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Patent US4493789A successfully refreshed from Google Patents.
US4493789A
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Electroconductive paste and process for producing electroconductive metallized ceramics using the same
Assignee: Resonac Corp
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Filing: 1983-03-08
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Granted: 1985-01-15
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Expires: 2003-03-08
Abstract
Abstract A highly electroconductive paste for metallizing comprising (a) a high-melting metal powder such as W, Mo, Mo-Mn, Pt, etc., powder, (b) an additive such as MgO, CaO, SiO2, Al2O3, etc., in an amount of 0.1 to 3 parts by weight per 100 parts by weight of the metal powder, (c) a binding agent, and (d) a solvent can give a highly electroconductive metallized ceramic having strongly bonded metallized layer by coating said paste on an alumina ceramic substrate and firing it.
Inventors
- 👤 Tamotsu Ueyama
- 👤 Takao Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:35
CPC Classifications
H; H05; H05K; H05K1/00; H05K1/02; H05K1/09; H05K1/092; B; B22; B22F; B22F3/00; B22F3/10; B22F3/1003; C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/50; C04B41/51; C04B41/80; C04B41/81; C04B41/85; C04B41/88; H01; H01B; H01B1/00; H01B1/20; H01B1/22; H10; H10D; H10D86/00; H10D86/80; H10D86/85
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
108 words
A highly electroconductive paste for metallizing comprising: (a) 100 parts by weight of high-melting point metal powder selected from the group consisting of tungsten powder, molybdenum powder, molybdenum-manganese powder, platinum powder and mixtures thereof, (b) 0.1 to 3 parts by weight of an additive which is one or more sintering promoters for alumina and alumina ceramics selected from the group consisting of magnesium oxide, calcium oxide, silicon oxide, aluminum oxide and mixtures thereof, and which can fill vacant spaces among particles of said metal powder and can shrink and condense said metal powder without proceeding sintering of said metal powder, (c) a binding agent, and (d) a solvent.
Claim 2
Dependent Claim
108 words
A highly electroconductive paste for metallizing comprising: (a) 100 parts by weight of high-melting point metal powder selected from the group consisting of tungsten powder, molybdenum powder, molybdenum-manganese powder, platinum powder and mixtures thereof, (b) 0.1 to 3 parts by weight of an additive which is one or more sintering promoters for alumina and alumina ceramics selected from the group consisting of magnesium oxide, calcium oxide, silicon oxide, aluminum oxide and mixtures thereof, and which can fill vacant spaces among particles of said metal powder and can shrink and condense said metal powder without proceeding sintering of said metal powder, (c) a binding agent, and (d) a solvent.
Claim 3
Dependent Claim
36 words
A highly electroconductive paste according to claim 1, wherein the binding agent (c) is a cellulose derivative resin, an acrylic resin, an alkyd and phenolic resin, a vinyl resin, an epoxy resin, or a mixture thereof.
Claim 4
Dependent Claim
26 words
A highly electroconductive paste according to claim 1, wherein the solvent (d) is an aromatic hydrocarbon, an ester, a ketone, an alcohol or a mixture thereof.
Claim 5
Dependent Claim
120 words
A process for producing a highly electroconductive paste for metallizing which comprises: dispersing uniformly, (a) 100 parts by weight of high-melting point metal powder selected from the group consisting of tungsten powder, molybdenum powder, molybdenum-manganese powder, platinum powder and mixtures thereof, (b) 0.1 to 3 parts by weight of an additive which is one or more sintering promoters for alumina and alumina ceramics selected from the group consisting of magnesium oxide, calcium oxide, silicon oxide, aluminum oxide and mixtures thereof, which can fill vacant spaces among particles of said metal powder and can shrink and condense said metal powder without proceeding sintering of said metal powder, and (c) a binding agent in (d) a solvent by using a mixing means.
Claim 6
Dependent Claim
120 words
A process for producing a highly electroconductive paste for metallizing which comprises: dispersing uniformly, (a) 100 parts by weight of high-melting point metal powder selected from the group consisting of tungsten powder, molybdenum powder, molybdenum-manganese powder, platinum powder and mixtures thereof, (b) 0.1 to 3 parts by weight of an additive which is one or more sintering promoters for alumina and alumina ceramics selected from the group consisting of magnesium oxide, calcium oxide, silicon oxide, aluminum oxide and mixtures thereof, which can fill vacant spaces among particles of said metal powder and can shrink and condense said metal powder without proceeding sintering of said metal powder, and (c) a binding agent in (d) a solvent by using a mixing means.
