US4501613A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wear resistant sintered body
Assignee: Toshiba Corp
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Filing: 1983-07-14
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Granted: 1985-02-26
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Expires: 2003-07-14
Abstract
Abstract The invention provides a method for manufacturing a sintered body, which comprises the steps of preparing a green compact comprising 5 to 60% weight of a chromium-containing ferroalloy powder, 0.2 to 2% by weight of a graphite powder, and a balance consisting substantially of an iron powder; sintering the green compact to provide a sintered body; nitriding the sintered body; and treating the nitrided sintered body with steam. The sintered body after nitridation may by subjected to a heat treatment in a non-oxidizing atmosphere before being steam-treated. A wear resistant sintered body manufactured by this method is also provided.
Inventors
- 👤 Shuji Matsumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:28
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/06; C23C8/34; B; B22; B22F; B22F3/00; B22F3/24; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0278; C22C33/0285
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
72 words
A wear resistant sintered body consisting essentially of 10 to 30% by weight of chromium, 0.2 to 2% by weight of carbon, 1 to 10% by weight of nickel, and a balance consisting of unavoidable impurities and iron, and wherein a metal carbide and a metal oxide are dispersed in a matrix obtained by tempering martensite, and nitrogen is included in at least the matrix in a form of a solid solution.
Claim 2
Dependent Claim
72 words
A wear resistant sintered body consisting essentially of 10 to 30% by weight of chromium, 0.2 to 2% by weight of carbon, 1 to 10% by weight of nickel, and a balance consisting of unavoidable impurities and iron, and wherein a metal carbide and a metal oxide are dispersed in a matrix obtained by tempering martensite, and nitrogen is included in at least the matrix in a form of a solid solution.
Claim 3
Dependent Claim
42 words
A sintered body according to claim 1, wherein part or all of the balance consists of 0.7 to 5% by weight of nickel, 0.7 to 3% by weight of copper, 0.3 to 1% by weight of molybdenum, and a balance of iron.
References Cited (Backward Citations)
DE2222904A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-26 | 1988-08-27 | 1989-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-26 | 1992-08-27 | 1993-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-26 | 1996-08-27 | 1997-02-26 | $7700.00 | Window Closed / Lapsed |