US4906514A
Expired / Lapsed
US
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Metallized substrate for electronic device
Assignee: Corning Inc
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Filing: 1988-11-21
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Granted: 1990-03-06
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Expires: 2008-11-21
Abstract
Abstract Metallizing pastes, for forming thick film circuitry on low expansion substrates in electronic devices, are disclosed. The paste contains a glass powder that crystallizes on firing to a glass-ceramic in which lead titanate is the primary crystal phase.
Inventors
- 👤 Gaylord L. Francis
- 👤 Francis W. Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:18
CPC Classifications
C; C23; C23C; C23C28/00; H; H05; H05K; H05K1/00; H05K1/02; H05K1/09; H05K1/092; C03; C03C; C03C10/00; C03C10/0054; H10; H10W; H10W70/00; H10W70/60; H10W70/62; H10W70/66; H10W70/666; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24917; Y10T428/24926; Y10T428/25; Y10T428/256
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
75 words
An electrical component comprising a ceramic substrate, the ceramic being selected from the group composed of a modified cordierite composition glass-ceramic and aluminum nitride, and thick film circuitry on the substrate surface, the film being composed essentially of 82-98.5% of an electroconductive metal dispersed as a powder in a glass-ceramic matrix, the matrix containing lead titanate as its primary crystal phase whereby the coefficient of thermal expansion of the circuitry matches that of the substrate.
Claim 2
Dependent Claim
75 words
An electrical component comprising a ceramic substrate, the ceramic being selected from the group composed of a modified cordierite composition glass-ceramic and aluminum nitride, and thick film circuitry on the substrate surface, the film being composed essentially of 82-98.5% of an electroconductive metal dispersed as a powder in a glass-ceramic matrix, the matrix containing lead titanate as its primary crystal phase whereby the coefficient of thermal expansion of the circuitry matches that of the substrate.
Claim 3
Dependent Claim
16 words
An electrical component in accordance with claim 1 wherein the substrate is composed of aluminum nitride.
Claim 4
Dependent Claim
17 words
An electrical component in accordance with claim 1 wherein the substrate is a modified cordierite composition glass-ceramic.
Claim 5
Dependent Claim
16 words
An electrical component in accordance with claim 1 wherein the electroconductive metal is a palladium-silver mixture.
Claim 6
Dependent Claim
14 words
An electrical component in accordance with claim 1 wherein the electroconductive metal is copper.
Claim 7
Dependent Claim
16 words
An electrical component in accordance with claim 1 wherein the electroconductive metal content is about 90%.
Claim 8
Dependent Claim
79 words
An electrical component in accordance with claim 1 wherein the glass-ceramic matrix is composed essentially of, in percent by weight as calculated on an oxide basis from the glass batch, 60-80% PbO, at least 1% B 2 O 3 , at least 5% SiO 2 , the B 2 O 3 +SiO 2 being 10-20%, up to 20% of a divalent metal oxide selected from the group consisting of ZnO and BaO, and 0-2% Al 2 O 3 .
Claim 9
Dependent Claim
16 words
An electrical component in accordance with claim 7 wherein the selected divalent metal oxide is ZnO.
Claim 10
Dependent Claim
39 words
An electrical component in accordance with claim 7 wherein the glass-ceramic matrix is composed of 63% PbO, 10% ZnO, 7% B 2 O 3 , 7% SiO 2 , 12% TiO 2 and 1% Al 2 O 3 .
Claim 11
Dependent Claim
77 words
A metallizing paste composed of 82-98.5% of an electroconductive metal powder selected from the group composed of copper, a Pd-Ag mixture, and a noble metal mixed with 18-1.5% of a glass powder having a composition selected from the group composed of a lead-zinc-titanium-borosilicate family and a lead-barium-titanium-borosilicate family, the glass powder being capable of being thermally crystallized in situ to provide a lead titanate primary crystal phase, the mixed powders being blended into a temporary organic vehicle.
Claim 12
Dependent Claim
77 words
A metallizing paste composed of 82-98.5% of an electroconductive metal powder selected from the group composed of copper, a Pd-Ag mixture, and a noble metal mixed with 18-1.5% of a glass powder having a composition selected from the group composed of a lead-zinc-titanium-borosilicate family and a lead-barium-titanium-borosilicate family, the glass powder being capable of being thermally crystallized in situ to provide a lead titanate primary crystal phase, the mixed powders being blended into a temporary organic vehicle.
Claim 13
Dependent Claim
16 words
A metallizing paste in accordance with claim 10 wherein the metal powder is a Pd-Ag mixture.
Claim 14
Dependent Claim
14 words
A metallizing paste in accordance with claim 10 wherein the metal powder is copper.
Claim 15
Dependent Claim
19 words
A metallizing paste in accordance with claim 10 wherein the glass powder is about 10% of the metal-glass mixture.
Claim 16
Dependent Claim
81 words
A metallizing paste in accordance with claim 10 wherein the glass is composed essentially of, in percent by weight as calculated on an oxide basis from the batch, 60-80% PbO, at least 1% B 2 O 3 , at least 5% SiO 2 , the B 2 O 3 +SiO 2 being 10-20%, 5-18% TiO 2 , up to 20% of the divalent metal oxide selected from the group consisting of ZnO and BaO, and 0-2% Al 2 O 3 .
Claim 17
Dependent Claim
16 words
A metallizing paste in accordance with claim 14 wherein the selected divalent metal oxide is ZnO.
Claim 18
Dependent Claim
38 words
A metallizing paste in accordance with claim 14 wherein the glass is composed of 63% PbO, 10% ZnO, 7% B 2 O 3 , 7% SiO 2 , 12% TiO 2 and 1% Al 2 O 3 .
References Cited (Backward Citations)
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