EP0099067A2
Expired / Lapsed
EP
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Wear-resistant sintered ferrous alloy and method of producing same
Assignee: Nissan Motor Co Ltd
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Filing: 1983-07-06
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Granted: —
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Expires: 2003-07-06
Abstract
Abstract A sintered ferrous alloy high in wear resistance and suitable for parts subjected to rubbing friction such as rocker arm tips. The alloy is produced by compacting and sintering a powder mixture of 16-50 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 and 46.5-83 parts by weight of either a Fe-P alloy powder or a mixture of a Fe-P alloy powder and an iron powder. The powder mixture is prepared so as to contain 0.2-1.0% by weight of P.
Inventors
- 👤 Yoshihiro Maki
- 👤 Takaaki Oaku
- 👤 Yasuzi Hokazono
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-26 12:32
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0207; C22C33/0257
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
109 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 16 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 and a phosphorus-containing powder which comprises a Fe-P alloy powder such that the prepared powder mixture contains 0.2 to 1.0% by weight of P; compacting said powder mixture into a body of a desired shape; and sintering said body in a nonoxidizing atmosphere.
Claim 2
Independent Claim
109 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 16 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 and a phosphorus-containing powder which comprises a Fe-P alloy powder such that the prepared powder mixture contains 0.2 to 1.0% by weight of P; compacting said powder mixture into a body of a desired shape; and sintering said body in a nonoxidizing atmosphere.
Claim 3
Dependent Claim
17 words
A method according to Claim 1, wherein said phosphorus-containing powder is substantially entirely said Fe-P alloy powder.
Claim 4
Dependent Claim
18 words
A method according to Claim 2, wherein said Fe-P alloy contains 0.2 to 1.0% by weight of P.
Claim 5
Dependent Claim
22 words
A method according to Claim 1, wherein said phosphorus-containing powder is a mixture of a Fe-P alloy powder and an iron powder.
Claim 6
Dependent Claim
18 words
A method according to Claim 4, wherein said Fe-P alloy contains 20 to 40% by weight of P.
Claim 7
Dependent Claim
23 words
A method according to Claim 1, wherein said phosphorus-containing powder is a mixture of a Fe-P alloy powder and a low-alloy iron powder.
Claim 8
Dependent Claim
18 words
A method according to Claim 6, wherein said Fe-P alloy contains 20 to 40% by weight of P.
Claim 9
Dependent Claim
28 words
A method according to Claim 1, wherein the amount of the Fe-Cr-B alloy in the first step is in the range from 20 to 30 parts by weight.
Claim 10
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 11
Dependent Claim
25 words
A method according to Claim 1, wherein the sintering is performed at a temperature in the range from about 1050°C to about 1140 0 C.
Claim 12
Dependent Claim
35 words
A wear-resistant sintered ferrous alloy consisting essentially of 1.6 to 17.5% of Cr, 0.16 to 1.25% of B, 1.0 to 3.5% of C, 0.2 to 1.0% of P, by weight, and the balance of Fe.
Claim 13
Dependent Claim
35 words
A wear-resistant sintered ferrous alloy consisting essentially of 1.6 to 17.5% of Cr, 0.16 to 1.25% of B, 1.0 to 3.5% of C, 0.2 to 1.0% of P, by weight, and the balance of Fe.
Claim 14
Dependent Claim
41 words
A sintered ferrous alloy according to Claim 11, 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 15
Dependent Claim
20 words
A sintered ferrous alloy according to Claim 11, wherein the porosity of the sintered alloy is not greater than 20%.
References Cited (Backward Citations)
No citation records indexed.
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