US3969126A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brazing mixture for forming a corrosion-resistant vacuum-tight seal between a ceramic body and a refractory metal
Assignee: Varian Medical Systems Inc
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Filing: 1974-10-17
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Granted: 1976-07-13
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Expires: 1994-10-17
Abstract
Abstract An alkali metal corrosion resistant vacuum tight metal-to-ceramic seal is formed between a high alumina ceramic body and a refractory alkali metal resistant metal member, such as Cb-1Zr, by interposing a powdered brazing mixture comprising by weight a majority of elemental columbium powder and a second metal powder selected from the class consisting of iron and nickel, and firing the assembly in vacuum at a temperature between 1500°C and 1675°C to partially melt a portion of the powder to form a melted bonding phase component interstitially of the undissolved columbium particles for bonding the ceramic to the metal part.
Inventors
- 👤 Norman C. Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:32
CPC Classifications
C; C04; C04B; C04B37/00; C04B37/02; C04B37/023; C04B37/026; B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/32; C04B2237/00; C04B2237/02; C04B2237/12; C04B2237/122; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/343; C04B2237/40; C04B2237/403; C04B2237/50; C04B2237/72
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
66 words
A brazing mixture comprising a volatile vehicle in which is suspended a powdered mixture, said volatile vehicle consisting essentially of a methyl methacrylate based lacquer, and said powdered mixture consisting essentially of columbium powder and a second metal powder, said columbium powder constituting the major part by weight of said powdered mixture, and said second powder being selected from a class consisting of iron and nickel.
Claim 2
Dependent Claim
66 words
A brazing mixture comprising a volatile vehicle in which is suspended a powdered mixture, said volatile vehicle consisting essentially of a methyl methacrylate based lacquer, and said powdered mixture consisting essentially of columbium powder and a second metal powder, said columbium powder constituting the major part by weight of said powdered mixture, and said second powder being selected from a class consisting of iron and nickel.
Claim 3
Dependent Claim
18 words
The brazing mixture of claim 1 wherein said columbium powder comprises elemental columbium particles of -325 mesh size.
Claim 4
Dependent Claim
18 words
The brazing mixture of claim 1 wherein said second metal powder comprises iron particles of -325 mesh size.
Claim 5
Dependent Claim
18 words
The brazing mixture of claim 1 wherein said second metal powder comprises nickel particles of -100 mesh size.
Claim 6
Dependent Claim
18 words
The brazing mixture of claim 1 wherein said second metal powder comprises substantially 17% iron powder by weight.
Claim 7
Dependent Claim
18 words
The brazing mixture of claim 1 wherein said second metal powder comprises substantially 15% nickel powder by weight.
References Cited (Backward Citations)
US2461410A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-13 | 1980-01-12 | 1980-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-13 | 1984-01-12 | 1984-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-13 | 1988-01-12 | 1988-07-13 | $7700.00 | Window Closed / Lapsed |