US4764341A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bonding of pure metal films to ceramics
Assignee: International Business Machines Corp
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Filing: 1987-04-27
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Granted: 1988-08-16
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Expires: 2007-04-27
Abstract
Abstract The bonding of nickel, cobalt, copper or any number of metals to oxide ceramics is achieved whereby the substrate and associated metallurgy are co-sintered. The invention teaches the use of an intermediary oxide such as Al2O3, Cr2O3, TiO2 or ZrO2 which will adhere to the substrate and in the presence of firing ambients form a complex ternary oxide with the overlying metal thereby creating the desired bond. The eutectic can be created during the firing cycle without the undesired consequence of oxidizing the metal. The so-called intermediary oxides can be oxidized in situ, deposited as oxides, or introduced into either the ceramic composition or the metal paste.
Inventors
- 👤 Philip L. Flaitz
- 👤 Raj N. Master
- 👤 Paul H. Palmateer
- 👤 Srinivasa S. N. Reddy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:39
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/50; C04B41/51; C04B41/52; C04B41/80; C04B41/81; C04B41/85; C04B41/88; C04B41/89; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0306; H05K3/00; H05K3/38; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12049; Y10T428/12056; Y10T428/12493; Y10T428/12535; Y10T428/12611; Y10T428/12618; Y10T428/31504; Y10T428/31536
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
27 words
A method of bonding metal to a first oxide comprising: forming a ternary oxide comprising said metal at the interface of said metal and said first oxide.
Claim 2
Independent Claim
27 words
A method of bonding metal to a first oxide comprising: forming a ternary oxide comprising said metal at the interface of said metal and said first oxide.
Claim 3
Dependent Claim
59 words
The method of claim 1, wherein said ternary oxide is formed by the steps comprising: providing a layer of an intermediary oxide between said metal and said first oxide, said intermediary oxide being chosen to interact with said metal to form a ternary oxide upon firing; and firing said structure at a temperature sufficient to create said ternary oxide.
Claim 4
Dependent Claim
26 words
The method of claim 1, wherein said metal is nickel and said ternary oxide comprises one of a group consisting of NiAl204, NiCr204, NiTiO3 and NiZrO3.
Claim 5
Dependent Claim
64 words
The method of claim 1 wherein said ternary oxide is formed by the steps comprising: providing an intermediary oxide to said metal, said intermediary oxide being chosen to form a ternary oxide with said metal upon firing; depositing said metal and intermediary oxide on said first oxide; firing said metal, intermediary oxide and first oxide to a temperature sufficient to create said ternary oxide.
Claim 6
Dependent Claim
63 words
The method of claim 1 wherein said ternary oxide is formed by the steps comprising: providing an intermediary oxide to said first oxide, said intermediary oxide chosen to form a ternary oxide with said metal upon firing; depositing said metal on said intermediary and first oxide; and firing said metal, intermediary and first oxide to a temperature sufficient to create said ternary oxide.
Claim 7
Dependent Claim
23 words
The method of claim 4 and 5 wherein said intermediary oxide is selected from the group consisting of Al203, Cr203, TiO2 and ZrO2.
Claim 8
Independent Claim
25 words
A method of bonding a metal to an oxide ceramic substrate comprising the steps of; forming a ternary oxide between said metal and said substrate.
Claim 9
Independent Claim
25 words
A method of bonding a metal to an oxide ceramic substrate comprising the steps of; forming a ternary oxide between said metal and said substrate.
Claim 10
Dependent Claim
15 words
The method of claim 7 wherein said ternary oxide is formed during high temperature firing.
Claim 11
Dependent Claim
61 words
The method of claim 7 wherein said forming of said ternary oxide comprises the steps of: providing an intermediary oxide to said metal said intermediary oxide being selected to form a ternary oxide with said metal upon high temperature firing; depositing said metal and intermediary oxide to said substrate; firing said structure at a temperature sufficient to form said ternary oxide.
Claim 12
Dependent Claim
56 words
The method of claim 7 wherein said forming of said ternary oxide comprises the steps of: providing an intermediary oxide to said substrate, said intermediary oxide being selected to form a ternary oxide with said metal upon firing; depositing said metal on said substrate; firing said structure at a temperature sufficient to form said ternary oxide.
Claim 13
Independent Claim
23 words
The method of claims 9 and 10 wherein said intermediary oxide is selected from a group consisting of Al203, Cr203, TiO2 and ZrO2.
Claim 14
Independent Claim
68 words
A method for fabricating a metallized ceramic substrate comprising the steps of: mixing a ceramic slurry; casting greensheets from said slurry; drying said greensheets; depositing metal on said greensheets; providing an intermediary oxide to said structure, said intermediary oxide being chosen to form a ternary oxide with said metal upon firing; and firing said metallized greensheets and thereby forming a ternary oxide between said metal and said ceramic.
Claim 15
Independent Claim
68 words
A method for fabricating a metallized ceramic substrate comprising the steps of: mixing a ceramic slurry; casting greensheets from said slurry; drying said greensheets; depositing metal on said greensheets; providing an intermediary oxide to said structure, said intermediary oxide being chosen to form a ternary oxide with said metal upon firing; and firing said metallized greensheets and thereby forming a ternary oxide between said metal and said ceramic.
Claim 16
Dependent Claim
27 words
The method of claim 12 wherein said providing of an intermediary oxide comprises the steps of; providing ternary compounds to said metal prior to said depositing step.
Claim 17
Dependent Claim
28 words
The method of claim 12 wherein said providing of an intermediary oxide comprises the steps of; providing an intermediary oxide to said metal prior to said depositing step.
Claim 18
Dependent Claim
25 words
The method of claim 12 wherein said providing of an intermediary oxide comprises the steps of; providing an intermediary oxide to said slurry during mixing.
Claim 19
Dependent Claim
33 words
A metallized oxide ceramic structure comprising; an oxide ceramic material; metal bonded to said ceramic material; and a ternary oxide between said oxide ceramic and said metal, said ternary oxide containing said metal.
Claim 20
Dependent Claim
33 words
A metallized oxide ceramic structure comprising; an oxide ceramic material; metal bonded to said ceramic material; and a ternary oxide between said oxide ceramic and said metal, said ternary oxide containing said metal.
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) | 1991-08-16 | 1992-02-15 | 1992-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-16 | 1996-02-15 | 1996-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-16 | 2000-02-15 | 2000-08-16 | $7700.00 | Window Closed / Lapsed |