US4069045A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metal powder suited for powder metallurgical purposes, and a process for manufacturing the metal powder
Assignee: SKF Nova AB
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Filing: 1976-05-17
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Granted: 1978-01-17
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Expires: 1996-05-17
Abstract
Abstract A steel powder suited for powder metallurgical purposes consists of an amorphous to compact-grained, essentially dendrite-free material with irregularly cornered particle shape. Such a steel powder may be produced by causing molten steel to form at least one discrete, relatively thin film on a relatively cold metal surface of great cooling capacity, causing the thin film to solidify extremely rapidly on the metal surface to form a brittle amorphous to compact-grained, in principle completely dendrite-free steel film, and crushing or grinding the brittle film into a powder of an irregularly cornered particle shape.
Inventors
- 👤 Bengt G. S. Lundgren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:44
CPC Classifications
C; C22; C22C; C22C45/00; B; B22; B22F; B22F9/00; B22F9/002; B22F9/008; B22F9/02; B22F9/06; B22F9/08; B22F9/10; Y; Y10; Y10S; Y10S75/00; Y10S75/954; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
26 words
A steel powder suited for powder metallurgical purposes, characterized in that it consists of an amorphous to compact-grained, essentially dendrite-free material with irregularly cornered particle shape.
Claim 2
Dependent Claim
26 words
A steel powder suited for powder metallurgical purposes, characterized in that it consists of an amorphous to compact-grained, essentially dendrite-free material with irregularly cornered particle shape.
Claim 3
Dependent Claim
19 words
A steel powder according to claim 1, characterized in that the steel has a hardness of at least HRC=60.
Claim 4
Dependent Claim
23 words
An article manufactured from powder in a powder metallurgical manner, characterized in that the powder comprises the steel powder according to claim 1.
Claim 5
Dependent Claim
100 words
A process for the production of a steel powder suited for powder metallurgical purposes, comprising the steps of (1) causing, in a vacuum or protective gas, molten steel of such composition that rapid cooling of thin films of the melt produces brittle crushable films to impinge upon a cold metal surface having great cooling capacity moving rapidly and substantially across the direction of delivery of the molten steel, thereby forming a thin, brittle, and easily crushed, amorphous to compact-grained, essentially dendrite-free steel film, and (2) crushing or grinding the steel film into a powder of an irregularly cornered particle shape.
Claim 6
Dependent Claim
100 words
A process for the production of a steel powder suited for powder metallurgical purposes, comprising the steps of (1) causing, in a vacuum or protective gas, molten steel of such composition that rapid cooling of thin films of the melt produces brittle crushable films to impinge upon a cold metal surface having great cooling capacity moving rapidly and substantially across the direction of delivery of the molten steel, thereby forming a thin, brittle, and easily crushed, amorphous to compact-grained, essentially dendrite-free steel film, and (2) crushing or grinding the steel film into a powder of an irregularly cornered particle shape.
Claim 7
Dependent Claim
23 words
A process according to claim 4, in which the molten steel cools at a rate of at least about 10 4 ° C/s.
Claim 8
Dependent Claim
19 words
A process according to claim 5, in which the cooling rate is at least about 10 6 ° C/s.
Claim 9
Dependent Claim
16 words
A process according to claim 4, wherein the films' thickness is at most about 0.5 mm.
Claim 10
Dependent Claim
14 words
A process according to claim 7, wherein the films' thickness is about 0.1 mm.
Claim 11
Dependent Claim
46 words
A process according to claim 7, in which flake-shaped films are produced having a ratio of length to thickness of at least 100, a ratio of width to thickness of at least about 20, and a ratio of length to width of at most about 5.
Claim 12
Dependent Claim
18 words
A process according to claim 4, in which the films produced have a hardness of at least HRC=60.
References Cited (Backward Citations)
US3151971A
Cited
DE2127563A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-16 | 1981-07-18 | 1982-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-16 | 1985-07-18 | 1986-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-16 | 1989-07-18 | 1990-01-17 | $7700.00 | Window Closed / Lapsed |