US4598025A
Expired / Lapsed
US
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Ductile composite interlayer for joining by brazing
Assignee: Osram Sylvania Inc
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Filing: 1985-07-19
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Granted: 1986-07-01
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Expires: 2005-07-19
Abstract
Abstract A ceramic part is joined to a metal part by means of a molybdenum copper composite interlayer disposed between, and brazed to, the ceramic part and the metal part.
Inventors
- 👤 Howard Mizuhara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:13
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/001; B23K35/004; C; C03; C03C; C03C27/00; C03C27/04; C03C27/042; C03C27/046; C04; C04B; C04B37/00; C04B37/02; C04B37/023; C04B37/026; C04B2235/00; C04B2235/65; C04B2235/658; C04B2235/6582; C04B2237/00; C04B2237/02; C04B2237/12; C04B2237/122; C04B2237/123; C04B2237/125; C04B2237/126; C04B2237/127; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/343; C04B2237/345; C04B2237/348; C04B2237/36; C04B2237/368; C04B2237/40; C04B2237/405; C04B2237/406; C04B2237/50; C04B2237/70; C04B2237/706; C04B2237/708; C04B2237/72; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12576; Y10T428/12597; Y10T428/12611; Y10T428/12618; Y10T428/12771; Y10T428/12806; Y10T428/12812; Y10T428/12826; Y10T428/12861; Y10T428/12903; Y10T428/1291
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
90 words
A ceramic part joined to a metal part by means of a molybdenum copper composite interlayer therebetween, the composite being prepared by the steps of blending molybdenum powder with copper powder, forming the blend into a shape, and densifying the blend by sintering and being brazed using a brazing alloy to both the ceramic part and the metal part, the coefficient of thermal expansion of the composite being closer to the coefficient of thermal expansion of the ceramic part than to the coefficient of thermal expansion of the metal part.
Claim 2
Dependent Claim
90 words
A ceramic part joined to a metal part by means of a molybdenum copper composite interlayer therebetween, the composite being prepared by the steps of blending molybdenum powder with copper powder, forming the blend into a shape, and densifying the blend by sintering and being brazed using a brazing alloy to both the ceramic part and the metal part, the coefficient of thermal expansion of the composite being closer to the coefficient of thermal expansion of the ceramic part than to the coefficient of thermal expansion of the metal part.
Claim 3
Dependent Claim
22 words
The jointure of claim 1 wherein the molybdenum copper composite comprises a monolith made by powder metallurgy process and densified by sintering.
Claim 4
Dependent Claim
37 words
The jointure of claim 1 wherein the metal part is ductile iron and the braze between the composite and the metal part comprises a brazing alloy composed of silver, copper and indium or silver, copper and titanium.
Claim 5
Dependent Claim
29 words
The jointure of claim 1 wherein the ceramic part comprises alumina or silicon nitride and the braze between the composite and the ceramic part comprises silver, copper and titanium.
Claim 6
Dependent Claim
29 words
The jointure of claim 1 wherein the ceramic part comprises partially stabilized zirconia and the braze between the composite and the ceramic part comprises silver, copper, indium and titanium.
Claim 7
Independent Claim
89 words
The method of joining a ceramic part to a metal part comprising the steps of preparing a densified molybdenum copper composite having a coefficient of thermal expansion closer to that of the ceramic part than to that of the metal part, disposing the composite between the ceramic part and the metal part, and brazing the composite to both the ceramic part and the metal part said composite being prepared by the steps of blending molybdenum powder with copper powder, forming the blend into a shape, and densifying by sintering.
Claim 8
Independent Claim
89 words
The method of joining a ceramic part to a metal part comprising the steps of preparing a densified molybdenum copper composite having a coefficient of thermal expansion closer to that of the ceramic part than to that of the metal part, disposing the composite between the ceramic part and the metal part, and brazing the composite to both the ceramic part and the metal part said composite being prepared by the steps of blending molybdenum powder with copper powder, forming the blend into a shape, and densifying by sintering.
Claim 9
Dependent Claim
16 words
The method of claim 6 including the step of nickel plating the composite prior to brazing.
Claim 10
Dependent Claim
53 words
The method of claim 6 including the steps of forming an assembly of the composite between the ceramic part and the metal part with a reactive metal brazing alloy preform between the ceramic part and the composite, and a brazing alloy preform between the metal part and the composite, and brazing the assembly.
References Cited (Backward Citations)
US3787958A
Cited
US4426033A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-30 | 1989-12-30 | 1990-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-30 | 1993-12-30 | 1994-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-30 | 1997-12-30 | 1998-07-01 | $7700.00 | Window Closed / Lapsed |