# US 2024/0189901 A1 · Method for manufacturing a component with soft magnetic properties

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- Number: US 2024/0189901 A1
- Document ID: US20240189901A1
- Status: Published application
- Kind: A1
- Application number: 18/527,651
- Filed: 2023-12-04
- Published: 2024-06-13
- Earliest claimed: 2022-12-12
- Assignees: Miba Sinter Austria GmbH
- Applicants: Miba Sinter Austria GmbH
- Inventors: Anna FRUEHWIRTH; Laura GALVAO BARBOSA DE OLIVEIRA; Robert HELLEIN; Markus SCHAUER
- Web page: https://patentgrep.com/patent/US20240189901A1

## CPC

- B22F 3/02: Compacting only
- B22F 1/05: Metallic powder characterised by the size or surface area of the particles
- B22F 1/10: Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
- B22F 1/16: Metallic particles coated with a non-metal (coated with lubricating or binding agents or with organic material B22F1/10)
- B22F 1/17: Metallic particles coated with metal
- B22F 3/24: After-treatment of workpieces or articles {(B22F3/1146 takes precedence)}
- H01F 1/20: in the form of particles, e.g. powder (H01F1/147 takes precedence)
- H01F 41/02: for manufacturing cores, coils, or magnets (H01F41/14 takes precedence; for dynamo-electric machines H02K15/00)
- B22F 2003/247: {Removing material: carving, cleaning, grinding, hobbing, honing, lapping, polishing, milling, shaving, skiving, turning the surface}
- B22F 2003/248: {Thermal after-treatment}
- B22F 2304/10: Micron size particles, i.e. above 1 micrometer up to 500 micrometer
- B22F 2998/10: Processes characterised by the sequence of their steps
- B22F 2999/00: Aspects linked to processes or compositions used in powder metallurgy
- C22C 2202/02: Magnetic
- B22F: WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER (making alloys by powder metallurgy C22C); APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- C22C: ALLOYS (treatment of alloys C21D, C22F)

## Abstract

A method for producing a component with soft magnetic properties from particles of a SMC powder includes the steps of: pressing a SMC powder into a green compact, heat treatment of the green compact; wherein machining is performed after powder pressing and before heat treatment of the green compact in the green state.

## Claims

### Claim 1

A method of manufacturing a component (1) having soft magnetic properties from particles (2) of a SMC powder comprising the steps of:
pressing a SMC powder into a green compact,
heat treatment of the green compact;
if necessary, reworking the heat-treated green compact,
wherein machining is carried out after powder pressing and before heat treatment of the green compact in the green state.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the particles (2) of the SMC powder with an average particle size of between 60 μm and 500 μm are used.

### Claim 3 (depends on 1)

The method according to claim 1, wherein particles (2) of the SMC powder are used which at least partially have an insulation layer (4) with a layer thickness of at least 2 nm and at most 20 μm.

### Claim 4 (depends on 3)

The method according to claim 3, wherein the component (1) or the particles (2) of the SMC powder are additionally oxidized after pressing.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the green compact is heated to a temperature between 30° C. and 300° C. for machining.

### Claim 6 (depends on 1)

The method according to claim 1, wherein the machining is carried out using a cutting tool (7) with a cutting edge (8), the cutting edge (8) being guided at an angle of between 75° and 105° to the surface of the green compact to be machined during the machining.

### Claim 7 (depends on 1)

The method according to claim 1, wherein the green compact is produced with a density of at most 95% of the full density of the material from which the green compact is manufactured.

### Claim 8

A component (1) with soft magnetic properties comprising a component body at least partially consisting of a pressed and heat-treated SMC powder, wherein the component body has a machined surface (5) which has a surface roughness with an arithmetic mean roughness value Ra according to DIN EN ISO 4287:2010 of between 0.1 μm and 10 μm.

### Claim 9 (depends on 8)

The component (1) according to claim 8, wherein a machined surface (5) has an average surface roughness Rz according to DIN EN ISO 4287:2010 of between 1 μm and 50 μm.

### Claim 10 (depends on 8)

The component (1) according to claim 8, wherein the SMC powder comprises iron, the proportion of iron measured on the machined surface (5) of the component body being at most 90 m %.