US3640799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing a wear-resistant surface on a workpiece
Assignee: Wankel GmbH
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Filing: 1969-09-30
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Granted: 1972-02-08
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Expires: 1989-09-30
Abstract
Abstract A process and apparatus for galvanic deposition on a workpiece, particularly the inner surface of trochoidal engine housings, of a metal matrix containing dispersed particles, for the purpose of improving wear resistance of highly stressed surfaces.
Inventors
- 👤 Gerhard Stephan
- 👤 Heinz Harst
- 👤 Gunter Laux
- 👤 Alfred Kappes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:23
CPC Classifications
C; C25; C25D; C25D5/00; C25D5/10; C25D5/12; C25D5/14; C25D15/00; C25D15/02; C25D7/00; C25D7/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
28 words
A process as recited in claim 1, wherein during the deposition of the matrix containing particles the electrolytic bath is held at a pH between 5 and 6.
Claim 2
Dependent Claim
98 words
A process as recited in claim 2, wherein the electrolytic bath contains, per liter of electrolyte: 80 to 100 grams of nickel in nickel sulfamate and nickel chloride, 2.5 to 3 grams of chlorine in nickel chloride, 20 to 30 grams of boric acid, 1.5 to 2.5 grams of saccharine, and 90 to 100 grams of particles selected from the group consisting of silicon carbide, silicon dioxide, aluminum oxide, tungsten carbide, and boron carbide; and the bath is held during deposition of the matrix at a temperature of 50* to 70* C. and at a pH of 5.2.
Claim 3
Dependent Claim
52 words
A process as recited in claim 3, wherein the first nickel layer is approximately 15 microns thick and is deposited at a current density of approximately 18.6 amperes per square foot, and the second nickel layer containing hard particles is deposited at a current density of approximately 186 amperes per square foot.
Claim 4
Dependent Claim
57 words
A process as recited in claim 4, wherein the current density of approximately 18.6 amperes per square foot is maintained for 20 to 30 minutes to deposit the first nickel layer, and the current density of approximately 186 amperes per square foot is maintained for about 100 minutes to deposit the second nickel layer containing hard particles.
References Cited (Backward Citations)
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US3298802A
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US3449223A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |