member (32) disposed on the fastening member (31), and a substrate (41). The first friction member block (21), which contains friction members (20), is elastically fastened to the substrate (41) by two fastening members (31) passing through the spring member (32) and a first back plate (21a). The two fastening members (31) are disposed circumferentially about an axle. The second friction member block (22), which contains friction members (20), is elastically fastened to the substrate (41) by three fastening members (31) passing through the spring member (32) and a second back plate (22a). The two fastening members (31), which are situated on either side of the second friction member block (22), are disposed circumferentially about an axle.
Mixed powder that contains first hard particles, second hard particles, graphite particles, and iron particles is used to manufacture a sintered alloy. The first hard particle is a Fe—Mo—Cr—Mn based alloy particle, the second hard particle is a Fe—Mo—Si based alloy particle. The mixed powder contains 5 to 50 mass % of the first hard particles, 1 to 8 mass % of the second hard particles, and 0.5 to 1.0 mass % of the graphite particles when total mass of the first hard particles, the second hard particles, the graphite particles, and the iron particles is set as 100 mass %.
C22C 1/05 - Mixtures of metal powder with non-metallic powder
C22C 1/04 - Making non-ferrous alloys by powder metallurgy
C22C 29/02 - Alloys based on carbides, oxides, borides, nitrides or silicides, e.g. cermets, or other metal compounds, e. g. oxynitrides, sulfides based on carbides or carbonitrides
A sintered alloy is produced from mixed powder containing first hard particles, second hard particles, graphite particles, and iron particles. The first hard particles are Fe—Mo—Ni—Co—Mn—Si—C-based alloy particles, the second hard particles are Fe—Mo—Si-based alloy particles, the mixed powder contains 5 to 50 mass % of the first hard particles, 1 to 8 mass % of the second hard particles, and 0.5 to 1.5 mass % of the graphite particles, when total mass of the first hard particles, the second hard particles, the graphite particles, and the iron particles is set as 100 mass %.
This brake lining is provided with: multiple friction members which are arranged with the front surface facing the sliding surface of the brake disc and are arranged spaced apart from each other by gaps; back plates which are fixed to the back surface of the friction members; a base plate which supports the friction members in a region that includes the center of each friction member; and elastic members mounted interposed between the base plate and the back plates on the back of the friction members. Defining two mutually adjacent friction members as a pair, the back plates attached to a pair of friction members are a single body. In the friction members of any pair, the two friction members are arranged along the circumferential direction of the brake disc. This brake lining makes it possible to easily reduce braking noise.
This brake lining (2) is pressed against the sliding surface of a brake disc fixed to a wheel or an axis of a railway rolling stock. This brake lining (2) is provided with: multiple friction members (3) which are arranged with the front surface facing the sliding surface of the brake disc and are spaced apart from each other by gaps; back plates (4) which are fixed to the back surface of the friction members (3); and a base plate (6) which supports the friction members (3) in a region that includes the center of each friction member (3), wherein a spring member is mounted interposed between the base plate (6) and the back plate (4) on the back of each friction member (3). Defining two mutually adjacent friction members (3) as a pair, the back plates (4) attached to a pair of friction members (3) are a single body, and the width of the back plate (4) at the gap between the friction members (3) forming a pair is greater than the width of the friction members (3). This brake lining makes it possible to reduce braking noise. This brake lining can be easily applied to existing rolling stock, and manufacturing management thereof is easy.
The object of the present invention is to provide a compact for producing a sintered alloy which allows a sintered alloy obtained by sintering the compact to have improved mechanical strength and wear resistance, a wear-resistant iron-based sintered alloy, and a method for producing the same. The wear-resistant iron-based sintered alloy is produced by: forming a compact for producing a sintered alloy from a powder mixture containing a hard powder, a graphite powder, and an iron-based powder by powder compacting; and sintering the compact for producing a sintered alloy while diffusing C in the graphite powder of the compact for producing a sintered alloy in hard particles that constitute the hard powder. The hard particles contain 10% to 50% by mass of Mo, 3% to 20% by mass of Cr, and 2% to 15% by mass of Mn, with the balance made up of incidental impurities and Fe, and the hard powder and the graphite powder contained in the powder mixture account for 5% to 60% by mass and 0.5% to 2.0% by mass of the total amount of the hard powder, the graphite powder, and the iron-based powder, respectively.
The disc brake for railway vehicles is equipped with a brake disc that is fixed to the wheel or axle of a railway vehicle and a brake lining that is pressed against the sliding surface of the brake disc by brake calipers. The brake lining is obtained from: multiple friction members, the respective surfaces of which face the sliding surface of the brake disc, each friction member being disposed with gaps therebetween; back metals secured to the back surfaces of every friction member; and a substrate, which supports every friction member from the back surface via a spring member and which is installed on the brake calipers. With two adjacent friction members as a set, the back metal of the set of friction members is a single piece. Disc brakes of said configuration achieve both homogenization of contact surface pressure between the brake lining and the brake disc during braking and stabilization of the coefficient of friction therebetween as well as improving durability and reliability.
A leaf valve structure according to this invention comprises an annular valve seat, and a leaf that is seated on the valve seat under a predetermined elastic supporting force against a pressure of a working fluid on an inner side of the valve seat. A recessed depression portion having an opening portion on both an inner periphery of the valve seat and a seating surface of the leaf is formed in the valve seat, thereby creating a site where the pressure of the working fluid on the inner side of the valve seat can act more easily on a seating surface between the valve seat and the leaf valve. Accordingly, an effect of a surface adsorption force applied to the leaf valve by the valve seat on a cracking pressure can be suppressed, and as a result, the leaf valve can be lifted under a stable cracking pressure.
There is provided an iron-based mixture powder for sintering, as well as an iron-based sintered alloy using same, that are capable of reducing the cutting resistance of the iron-based sintered alloy and of mitigating the shortening of cutting tool life even when a metal fluoride powder is used. The iron-based mixture powder for sintering comprises an iron-based powder, a graphite powder, a hard powder that is harder than the iron-based powder, and a metal fluoride powder. With respect to particle asperity as expressed by the following equation, particle asperity = (perimeter of a section of a particle)2 / (sectional area of the section x 4Pi), the particle asperity of the metal fluoride powder is within the range of 2 to 5.
The disclosed leaf valve structure is provided with a ring-shaped valve sheet and a leaf that sits on the valve sheet under a prescribed elastic support force, resisting pressure from a working fluid on the inside of the valve sheet. A depression is formed in the valve sheet, said depressing having openings to the inner edge of the valve sheet and the seating surface of the leaf, respectively. This creates a region where the pressure of the working fluid on the inside of the valve sheet can more easily act on the surface where the leaf valve sits on the valve sheet. This minimizes the effect that the surface absorption force exerted on the leaf valve by the valve sheet has on the cracking pressure, allowing the leaf valve to be lifted up at a stable cracking pressure.
In order to prevent rotation at the installation position of a friction member, a rail car brake lining that is pressed against the sliding surface of a brake disc by a brake caliper is disclosed, which is equipped with friction members (11) that press against the sliding surface of the brake disc and a back plate (12) that is attached to the brake caliper in order to support the friction members (11). The friction members (11) are divided into at least two parts in the radial direction and the circumferential direction of the brake disc. Each of the friction members (11) are formed with a sliding material (11a) that comes into contact with the sliding surface of the brake disc, and a back metal (11b) that is fixed on the back plate (12) side of the sliding material (11a). Protrusions (11ba) are formed on the back plate (12) side of the back metal (11b). Grooves (12b) that come into contact with the protrusions (11ba) formed on the back metal (11b) are formed on the friction member (11) side of the back plate (12). Disc springs (14) or spherical seats (15) are interposed between the back plate (12) and the back metal (11b) of each friction member (11). As a result, rotation at the installation position of the friction members can be prevented without adding new components.
F16D 65/092 - Bands, shoes or pads; Pivots or supporting members therefor for axially-engaging brakes, e.g. disc brakes
B61H 5/00 - Applications or arrangements of brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
24.
HARD PARTICLES FOR BLENDING IN SINTERED ALLOY, WEAR-RESISTANT IRON-BASED SINTERED ALLOY CONTAINING HARD PARTICLES, VALVE SEAT FORMED OF SINTERED ALLOY, AND PROCESS FOR MANUFACTURING HARD PARTICLES
Hard particles for blending as a starting material in a sintered alloy contain 20 to 40 mass% of molybdenum, 0.5 to 1.0 mass% of carbon, 5 to 30 mass% of nickel, 1 to 10 mass% of manganese, 1 to 10 mass% of chromium, 5 to 30 mass% of cobalt, 0.05 to 2 mass% of yttrium, and the balance being inadvertent impurities and iron.
C22C 1/04 - Making non-ferrous alloys by powder metallurgy
C22C 27/04 - Alloys based on tungsten or molybdenum
C22C 33/02 - Making ferrous alloys by powder metallurgy
C22C 38/44 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
B22F 9/08 - Making metallic powder or suspensions thereof; Apparatus or devices specially adapted therefor using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
25.
Powder for dust core and method for producing the same
silicon impregnation is performed under a diffusion atmosphere allowing dissociation where the reaction rate at which the silicon element is dissociated is higher than the diffusion rate at which the silicon element is diffused throughout the surface layer of the soft magnetic metal powder via impregnation.
H01F 1/147 - Alloys characterised by their composition
H01F 1/20 - Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder
26.
Powder for magnetic core, method for manufacturing powder for magnetic core, and dust core
A method for manufacturing a powder for a magnetic core including at least a process of performing a siliconizing treatment on a surface of an iron powder containing elemental carbon. In the process of siliconizing treatment, a powder containing at least a silicon dioxide is brought into contact with the surface of the iron powder, elemental silicon is detached from the silicon dioxide by heating the powder of silicon dioxide, and the siliconizing treatment is performed by causing the detached elemental silicon to permeate and diffuse into a surface layer of the iron powder. The invention provides a method for manufacturing a powder for a magnetic core, by which loss reduction is achieved.
