US4748086A
Expired / Lapsed
US
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Formation of copper electrode on ceramic oxide
Assignee: TDK Corp
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Filing: 1986-03-17
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Granted: 1988-05-31
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Expires: 2006-03-17
Abstract
Abstract A copper electrode is firmly bonded to a sintered ceramic oxide body by applying a first copper film on a ceramic oxide body by electroless plating or vapor phase plating such as evaporation or sputtering, forming a second copper film thereon by electrolytic plating, and heat treating the copper films on the body at a temperature of 750 DEG to 1065 DEG C. in a weakly oxidizing atmosphere.
Inventors
- 👤 Tetsuo Akoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 10:43
CPC Classifications
H; H05; H05K; H05K3/00; H05K3/38; C; C25; C25D; C25D5/00; C25D5/48; C25D5/50; H05K1/00; H05K1/02; H05K1/03; H05K1/0306; H05K2201/00; H05K2201/03; H05K2201/0332; H05K2201/0335; H05K2201/0347; H05K2203/00; H05K2203/11; H05K2203/1105; H05K3/10; H05K3/18; H05K3/181; H05K3/388
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
79 words
A method for forming a copper electrode on a ceramic oxide body, comprising: (a) forming a first copper film on a ceramic oxide body by electroless plating or vapor phase plating, (b) forming a second copper film on the first copper film by electrolytic plating, and (c) heat treating the resulting copper layer on the body at a temperature of 750° to 1065° C. in an inert gas atmosphere having an oxygen concentration of about 2 to 25 ppm.
Claim 2
Independent Claim
79 words
A method for forming a copper electrode on a ceramic oxide body, comprising: (a) forming a first copper film on a ceramic oxide body by electroless plating or vapor phase plating, (b) forming a second copper film on the first copper film by electrolytic plating, and (c) heat treating the resulting copper layer on the body at a temperature of 750° to 1065° C. in an inert gas atmosphere having an oxygen concentration of about 2 to 25 ppm.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein the first copper film has a thickness of about 0.2 to 1.0 μm.
Claim 4
Dependent Claim
25 words
The method of claim 1, wherein said first copper film and said second copper film together have a thickness of about 2 to 30 μm.
Claim 5
Dependent Claim
34 words
The method of claim 1, wherein said heat treatment is effected at a temperature of 750° to 1065° C. in an inert gas atmosphere having an oxygen concentration of about 6 to 10 ppm.
Claim 6
Dependent Claim
89 words
An article of manufacture, comprising a ceramic oxide body and a copper electrode formed thereon, said article being prepared by a method comprising: (a) forming a first copper film on a ceramic oxide body by electroless plating or vapor phase plating, (b) forming a second copper film on the first copper film by electrolytic plating, and (c) heat treating the resulting copper layer on the body at a temperature of 750° to 1065° C. in an inert gas atmosphere having an oxygen concentration of about 2 to 25 ppm.
Claim 7
Dependent Claim
89 words
An article of manufacture, comprising a ceramic oxide body and a copper electrode formed thereon, said article being prepared by a method comprising: (a) forming a first copper film on a ceramic oxide body by electroless plating or vapor phase plating, (b) forming a second copper film on the first copper film by electrolytic plating, and (c) heat treating the resulting copper layer on the body at a temperature of 750° to 1065° C. in an inert gas atmosphere having an oxygen concentration of about 2 to 25 ppm.
Claim 8
Dependent Claim
38 words
The article of claim 5 wherein the first copper film has a thickness of about 0.2 to 1.0 μm and said first and said second copper films together have a total thickness of about 2 to 30 μm.
Claim 9
Dependent Claim
57 words
The article of claim 5 wherein the ceramic oxide body is selected from the group consisting of a sintered aluminum oxide body, a sintered body comprised of BaTiO 3 , Nd 2 O 3 , Bi 2 O 3 , TiO 2 , and MnO, and a sintered body comprised of BaTiO 3 and SnO 2 .
Claim 10
Dependent Claim
28 words
The article of claim 5, wherein the ceramic oxide body is selected from the group consisting of a sintered aluminum oxide body and a sintered BaTiO 3 body.
Claim 11
Dependent Claim
34 words
The article of claim 5, wherein said heat treatment is effected at a temperature of 750° to 1065° C. in an inert gas atmosphere having an oxygen concentration of about 6 to 10 ppm.
Claim 12
Dependent Claim
31 words
The article of claim 5, wherein said ceramic oxide bodies are formed by mixing one or more of the respective oxides, shaping the mixture into a compact and sintering the compact.
Claim 13
Dependent Claim
22 words
The article of claim 10, wherein said compact is sintered by reaction sintering, atmospheric pressure sintering, hot pressing and hot isostatic pressing.
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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) | 1991-05-31 | 1991-11-30 | 1992-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-31 | 1995-11-30 | 1996-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-31 | 1999-11-30 | 2000-05-31 | $7700.00 | Window Closed / Lapsed |