US3890686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface coating for ferrous alloy parts
Assignee: Centre Stephanois de Recherches Mecaniques Hydromecanique et Frottement SA
•
Filing: 1974-04-24
•
Granted: 1975-06-24
•
Expires: 1994-04-24
Abstract
Abstract Mechanical parts of ferrous alloys are provided with a coating consisting essentially of FeSn2, FeSn, and FeSnCx, with x ranging from 0.7-1.3.
Inventors
- 👤 Jacques-Jean Caubet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:22
CPC Classifications
C; C23; C23C; C23C10/00; C23C10/06; C23C10/08; C23C10/28; C23C10/34; C23C10/36; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/926; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12951; Y10T428/12958; Y10T428/12986
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
121 words
A MACHANICAL PART MADE OF FERROUS ALLOYS AND COATED WTH A SURFACE LAYER, CHARACTERIZED IN THAT SAID LAYER ENABLES THE PART TO RESIST WEAR, SEIZING, CORROSION AND SHOCKS AT THE SAME TIME, WHILE SIMULTANEOUSLY THE ABILITY TO ADSORB A FILM OF LUBRICATING OIL INCREASES WITHOUT THE RESISTANCE TO FATIGUE BEING ALTERED, SAID LAYER CONSISTING ESSENTIALLY OF THE FESN2, FESN, FESNCX PHASES (X RANGING FROM 0.7 TO 1.3), ACCORDING TO THE FOLLOWING PROPORTIONS: FESN2 RANGING FROM 5 TO 30 PERCENT BY VOLUME FESN RANGING FROM 60 TO 95 PERCENT BY VOLUME FESNCX RANGING FROM 0 TO 10 PERCENT BY VOLUME, THE DISTRIBUTION OF SAID THREE PHASES WITHIN THE LAYER BEING IN ACCORDANCE WITH THE DIAGRAMS OF FIGS. 1, 2 AND 3, RESPECTIVELY.
Claim 2
Dependent Claim
121 words
A MACHANICAL PART MADE OF FERROUS ALLOYS AND COATED WTH A SURFACE LAYER, CHARACTERIZED IN THAT SAID LAYER ENABLES THE PART TO RESIST WEAR, SEIZING, CORROSION AND SHOCKS AT THE SAME TIME, WHILE SIMULTANEOUSLY THE ABILITY TO ADSORB A FILM OF LUBRICATING OIL INCREASES WITHOUT THE RESISTANCE TO FATIGUE BEING ALTERED, SAID LAYER CONSISTING ESSENTIALLY OF THE FESN2, FESN, FESNCX PHASES (X RANGING FROM 0.7 TO 1.3), ACCORDING TO THE FOLLOWING PROPORTIONS: FESN2 RANGING FROM 5 TO 30 PERCENT BY VOLUME FESN RANGING FROM 60 TO 95 PERCENT BY VOLUME FESNCX RANGING FROM 0 TO 10 PERCENT BY VOLUME, THE DISTRIBUTION OF SAID THREE PHASES WITHIN THE LAYER BEING IN ACCORDANCE WITH THE DIAGRAMS OF FIGS. 1, 2 AND 3, RESPECTIVELY.
Claim 3
Dependent Claim
29 words
A mechanical part made of ferrous alloys according to claim 1, characterized in that the Vickers hardness of the layer coating the part ranges from 5 to 80 microns.
Claim 4
Dependent Claim
94 words
A mechanical part made of ferrous alloys according to claim 1, characterized in that the Vickers hardness of the layer coating the part, as measured under a load of 15 g, conforms to the following law as a function of the thickness e of the layer: at a depth of e/5 from the outside towards the inside, the hardness should range from 500 to 600 Vickers; then, it increases and passes through a maximum which is found at a depth between e/5 and e, said maximum having to range from 600 to 900 Vickers.
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) | 1978-06-23 | 1978-12-23 | 1979-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-23 | 1982-12-23 | 1983-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-23 | 1986-12-23 | 1987-06-24 | $7700.00 | Window Closed / Lapsed |