US5031822A
Expired / Lapsed
US
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Methods of joining components
Assignee: PLESSY SEMICONDUCTORS Ltd
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Filing: 1990-01-30
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Granted: 1991-07-16
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Expires: 2010-01-30
Abstract
Abstract A method of brazing a silicon component to a molybdenum and/or tungsten component wherein prior to brazing the surface of the molybdenum and/or tungsten component is first provided with a thin gold coating and then a coating of palladium, platinum or rhodium. This allows satisfactory brazing to be effected using conventional aluminum-based brazes at temperatures below 650° C.
Inventors
- 👤 Giles Humpston
- 👤 David M. Jacobson
- 👤 Brian P. Cameron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:25
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/001; B23K35/005; H; H10; H10W; H10W70/00; H10W70/20; H10W70/24; H10W72/00; H10W72/071; H10W72/073; H10W72/07331; H10W72/07336; H10W72/30; H10W72/351; H10W72/352
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
116 words
A method of joining a first component which consists at least primarily of silicon to a second component which consists at least primarily of at least one of molybdenum and tungsten by brazing, comprising the steps of: prior to brazing, applying over the surface to be brazed of the second component a coating consisting substantially of gold between 0.2 and 1.0 micron thick, and applying over the gold coating a coating whose volume is between 0.5 and 5 volume % of the volume of the joint to be formed and which consists substantially of at least one of the metals palladium, platinum and rhodium; and carrying out the brazing at a temperature less than 650° C.
Claim 2
Independent Claim
116 words
A method of joining a first component which consists at least primarily of silicon to a second component which consists at least primarily of at least one of molybdenum and tungsten by brazing, comprising the steps of: prior to brazing, applying over the surface to be brazed of the second component a coating consisting substantially of gold between 0.2 and 1.0 micron thick, and applying over the gold coating a coating whose volume is between 0.5 and 5 volume % of the volume of the joint to be formed and which consists substantially of at least one of the metals palladium, platinum and rhodium; and carrying out the brazing at a temperature less than 650° C.
Claim 3
Dependent Claim
44 words
A method according to claim 1 wherein prior to the application of said coating of at least one of the metals palladium, platinum and rhodium, the gold coating is heat treated to cause it to diffuse partly into the material of the second component.
Claim 4
Dependent Claim
20 words
A method according to claim 2 wherein said gold coating is heat treated at a temperature of substantially 800° C.
Claim 5
Dependent Claim
39 words
A method according to claim 1 wherein said surface to be brazed of the second component comprises a surface of a nickel coating applied to said second component prior to application of the gold coating to the second component.
Claim 6
Dependent Claim
14 words
A method according to claim 1 wherein said coatings are formed by electro-plating processes.
Claim 7
Dependent Claim
16 words
A method according to claim 1 wherein brazing is carried out using an aluminium based braze.
Claim 8
Dependent Claim
15 words
A method according to claim 6 wherein brazing is carried out using an aluminium-silicon braze.
Claim 9
Dependent Claim
72 words
A method according to claim 5 wherein brazing is carried out using a braze having a composition in the composition quadrilateral defined by the points: 84.7wt % silver, 15.3wt % aluminium, 0 wt % germanium; 71.0 wt % silver, 29.0 wt % aluminium, 0 wt % germanium; 7.3 wt % silver, 87.8 wt % aluminium, 4.9 wt % germanium; and 0.7 wt % silver, 0.2 wt % aluminium, 99.1 wt % germanium.
Claim 10
Dependent Claim
39 words
A method according to claim 2 wherein said surface to be brazed of the second component comprises a surface of a nickel coating applied to said second component prior to application of the gold coating to the second component.
Claim 11
Dependent Claim
39 words
A method according to claim 3 wherein said surface to be brazed of the second component comprises a surface of a nickel coating applied to said second component prior to application of the gold coating to the second component.
Claim 12
Dependent Claim
14 words
A method according to claim 2 wherein said coatings are formed by electro-plating processes.
Claim 13
Dependent Claim
14 words
A method according to claim 3 wherein said coatings are formed by electro-plating processes.
Claim 14
Dependent Claim
14 words
A method according to claim 4 wherein said coatings are formed by electro-plating processes.
Claim 15
Dependent Claim
16 words
A method according to claim 2 wherein brazing is carried out using an aluminum based braze.
Claim 16
Dependent Claim
16 words
A method according to claim 3 wherein brazing is carried out using an aluminum based braze.
Claim 17
Dependent Claim
16 words
A method according to claim 4 wherein brazing is carried out using an aluminum based braze.
Claim 18
Dependent Claim
16 words
A method according to claim 5 wherein brazing is carried out using an aluminum based braze.
Claim 19
Dependent Claim
74 words
A method according to claim 2 wherein brazing is carried out using a braze having a composition in the composition quadrilateral defined by the points: 84.7 wt % silver, 15.3 wt % aluminum, 0 wt % germanium; 71.0 wt % silver, 29.0 wt % aluminum, 0 wt % germanium; 7.3 wt % silver, 87.8 wt % aluminum, 4.9 wt % germanium; and 0.7 wt % silver, 0.2 wt % aluminum, 99.1 wt % germanium.
Claim 20
Dependent Claim
74 words
A method according to claim 3 wherein brazing is carried out using a braze having a composition in the composition quadrilateral defined by the points: 84.7 wt % silver, 15.3 wt % aluminum, 0 wt % germanium; 71.0 wt % silver, 29.0 wt % aluminum, 0 wt % germanium; 7.3 wt % silver, 87.8 wt % aluminum, 4.9 wt % germanium; and 0.7 wt % silver, 0.2 wt % aluminum, 99.1 wt % germanium.
Claim 21
Dependent Claim
74 words
A method according to claim 4 wherein brazing is carried out using a braze having a composition in the composition quadrilateral defined by the points: 84.7 wt % silver, 15.3 wt % aluminum, 0 wt % germanium; 71.0 wt % silver, 29.0 wt % aluminum, 0 wt % germanium; 7.3 wt % silver, 87.8 wt % aluminum, 4.9 wt % germanium; and 0.7 wt % silver, 0.2 wt % aluminum, 99.1 wt % germanium.
Claim 22
Dependent Claim
74 words
A method according to claim 5 wherein brazing is carried out using a braze having a composition in the composition quadrilateral defined by the points: 84.7 wt % silver, 15.3 wt % aluminum, 0 wt % germanium; 71.0 wt % silver, 29.0 wt % aluminum, 0 wt % germanium; 7.3 wt % silver, 87.8 wt % aluminum, 4.9 wt % germanium; and 0.7 wt % silver, 0.2 wt % aluminum, 99.1 wt % germanium.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1994-07-15 | 1995-01-14 | 1995-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-15 | 1999-01-14 | 1999-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-15 | 2003-01-14 | 2003-07-16 | $7700.00 | Window Closed / Lapsed |