US3598435A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceramic-metal bonding composition and composite article of manufacture
Assignee: General Electric Co
•
Filing: 1968-11-14
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Granted: 1971-08-10
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Expires: 1988-11-14
Abstract
Abstract An improved seal or bond between a refractory metal body and a translucent alumina ceramic body is disclosed wherein the metal surface to be bonded to the alumina body is comprised of zirconium, either as a metallic coating thereon, diffused therein by ''''metalliding,'''' as an alloying constituent, or as the major constituent of the metal body. The bond is effected by means of an alumina glass between the zirconium present at the surface and the adjoining alumina ceramic surface, at least a portion of the zirconium being oxidized by the molten glass during the formation of the seal.
Inventors
- 👤 Paul J Jorgensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:59
CPC Classifications
C; C04; C04B; C04B37/00; C04B37/02; C04B37/023; C04B37/025; H; H01; H01J; H01J61/00; H01J61/02; H01J61/36; C04B2237/00; C04B2237/02; C04B2237/04; C04B2237/06; C04B2237/10; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/343; C04B2237/40; C04B2237/403; C04B2237/50; C04B2237/61; C04B2237/70; C04B2237/706; C04B2237/72; C04B2237/76; C04B2237/765; C04B2237/88; Y; Y10; Y10T; Y10T428/00; Y10T428/24
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
34 words
A ceramic-to-metal seal formed of a refractory metal body joined to a ceramic body by a sealing glass and wherein the metal-to-sealing glass interface comprises metallic zirconium and a sealing glass zirconium dioxide mixture.
Claim 2
Dependent Claim
34 words
A ceramic-to-metal seal formed of a refractory metal body joined to a ceramic body by a sealing glass and wherein the metal-to-sealing glass interface comprises metallic zirconium and a sealing glass zirconium dioxide mixture.
Claim 3
Dependent Claim
15 words
The seal recited in claim 1 wherein said sealing glass is composed primarily of alumina.
Claim 4
Dependent Claim
41 words
The seal recited in claim 1 wherein said refractory metal is selected from the group consisting of niobium, niobium alloyed with a small but effective amount of zirconium, zirconium and zirconium containing a small but effective amount of a stabilizing element.
Claim 5
Dependent Claim
13 words
The seal recited in claim 1 wherein said refractory metal body is niobium.
Claim 6
Dependent Claim
22 words
The seal recited in claim 1 wherein said refractory metal body is niobium alloyed with a small but effective amount of zirconium.
Claim 7
Dependent Claim
21 words
The seal recited in claim 1 wherein said refractory metal body is niobium having zirconium diffused therein at the metal-glass interface.
Claim 8
Dependent Claim
13 words
The seal recited in claim 1 wherein said refractory metal body is zirconium.
Claim 9
Dependent Claim
23 words
The seal recited in claim 1 wherein said refractory metal body is zirconium containing a small but effective amount of a stabilizing element.
Claim 10
Dependent Claim
21 words
The seal recited in claim 1 wherein said ceramic body is a polycrystalline alumina composed of at least 99.5 percent alumina.
Claim 11
Dependent Claim
15 words
The seal recited in claim 1 wherein said sealing glass is composed predominantly of alumina.
Claim 12
Dependent Claim
32 words
The ceramic-to-metal seal recited in claim 1 wherein said ceramic body comprises a polycrystalline ceramic body and said sealing glass mixture comprises a composition consisting essentially of zirconium dioxide and aluminA glass.
References Cited (Backward Citations)
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US2918596A
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US3138228A
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US3281174A
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US3385463A
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US3473071A
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US3389215A
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US3425116A
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US3441421A
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US3448319A
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US3473999A
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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) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |