US4035159A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Iron-base sintered alloy for valve seat
Assignee: Toyota Motor Corp
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Filing: 1976-03-03
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Granted: 1977-07-12
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Expires: 1996-03-03
Abstract
Abstract Iron-base sintered alloy for the valve seats of internal combustion engines is an iron-base alloy powder containing, by weight, 6 - 20% chromium less than 2.0% nickel, and carbon 0.2 - 1.5%, together with at least one additive selected from among 0.3 - 1.5% manganese, 0.2 - 1.5% sulfur, 0.5 - 8% molybdenum, and 0.5 - 2.5% silicon, and molded to a sintered density of 6.2 - 6.8 g/cm3.
Inventors
- 👤 Kametaro Hashimoto
- 👤 Kenji Ushitani
- 👤 Youichi Serino
- 👤 Tetsuya Suganuma
- 👤 Seishu Mitani
- 👤 Kunizou Imanishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:23
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0207; C22C33/0221; C22C33/0257; C22C33/0278; C22C33/0285; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
113 words
Method of manufacturing an iron-base sintered alloy for use in valve seats which comprises the steps of adding 0.2- 15% carbon in the form of graphite powder, and at least two additives selected from the group consisting of 0.3- 1.5% manganese, 0.2- 1.5% sulfur, 0.5- 8% molybdenum, and 0.2- 2.5% silicon by weight to a constituent alloy in powder form having an iron base and containing 6- 20% chromium and 0- 2.0% nickel by weight, molding the resulting mixture to a required shape by applying pressure thereto, and then sintering the molding at a temperature of 1120°- 1200° C. to yield an alloy having a sintered density of 6.2- 6.8 g/cm 3 .
Claim 2
Dependent Claim
113 words
Method of manufacturing an iron-base sintered alloy for use in valve seats which comprises the steps of adding 0.2- 15% carbon in the form of graphite powder, and at least two additives selected from the group consisting of 0.3- 1.5% manganese, 0.2- 1.5% sulfur, 0.5- 8% molybdenum, and 0.2- 2.5% silicon by weight to a constituent alloy in powder form having an iron base and containing 6- 20% chromium and 0- 2.0% nickel by weight, molding the resulting mixture to a required shape by applying pressure thereto, and then sintering the molding at a temperature of 1120°- 1200° C. to yield an alloy having a sintered density of 6.2- 6.8 g/cm 3 .
Claim 3
Dependent Claim
16 words
Method as claimed in claim 1, in which sulfur is added in the form of sulfide.
Claim 4
Dependent Claim
20 words
Method as claimed in claim 1, in which manganese, silicon and molybdenum added are in the form of iron compounds.
Claim 5
Dependent Claim
17 words
Method as claimed in claim 1 in which said alloy in powder form comprises 1- 2% nickel.
Claim 6
Dependent Claim
10 words
Iron-base sintered alloy made by the process of claim 1.
Claim 7
Dependent Claim
19 words
Iron-base sintered alloy made by the process of claim 1 in which said constituent alloy comprises 1- 2% nickel.
Claim 8
Dependent Claim
21 words
Iron-base sintered alloy made by the process of claim 6 comprising 0.3- 1.5% manganese, 1- 8% molybdenum and 1.5- 2.5% silicon.
Claim 9
Dependent Claim
18 words
Iron-base sintered alloy made by the process of claim 6 comprising 0.2- 1.5% sulfur and 1.5- 4.5% molybdenum.
Claim 10
Dependent Claim
23 words
Iron-base sintered alloy made by the process of claim 6 in which said constituent alloy powder has a particle size of -100 mesh.
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) | 1980-07-11 | 1981-01-10 | 1981-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-11 | 1985-01-10 | 1985-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-11 | 1989-01-10 | 1989-07-12 | $7700.00 | Window Closed / Lapsed |