US4561889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wear-resistant sintered ferrous alloy and method of producing same
Assignee: Nissan Motor Co Ltd
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Filing: 1983-10-25
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Granted: 1985-12-31
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Expires: 2003-10-25
Abstract
Abstract A sintered ferrous alloy which is high in wear resistance and relatively weak in the tendency to abrade another metal material with which the sintered alloy makes rubbing contact and suitable for rocker arm tips in automotive engines for example. The sintered alloy is produced by compacting and sintering a powder mixture of 15-50 parts by weight of a Fe-Cr-B alloy powder, which contains 10-35% of Cr and 1.0-2.5% of B, 1.0-3.5 parts by weight of graphite powder, such an amount of a Cu-P alloy powder that the powder mixture contains 0.2-1.5% of P and 1.0-20.0% of Cu and the balance of an iron powder.
Inventors
- 👤 Takaaki Oaku
- 👤 Yasuzi Hokazono
- 👤 Masahiko Shiota
- 👤 Yoshihiro Maki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:55
CPC Classifications
F; F02; F02F; F02F7/00; F02F7/0085; C; C22; C22C; C22C33/00; C22C33/02; C22C33/0207; C22C33/0257; C22C33/0278; C22C33/0285; F01; F01L; F01L1/00; F01L1/12; F01L1/14; F01L1/18
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
121 words
A method of producing a wear-resistant sintered ferrous alloy, the method comprising the steps of: preparing 100 parts by weight of a powder mixture by mixing 15 to 50 parts by weight of a powder of a Fe-Cr-B alloy which contains 10 to 35% by weight of Cr and 1.0 to 2.5% by weight of B, 1.0 to 3.5 parts by weight of a graphite powder, such an amount of a Cu-P alloy powder that the prepared powder mixture contains 0.2 to 1.5% by weight of P and 1.0 to 20.0% by weight of Cu and the balance of an iron powder; compacting said powder mixture into a body of a desired shape; and sintering said body in a nonoxidizing atmosphere.
Claim 2
Independent Claim
121 words
A method of producing a wear-resistant sintered ferrous alloy, the method comprising the steps of: preparing 100 parts by weight of a powder mixture by mixing 15 to 50 parts by weight of a powder of a Fe-Cr-B alloy which contains 10 to 35% by weight of Cr and 1.0 to 2.5% by weight of B, 1.0 to 3.5 parts by weight of a graphite powder, such an amount of a Cu-P alloy powder that the prepared powder mixture contains 0.2 to 1.5% by weight of P and 1.0 to 20.0% by weight of Cu and the balance of an iron powder; compacting said powder mixture into a body of a desired shape; and sintering said body in a nonoxidizing atmosphere.
Claim 3
Dependent Claim
19 words
A method according to claim 1, wherein said Cu-P alloy powder contains 8 to 15% by weight of P.
Claim 4
Dependent Claim
16 words
A method according to claim 1, wherein said iron powder is a substantially pure iron powder.
Claim 5
Dependent Claim
15 words
A method according to claim 1, wherein said iron powder is a low-alloy iron powder.
Claim 6
Dependent Claim
29 words
A method according to claim 1, wherein the amount of the Fe-Cr-B alloy powder in the first step is in the range from 20 to 30 parts by weight.
Claim 7
Dependent Claim
18 words
A method according to claim 1, wherein said Fe-Cr-B alloy contains up to 3.0% by weight of Si.
Claim 8
Dependent Claim
25 words
A method according to claim 1, wherein the sintering is performed at a temperature in the range from about 1000° C. to about 1140° C.
Claim 9
Dependent Claim
40 words
A wear-resistant sintered ferrous alloy consisting essentially of 1.5 to 17.5% of Cr, 0.15 to 1.25% of B, 1.0 to 3.5% of C, 0.2 to 1.5% of P, 1.0 to 20.0% of Cu, by weight, and the balance of Fe.
Claim 10
Dependent Claim
40 words
A wear-resistant sintered ferrous alloy consisting essentially of 1.5 to 17.5% of Cr, 0.15 to 1.25% of B, 1.0 to 3.5% of C, 0.2 to 1.5% of P, 1.0 to 20.0% of Cu, by weight, and the balance of Fe.
Claim 11
Dependent Claim
41 words
A sintered ferrous alloy according to claim 8, wherein the content of Cr in the alloy is in the range from 2.0 to 10.5% by weight, and the content of B is in the range from 0.20 to 0.75% by weight.
Claim 12
Dependent Claim
20 words
A sintered ferrous alloy according to claim 8, wherein the porosity of the sintered alloy is not greater than 20%.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-12-30 | 1989-07-01 | 1989-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-30 | 1993-07-01 | 1993-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-30 | 1997-07-01 | 1997-12-31 | $7700.00 | Window Closed / Lapsed |