US4163074A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for fast adhesion of silver to nitride type ceramics
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1978-04-18
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Granted: 1979-07-31
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Expires: 1998-04-18
Abstract
Abstract A thin coating of silver is formed fast on the surface of a nitride type ceramic article by coating the surface of the ceramic article with a mixture consisting of copper sulfide and kaolin, subjecting the coated article to a thermal treatment in a nitrogen-containing atmosphere at a temperature in the range of from 900° to 1300° C., then overcoating the thermally treated ceramic article with silver carbonate and heating the overcoated article again in the nitrogen-containing atmosphere at a temperature in the range of from 700° to 900° C.
Inventors
- 👤 Yoshihiro Ebata
- 👤 Yasuo Toibana
- 👤 Tsuneo Uetsuki
- 👤 Saburo Kose
- 👤 Makoto Kinoshita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:33
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/52; C04B41/80; C04B41/81; C04B41/89
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
117 words
A method for fast adhesion of silver to a nitride type ceramic article, which comprises: coating the surface of the nitride type ceramic article with a mixture consisting of copper sulfide and kaolin, the mixing ratio of copper sulfide and kaolin being 99 to 80% by weight of the former to 1 to 20% by weight of the latter, heating the ceramic article coated with the mixture in a nitrogen-containing atmosphere at a temperature in the range of from 900° to 1300° C., overcoating the thermally treated ceramic article with silver carbonate, and heating the ceramic article overcoated with silver carbonate in a nitrogen-containing atmosphere at a temperature in the range of from 700° to 940° C.
Claim 2
Independent Claim
117 words
A method for fast adhesion of silver to a nitride type ceramic article, which comprises: coating the surface of the nitride type ceramic article with a mixture consisting of copper sulfide and kaolin, the mixing ratio of copper sulfide and kaolin being 99 to 80% by weight of the former to 1 to 20% by weight of the latter, heating the ceramic article coated with the mixture in a nitrogen-containing atmosphere at a temperature in the range of from 900° to 1300° C., overcoating the thermally treated ceramic article with silver carbonate, and heating the ceramic article overcoated with silver carbonate in a nitrogen-containing atmosphere at a temperature in the range of from 700° to 940° C.
Claim 3
Dependent Claim
27 words
The method according to claim 1, wherein the nitride type ceramic is one member selected from the group consisting of silicon nitride, aluminum nitride and boron nitride.
Claim 4
Dependent Claim
35 words
The method according to claim 1, wherein the nitrogen-containing atmosphere in which the thermal treatment of the nitride type ceramic article is carried out is air and nitrogen gas is blown onto the ceramic article.
Claim 5
Dependent Claim
26 words
The method according to claim 3, wherein the thermal treatment in the nitrogen-containing atmosphere is carried out for a period of from 3 to 30 minutes.
Claim 6
Dependent Claim
48 words
The method according to claim 1, wherein the amount of the mixture of copper sulfide and kaolin to be applied to coat the surface of the ceramic article is in the range of from 0.01 to 0.2 g per cm 2 of the surface of the ceramic article.
Claim 7
Dependent Claim
43 words
The method according to claim 1, wherein the amount of silver carbonate to be applied to overcoat the ceramic article is in the range of from 0.01 to 0.1 g as metallic silver per cm 2 of the surface of the ceramic article.
References Cited (Backward Citations)
GB954285A
Cited
JPS4721569U
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-07-30 | 1983-01-29 | 1983-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-30 | 1987-01-29 | 1987-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-30 | 1991-01-29 | 1991-07-31 | $7700.00 | Window Closed / Lapsed |