US3893224A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing vacuum-tight seals between ceramic and alluminum components, evacuated envelopes incorporating the components sealed by said method, and vacuum tubes incorporating said envelopes
Assignee: Thales SA
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Filing: 1972-10-31
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Granted: 1975-07-08
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Expires: 1992-10-31
Abstract
Abstract A method of manufacturing vacuum-tight seals between ceramic and aluminium components: the two pieces to be sealed together, of ceramic (1) and aluminium (2), being tubular in form in the examples, are slid into one another, the insulating component (1) being lined over the full height (3) of the interfitting portion, with a metal deposit (4); the seal is produced by melting at a temperature of 580*C, the eutectic aluminium-silicon (89% Al 11% Si) bead (7).
Inventors
- 👤 Andre Besson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:51
CPC Classifications
H; H01; H01J; H01J5/00; H01J5/20; H01J5/22; C; C04; C04B; C04B37/00; C04B37/02; C04B37/023; C04B37/026; C04B2237/00; C04B2237/02; C04B2237/12; C04B2237/121; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/343; C04B2237/40; C04B2237/402; C04B2237/50; C04B2237/64; C04B2237/76; C04B2237/765; H01J2893/00; H01J2893/0033; H01J2893/0037
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
131 words
A METHOD OF MANUFACTURING VACUUM-TIGHT SEALS BETWEEN CERAMIC AND ALUMINIUM COMPONENTS, COMPRISING THE STEPS OF METALLIZING, THE CERAMIC COMPONENT OVER AT LEAST PART OF A CONTACT ZONE BETWEEN THE CERAMIC COMPONENT AND THE ALUMINIUM COMPONENT, POSITIONING THE ALUMINIUM COMPONENT ON THE CERAMIC COMPONENT, POSITIONING, AT THE JUNCTION BETWEEN THE TWO COMPONENTS, AN APPROPRIATE QUANTITY OF BRAZING SOLDER MADE OF A EUTETIC MIXTURE OF AL-SI CONTAINING 89% OF ALUMINIUM AND 11% OF SILICON, AND HEATING TO 580*C IN A CONTROLLED, REDUCING OR NEUTRAL ATMOSPHERE. VERTICALLY SPACED RECESSES OF A TOOL SLEEVE HOLDING THE DESIRED TOOL ARE ALIGNED WHEN THE TOOL SLEEVE IS CLAMPED BY SAID INTERMEDIATE TOOL TRANSFER DEVICE AND, SAID TOOL MAGAZINE IS RETRACTED SO THAT SAID TOOL SLEEVE TOGETHER WITH SAID DESIRED TOOL IS FREE TO PASS THROUGH SAID OPENING.
Claim 2
Independent Claim
131 words
A METHOD OF MANUFACTURING VACUUM-TIGHT SEALS BETWEEN CERAMIC AND ALUMINIUM COMPONENTS, COMPRISING THE STEPS OF METALLIZING, THE CERAMIC COMPONENT OVER AT LEAST PART OF A CONTACT ZONE BETWEEN THE CERAMIC COMPONENT AND THE ALUMINIUM COMPONENT, POSITIONING THE ALUMINIUM COMPONENT ON THE CERAMIC COMPONENT, POSITIONING, AT THE JUNCTION BETWEEN THE TWO COMPONENTS, AN APPROPRIATE QUANTITY OF BRAZING SOLDER MADE OF A EUTETIC MIXTURE OF AL-SI CONTAINING 89% OF ALUMINIUM AND 11% OF SILICON, AND HEATING TO 580*C IN A CONTROLLED, REDUCING OR NEUTRAL ATMOSPHERE. VERTICALLY SPACED RECESSES OF A TOOL SLEEVE HOLDING THE DESIRED TOOL ARE ALIGNED WHEN THE TOOL SLEEVE IS CLAMPED BY SAID INTERMEDIATE TOOL TRANSFER DEVICE AND, SAID TOOL MAGAZINE IS RETRACTED SO THAT SAID TOOL SLEEVE TOGETHER WITH SAID DESIRED TOOL IS FREE TO PASS THROUGH SAID OPENING.
Claim 3
Dependent Claim
19 words
A method as claimed in claim 1, characterized in that said ceramic component is constituted of 97% alumina, Al2O3.
Claim 4
Dependent Claim
30 words
A method according to claim 1 comprising the further steps of coating said brazing solder with an appropriate quantity of flux, and eliminating any residual flux after the heating step.
Claim 5
Dependent Claim
19 words
A method according to claim 1 comprising the step of introducing a collar in the vicinity of said junction.
References Cited (Backward Citations)
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US3006069A
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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) | 1978-07-07 | 1979-01-06 | 1979-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-07 | 1983-01-06 | 1983-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-07 | 1987-01-06 | 1987-07-08 | $7700.00 | Window Closed / Lapsed |