US4345943A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Abrasion resistant sintered alloy for internal combustion engines
Assignee: Nippon Piston Ring Co Ltd
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Filing: 1980-04-24
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Granted: 1982-08-24
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Expires: 2000-04-24
Abstract
Abstract An abrasion resistant sintered alloy for use in internal combustion engines which comprises 0.5 to 4.0% by weight of C, 5.0 to 3.0% by weight of Cr, less than 10.0% by weight of at least one of Ni, Mo, Co and Cu, 0.1 to 5.0% by weight of at least one of P, B and Si which permits liquid-phase sintering at temperatures not higher than 1,250° C. and the balance iron, and have hardness after sintering of Hv 500 to 1,200, 7 to 45% by area ratio of cementite or eutectic crystal of cementite and P and 0.2 to 10% by volume of sintering pores at least 40% of which consist of pores having a pore size of not larger than 150 μm.
Inventors
- 👤 Kentaro Takahashi
- 👤 Yoshikatsu Nakamura
- 👤 Masajiro Takeshita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:54
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0278; C22C33/0285
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
126 words
An abrasion resistant sintered alloy for use in internal combustion engines which comprises 0.5 to 4.0% by weight of C, 5.0 to 30.0% by weight of Cr, less than 10.0% by weight of at least one of Ni, Mo, Co and Cu, 0.1 to 5.0% by weight of at least one of P, B and Si which permits a low temperature liquid-phase sintering at temperatures not higher than 1,250° C. and the balance iron, and have hardness after sintering of Hv 500 to 1,200, 7 to 45% by area ratio of cementite or eutectic crystal of cementite and P and 0.2 to 10% by volume of sintering pores at least 40% of which consist of pores having a pore size of not larger than 150 μm.
Claim 2
Dependent Claim
126 words
An abrasion resistant sintered alloy for use in internal combustion engines which comprises 0.5 to 4.0% by weight of C, 5.0 to 30.0% by weight of Cr, less than 10.0% by weight of at least one of Ni, Mo, Co and Cu, 0.1 to 5.0% by weight of at least one of P, B and Si which permits a low temperature liquid-phase sintering at temperatures not higher than 1,250° C. and the balance iron, and have hardness after sintering of Hv 500 to 1,200, 7 to 45% by area ratio of cementite or eutectic crystal of cementite and P and 0.2 to 10% by volume of sintering pores at least 40% of which consist of pores having a pore size of not larger than 150 μm.
Claim 3
Dependent Claim
29 words
The abrasion resistant sintered alloy according to claim 1, wherein said alloy comprises 0.1 to 10.0% of Ni, 0.1 to 4.0% of Mo and 0.1 to 5.0% of P.
Claim 4
Dependent Claim
40 words
The abrasion resistant sintered alloy according to claim 1, wherein said alloy comprises 5.0 to 20.0% of Cr, 0.4 to 3.0% by weight of Mo, 0.1 to 5.0% by weight of Ni and 0.2 to 3.0% by weight of P.
Claim 5
Dependent Claim
33 words
The abrasion resistant sintered alloy according to claim 3, wherein said alloy comprises 0.1 to 5.0% by weight of Co and/or Cu, less than 1.5% of Si and less than 1.0% of Mn.
Claim 6
Dependent Claim
22 words
The alloy of claim 1, wherein said alloy is heated, after sintering, at a temperature of about 400° C. to 1250° C.
Claim 7
Dependent Claim
20 words
The alloy of claim 1, wherein the alloy is heated, after sintering, at a temperature of about 870° C.-1250° C.
Claim 8
Dependent Claim
19 words
The alloy of claim 1, wherein the alloy is heated, after sintering, at a temperature of about 870° C.
Claim 9
Dependent Claim
19 words
The alloy of claim 1, wherein the alloy is heated, after sintering, at a temperature of about 400° C.
References Cited (Backward Citations)
US1707364A
Cited
US2038639A
Cited
US2186758A
Cited
US2256135A
Cited
US3698877A
Cited
US3767386A
Cited
US3890105A
Cited
US3977838A
Cited
US4000980A
Cited
DE2508798C3
Cited
US4021205A
Cited
US4243414A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-23 | 1986-02-22 | 1986-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-23 | 1990-02-22 | 1990-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-23 | 1994-02-22 | 1994-08-24 | $7700.00 | Window Closed / Lapsed |