A method for forming a thin SiO2 film on a magnetic material by which a thin SiO2 film is formed on a surface of a magnetic material including iron and silicon as main components, the method including: an Fe oxide removal process of removing Fe oxide present on the surface of the magnetic material by performing a reduction treatment with respect to the magnetic material; and an oxidation treatment process of forming a thin SiO2 film on the surface of the magnetic material by performing an oxidation treatment with respect to the magnetic material from which the Fe oxide has been removed in the Fe oxide removal process. An electric resistance value of the magnetic material can be increased and eddy current loss can be decreased.
H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets
H01F 1/147 - Alloys characterised by their composition
H01F 1/33 - Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metallic particles having oxide skin
B22F 1/00 - Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
B22F 9/22 - Making metallic powder or suspensions thereof; Apparatus or devices specially adapted therefor using chemical processes with reduction of metal compounds starting from solid metal compounds using gaseous reductors
C23C 8/02 - Pretreatment of the material to be coated
28.
POWDER FOR DUST CORE AND PROCESS FOR PRODUCING THE SAME
A powder for dust cores is provided which comprises a soft-magnetic metal powder having a particle diameter (D), the powder having a silicon-containing layer as a surface layer ranging to less than 0.15D. Also provided is a process for producing the powder. The process comprises subjecting the surface of a soft-magnetic metal powder (1) containing carbon element to a silicon impregnation treatment to produce a powder (10) for dust cores which has a silicon-containing layer (2). The silicon impregnation treatment comprises: bringing a powder for silicon impregnation comprising at least a silicon compound into contact with the surface of the soft-magnetic metal powder (1); heat-treating the powder for silicon impregnation to thereby cause the silicon compound to release the silicon element; and causing the released silicon element to infiltrate and diffuse into a surface layer of the soft-magnetic metal powder. This silicon impregnation treatment is conducted in a release/diffusion atmosphere in which the rate of the reaction in which silicon element is generated by release is higher than the rate of the infiltration/diffusion of the silicon element into the surface layer of the soft-magnetic metal powder.
B22F 1/00 - Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
H01F 1/24 - Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated
29.
POWDER FOR MAGNETIC CORE, METHOD FOR MANUFACTURING POWDER FOR MAGNETIC CORE, AND DUST CORE
A method for manufacturing a powder for a magnetic core including at least a process of performing a siliconizing treatment on a surface of an iron powder (Ha) containing elemental carbon. In the process of siliconizing treatment, a powder (21a) containing at least a silicon dioxide is brought into contact with the surface of the iron powder (Ha), elemental silicon is detached from the silicon dioxide by heating the powder (21a) of silicon dioxide, and the siliconizing treatment is performed by causing the detached elemental silicon to permeate and diffuse into a surface layer of the iron powder (21a). The invention provides a method for manufacturing a powder for a magnetic core, by which loss reduction is achieved.
B22F 1/02 - Special treatment of metallic powder, e.g. to facilitate working, to improve properties; Metallic powders per se, e.g. mixtures of particles of different composition comprising coating of the powder
H01F 1/24 - Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated
Disclosed is a dust core having excellent insulating properties, high strength and high density (magnetic flux density). Also disclosed are a method for producing such a dust core, and an electric motor and a reactor, each having a core member composed of such a dust core. Specifically disclosed is a method for producing a dust core comprising a first step wherein a magnetic powder (1), which is obtained by forming an insulating film (a silica film (12)) over the surface of a soft magnetic metal powder (a pure iron powder (11)) in advance, and a resin powder (2) are prepared, a second step wherein the magnetic powder (1) and the resin powder (2) are mixed, thereby obtaining a powder mixture, and a third step wherein the resin powder (2) is gelled at a temperature at which condensation polymerization of the resin powder (2) does not occur, the powder mixture is press molded, thereby obtaining a press molded body (10), and then the press molded body (10) is annealed, thereby producing a dust core (20).
H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets
B22F 1/02 - Special treatment of metallic powder, e.g. to facilitate working, to improve properties; Metallic powders per se, e.g. mixtures of particles of different composition comprising coating of the powder
B22F 3/00 - Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor
H01F 1/26 - Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated by macromolecular organic substances
A process for producing a magnetic powder which is sufficiently reduced in core losses such as iron loss and hysteresis loss and has sufficient strength; and a process for producing a dust core. The process for magnetic powder production comprises using a magnetic-material powder produced by water atomization as a raw powder and subjecting the powder to sphering in which a mechanical impact is applied to the powder to sphere the powder particles. After the sphering, the powder is subjected to a particle enlargement treatment in which the powder is annealed at a temperature not lower than the austenite transformation point. The process for dust core production comprises compacting the magnetic powder thus produced.
H01F 1/20 - Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder
B22F 1/00 - Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets
patents
