US4069357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for diffusing metallic coatings into ceramics to improve their voltage withstanding capabilities
Assignee: United States Department of Energy
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Filing: 1976-11-09
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Granted: 1978-01-17
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Expires: 1996-11-09
Abstract
Abstract The disclosure relates to a method for diffusing a coating of manganese powder and titanium powder into a ceramic to improve its voltage hold off withstanding capability. The powder coated ceramic is fired for from about 30 to about 90 minutes within about one atmosphere of wet hydrogen at a temperature within the range of from about 1450° to about 1520° C to cause the mixture to penetrate into the ceramic to a depth on the order of a millimeter.
Inventors
- 👤 H. Craig Miller
- 👤 Herbert F. Zuhr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:43
CPC Classifications
H; H01; H01B; H01B19/00; H01B19/04; H01B17/00; H01B17/42
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
149 words
A method for penetratingly covering an alumina ceramic insulator with metal so that the metal is diffused into the surface of the insulator a preselected amount, the method comprising: coating the insulator with a mixture comprising manganese powder and titanium powder, the manganese and titanium powder mixture ranging from about two parts by metal weight of manganese and five parts by metal weight of titanium to about seven parts by metal weight of manganese and one part by metal weight of titanium, the manganese and titanium together constituting essentially 100% of the metal present in the mixture; and firing the coated insulator for about 30 to about 90 minutes in about one atmosphere of wet hydrogen at a temperature of from about 1450° to about 1520° C to cause the mixture to penetrate into the ceramic from a depth of from about one tenth millimeter to about three millimeters.
Claim 2
Independent Claim
149 words
A method for penetratingly covering an alumina ceramic insulator with metal so that the metal is diffused into the surface of the insulator a preselected amount, the method comprising: coating the insulator with a mixture comprising manganese powder and titanium powder, the manganese and titanium powder mixture ranging from about two parts by metal weight of manganese and five parts by metal weight of titanium to about seven parts by metal weight of manganese and one part by metal weight of titanium, the manganese and titanium together constituting essentially 100% of the metal present in the mixture; and firing the coated insulator for about 30 to about 90 minutes in about one atmosphere of wet hydrogen at a temperature of from about 1450° to about 1520° C to cause the mixture to penetrate into the ceramic from a depth of from about one tenth millimeter to about three millimeters.
Claim 3
Dependent Claim
28 words
The invention of claim 1 wherein the mixture comprises about four parts manganese powder by weight of metal and about three parts titanium hydroxide by weight of metal.
Claim 4
Dependent Claim
13 words
The invention of claim 1 wherein the manganese powder comprises MnO 2 .
Claim 5
Dependent Claim
13 words
The invention of claim 1 wherein the titanium powder comprises TiO 2 .
Claim 6
Dependent Claim
13 words
The invention of claim 1 wherein the titanium powder comprises TiH 2 .
Claim 7
Dependent Claim
17 words
The invention of claim 1 wherein said firing time is from about 40 to about 50 minutes.
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) | 1981-01-16 | 1981-07-18 | 1982-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-16 | 1985-07-18 | 1986-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-16 | 1989-07-18 | 1990-01-17 | $7700.00 | Window Closed / Lapsed |