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US4268309A
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Wear-resisting sintered alloy
Assignee: Toyota Motor Corp
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Filing: 1978-11-14
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Granted: 1981-05-19
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Expires: 1998-11-14
Abstract
Abstract Wear-resisting iron base sintered alloy obtained by sintering a metal powder composed of, by weight, 15-25% chromium, 0-3% molybdenum, 1-5% copper, 0.3-0.8% phosphorus and 2.0-4.0% carbon, with the balance iron and less than 2% impurities, to a density of more than 7.3 g/cm3.
Inventors
- 👤 Yoichi Serino
- 👤 Tetsuya Suganuma
- 👤 Yoshitaka Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:03
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/36; C22C33/00; C22C33/02; C22C33/0257; C22C33/0278; C22C33/0285; C22C33/0292
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
42 words
A wear-resisting iron base sintered alloy comprising a sintering of more than 7.3 g/cm 3 density, of a metal powder composed of Cr, 15-25%; Mo, 0-3%; Cu, 1-5%, P, 0.3-0.8%; and C, 2.0-4.0%; the balance being Fe and less than 2% impurities.
Claim 2
Dependent Claim
42 words
A wear-resisting iron base sintered alloy comprising a sintering of more than 7.3 g/cm 3 density, of a metal powder composed of Cr, 15-25%; Mo, 0-3%; Cu, 1-5%, P, 0.3-0.8%; and C, 2.0-4.0%; the balance being Fe and less than 2% impurities.
Claim 3
Dependent Claim
9 words
Sintered alloy of claim 1, wherein Mo-content is zero.
Claim 4
Dependent Claim
11 words
Sintered alloy of claim 1, wherein Mo-content is less than 3%.
Claim 5
Dependent Claim
18 words
Sintered alloy of claim 1, comprising hard, fine composite carbides evenly distributed in a matrix of Fe-Cr-(Mo)-Cu-P-C system.
Claim 6
Dependent Claim
23 words
Sintered alloy of claim 4, wherein said composite carbides are (Fe, Cr) 7 C 3 or (Fe, Cr, Mo) 7 C 3 .
Claim 7
Dependent Claim
13 words
Sintered alloy of claim 4, wherein the size of composite carbide is 5-6μ.
Claim 8
Dependent Claim
11 words
Sintered alloy of claim 1, which is 400-700 in Hv hardness.
Claim 9
Dependent Claim
23 words
Sintered alloy of claim 1, which is obtained by press forming an alloy powder in a metal mold and heating the molded product.
Claim 10
Dependent Claim
28 words
Sintered alloy of claim 8, wherein press forming is done under a pressure of 6.5 t/cm 2 to yield a molded product with density 6.2-6.4 g/cm 3 .
Claim 11
Dependent Claim
23 words
Sintered alloy of claim 1, wherein the sintering is done at 1100°-1200° C. for 60 minutes in an atmosphere of decomposed ammonia gas.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-18 | 1984-11-17 | 1985-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-18 | 1988-11-17 | 1989-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-18 | 1992-11-17 | 1993-05-19 | $7700.00 | Window Closed / Lapsed |