US4471026A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ternary alloys in brazing ceramics
Assignee: United Kingdom Atomic Energy Authority
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Filing: 1982-11-03
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Granted: 1984-09-11
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Expires: 2002-11-03
Abstract
Abstract The invention relates to the use of ternary alloys in brazing ceramics. Brazing is a process of limited usefulness in the fabrication of ceramic components because of the inability of many alloys to wet industrially important ceramics. A possible solution is the metallizing of ceramics but this has technical and economic disadvantages. Alloys are known which wet ceramics but they do not necessarily give good bond strength. The following alloys have now been devised which both wet ceramics and give good bond strength, e.g., greater than 40 MNm-2 at room temperature, with unmetallized ceramics. The alloys are: Cu: 16 to 28 Ti: 6.5 to 14 Sn Cu: 15 to 25 Ti: 10 to 25 Au Cu: 15 to 50 Ti: 3 to 10 Ag Cu: 25 to 35 Ti: 3 to 8 In wherein the compositions are in atom percent.
Inventors
- 👤 Michael G. Nicholas
- 👤 Thomas M. Valentine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:38
CPC Classifications
C; C22; C22C; C22C9/00; B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/30; B23K35/302
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
71 words
An artefact comprising an unmetallized ceramic material bonded to a second material by means of a ternary alloy braze of Cu with Ti and either Au, Ag or In wherein the composition of the alloy in atom percent is in the range Cu: 15 to 25 Ti: 10 to 25 Au; or Cu: 15 to 50 Ti: 3 to 10 Ag; or Cu: 25 to 35 Ti: 3 to 8 In.
Claim 2
Dependent Claim
71 words
An artefact comprising an unmetallized ceramic material bonded to a second material by means of a ternary alloy braze of Cu with Ti and either Au, Ag or In wherein the composition of the alloy in atom percent is in the range Cu: 15 to 25 Ti: 10 to 25 Au; or Cu: 15 to 50 Ti: 3 to 10 Ag; or Cu: 25 to 35 Ti: 3 to 8 In.
Claim 3
Dependent Claim
13 words
An artefact according to claim 1 wherein the ceramic material is silicon carbide.
Claim 4
Dependent Claim
15 words
An artefact according to claim 2 wherein the silicon carbide is self bonded silicon carbide.
Claim 5
Dependent Claim
14 words
An artefact according to claim 3 wherein the second material is self-bonded silicon carbide.
Claim 6
Independent Claim
80 words
A method of bonding an unmetallized ceramic material to a second material which comprises brazing the ceramic material to the second material by means of a ternary alloy of Cu with Ti and either Au, Ag or In wherein the composition of the alloy in atom percent is in the range Cu: 15 to 25 Ti: 10 to 25 Au; or Cu: 15 to 50 Ti: 3 to 10 Ag; or Cu: 25 to 35 Ti: 3 to 8 In.
Claim 7
Independent Claim
80 words
A method of bonding an unmetallized ceramic material to a second material which comprises brazing the ceramic material to the second material by means of a ternary alloy of Cu with Ti and either Au, Ag or In wherein the composition of the alloy in atom percent is in the range Cu: 15 to 25 Ti: 10 to 25 Au; or Cu: 15 to 50 Ti: 3 to 10 Ag; or Cu: 25 to 35 Ti: 3 to 8 In.
Claim 8
Dependent Claim
15 words
A method according to claim 5 wherein the second material is an unmetallized ceramic material.
Claim 9
Dependent Claim
13 words
A method according to claim 5 wherein the ceramic material is silicon carbide.
Claim 10
Dependent Claim
15 words
A method according to claim 7 wherein the silicon carbide is self bonded silicon carbide.
Claim 11
Dependent Claim
15 words
A method according to claim 6 wherein each ceramic material is self bonded silicon carbide.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-09-11 | 1988-03-12 | 1988-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-09-11 | 1992-03-12 | 1992-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-09-11 | 1996-03-12 | 1996-09-11 | $7700.00 | Window Closed / Lapsed |