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US4778522A
Expired / Lapsed
US
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Wear resistant iron-base sintered alloy
Assignee: Nissan Motor Co Ltd
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Filing: 1987-03-09
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Granted: 1988-10-18
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Expires: 2007-03-09
Abstract
Abstract A wear resistant iron-base sintered alloy consists essentially of at least one selected from the group consisting of molybdenum and tungsten, ranging from 5 to 20% by weight, chromium ranging from 2 to 10% by weight, silicon ranging from 0.1 to 0.9% by weight, manganese ranging not more than 0.7% by weight, phosphorus ranging not more than 0.05% by weight, carbon ranging from 0.1 to 0.8% by weight, boron ranging from 0.5 to 2.0% by weight, and balance including iron and an impurity, so that fine multiple carbide, multiple boride, and/or multiple carbide-boride can be homogeneously dispersed as hard grains in the structure of a matrix, thereby exhibiting excellent wear resistance, scuffing resistance and pitting resistance.
Inventors
- 👤 Yoshihiro Maki
- 👤 Makoto Kano
- 👤 Akira Fujiki
- 👤 Ichiro Tanimoto
- 👤 Hiroyuki Endo
- 👤 Yukata Ikenoue
- 👤 Kei Ishii
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:06
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0278
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
83 words
A wear resistant iron-base sintered alloy consisting essentially of at least one selected from the group consisting of molybdenum and tungsten, ranging from 5 to 20% by weight, chromium ranging from 2 to 10% by weight, silicon ranging from 0.1 to 0.9% by weight, manganese ranging not more than 0.7% by weight, phosphorus ranging not more than 0.05% by weight, carbon ranging from 0.1 to 0.8% by weight, boron ranging from 0.5 to 2.0% by weight, and balance including iron and an impurity.
Claim 2
Dependent Claim
83 words
A wear resistant iron-base sintered alloy consisting essentially of at least one selected from the group consisting of molybdenum and tungsten, ranging from 5 to 20% by weight, chromium ranging from 2 to 10% by weight, silicon ranging from 0.1 to 0.9% by weight, manganese ranging not more than 0.7% by weight, phosphorus ranging not more than 0.05% by weight, carbon ranging from 0.1 to 0.8% by weight, boron ranging from 0.5 to 2.0% by weight, and balance including iron and an impurity.
Claim 3
Dependent Claim
35 words
A wear resistant iron-base sintered alloy as claimed in claim 1, further consisting essentially of at least one selected from the group consisting of vanadium, niobium, and tantalum, ranging from 0.5 to 8% by weight.
Claim 4
Dependent Claim
36 words
A wear resistant iron-base sintered alloy as claimed in claim 2, further consisting essentially of at least one selected from the group consisting of titanium, zirconium, hafnium, and cobalt, ranging not more than 12% by weight.
Claim 5
Dependent Claim
26 words
A wear resistant iron-base sintered alloy as claimed in claim 1, wherein said carbon and boron are present as a solid solution of carbide and boride.
Claim 6
Dependent Claim
26 words
A wear resistant iron-base sintered alloy as claimed in claim 4, wherein said carbide and boride are homogeneously dispersed as hard grains in the sintered alloy.
Claim 7
Dependent Claim
40 words
A wear resistance iron-base sintered alloy as claimed in claim 1, further consisting essentialy of at least one selected from the group consisting of vanadium, niobium, tantalum, titanium, zirconium, hafnium, cobalt and nickel, ranging not more than 20% by weight.
Claim 8
Dependent Claim
29 words
A wear resistant iron-base sintered alloy as claimed in claim 1, wherein the ratio in atomic weight between total of molybdenum and tungsten and boron is 8:10 to 15:10.
Claim 9
Dependent Claim
26 words
A wear resistant iron-base sintered allow as claimed in claim 1, wherein said sintered alloy has a Rockwell C-scale hardness number ranging from 50 to 65.
References Cited (Backward Citations)
GB2007710A
Cited
GB2011470A
Cited
US4345943A
Cited
US4348232A
Cited
US4318733A
Cited
JPS572867A
Cited
JPS5792158A
Cited
JPS5822358A
Cited
JPS5822359A
Cited
JPS58130260A
Cited
GB2116207A
Cited
US4487630A
Cited
US4599109A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-18 | 1992-04-18 | 1992-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-18 | 1996-04-18 | 1996-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-18 | 2000-04-18 | 2000-10-18 | $7700.00 | Window Closed / Lapsed |