US3971632A
Expired / Lapsed
US
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Sintered abrasion resistant iron alloy having a homogeneous carbide network
Assignee: ZF Friedrichshafen AG
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Filing: 1973-10-16
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Granted: 1976-07-27
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Expires: 1993-10-16
Abstract
Abstract A particular composition and method are given for an iron alloy which will produce an article by sintering which is highly resistant to abrasion as well as possessing high tensile strength. The alloy is particularly useful for bearings, either rotary or planar. Conditions of sintering are described to produce articles from a novel sintering powder having a homogenous carbide network in a lamellated, perlitic base structure with interspersed residual austenite and martensite to considerably improve the abrasion resistance.
Inventors
- 👤 Berthold Menrad
- 👤 Karl Ripper
- 👤 Rudolf Ilg
- 👤 Georg Dietrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:56
CPC Classifications
C; C22; C22C; C22C33/00; C22C33/02; C22C33/0257; C22C33/0264
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
An abrasion resistant sintered iron alloy having a homogenous carbide network in a lamellated, perlitic base structure with interspersed residual austenite and martensite with a composition 1% - 1.35%
graphitic carbon
2% - 2.4% manganese
1.4% - 1.7%
nickel
1% copper
0.2% copper borate the remainder being essentially iron.
Claim 2
Dependent Claim
49 words
An abrasion resistant sintered iron alloy having a homogenous carbide network in a lamellated, perlitic base structure with interspersed residual austenite and martensite with a composition 1% - 1.35%
graphitic carbon
2% - 2.4% manganese
1.4% - 1.7%
nickel
1% copper
0.2% copper borate the remainder being essentially iron.
References Cited (Backward Citations)
GB975322A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-27 | 1980-01-26 | 1980-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-27 | 1984-01-26 | 1984-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-27 | 1988-01-26 | 1988-07-27 | $7700.00 | Window Closed / Lapsed |