Claim 7
Dependent Claim
90 words
A process for producing a highly electroconductive metallized ceramic which comprises coating on the surface of alumina ceramic substrate a highly electroconductive paste for metallizing comprising (a) 100 parts by weight of high-melting point metal powder, (b) 0.1 to 3 parts by weight of an additive which can fill vacant spaces among particles of said metal powder and can shrink and condense said metal powder without proceeding sintering of said metal powder, (c) a binding agent, and (d) a solvent, and firing said electroconductive paste to form a metallized layer.
Claim 8
Dependent Claim
90 words
A process for producing a highly electroconductive metallized ceramic which comprises coating on the surface of alumina ceramic substrate a highly electroconductive paste for metallizing comprising (a) 100 parts by weight of high-melting point metal powder, (b) 0.1 to 3 parts by weight of an additive which can fill vacant spaces among particles of said metal powder and can shrink and condense said metal powder without proceeding sintering of said metal powder, (c) a binding agent, and (d) a solvent, and firing said electroconductive paste to form a metallized layer.
Claim 9
Dependent Claim
16 words
A process according to claim 5, wherein the firing temperature is 1400° C. to 1700° C.
Claim 10
Dependent Claim
18 words
A process according to claim 5 or 6, wherein the alumina ceramic substrate is an unsintered alumina ceramic.
Claim 11
Dependent Claim
18 words
A process according to claim 5 or 6, wherein the firing is conducted under a weakly reductive atmosphere.
Claim 12
Dependent Claim
26 words
A process according to claim 5, wherein the high-melting point metal powder (a) is tungsten powder, molybdenum powder, molybdenum-manganese powder, platinum powder, or a mixture thereof.
Claim 13
Dependent Claim
21 words
A process according to claim 5, wherein the additive (b) is one or more sintering promoters for alumina and alumina ceramics.
Claim 14
Dependent Claim
23 words
A process according to claim 5, wherein the additive (b) is magnesium oxide, calcium oxide, silicon oxide, aluminum oxide or a mixture thereof.
Claim 15
Dependent Claim
29 words
A highly electroconductive paste according to claim 1, wherein the high-melting point powder is selected from the group consisting of tungsten powder, molybdenum powder, molybdenum-manganese powder and mixtures thereof.
Claim 16
Dependent Claim
19 words
A highly electroconductive paste according to claim 12, wherein the particle size of said metal powder is 0.3-8 μm.
Claim 17
Dependent Claim
27 words
A highly electroconductive paste according to claim 12, which consists essentially of said metal powder (a), said additive (b), said binding agent (c) and said solvent (d).
Claim 18
Dependent Claim
16 words
A highly electroconductive paste according to claim 12, wherein said metal powder (a) is tungsten powder.
Claim 19
Dependent Claim
28 words
A process according to claim 4, wherein the high-melting point metal powder is selected from the group consisting of tungsten powder, molybdenum powder, molybdenum-manganese powder and mixtures thereof.
Claim 20
Dependent Claim
14 words
A process according to claim 16, wherein said metal powder (a) is tungsten powder.
Claim 21
Dependent Claim
68 words
A highly electroconductive paste for metallizing comprising: (a) 100 parts by weight of high-melting point metal powder selected from the group consisting of tungsten powder, molybdenum powder, molybdenum-manganese powder, and mixtures thereof, (b) 0.1 to 3 parts by weight of an additive which can fill vacant spaces among particles of said metal powder without proceeding sintering of said metal powder, (c) a binding agent, and (d) a solvent.
Claim 22
Dependent Claim
68 words
A highly electroconductive paste for metallizing comprising: (a) 100 parts by weight of high-melting point metal powder selected from the group consisting of tungsten powder, molybdenum powder, molybdenum-manganese powder, and mixtures thereof, (b) 0.1 to 3 parts by weight of an additive which can fill vacant spaces among particles of said metal powder without proceeding sintering of said metal powder, (c) a binding agent, and (d) a solvent.
Claim 23
Dependent Claim
17 words
A highly electroconductive paste according to claim 18, wherein the high-melting point metal powder is tungsten powder.
Claim 24
Dependent Claim
17 words
A highly electroconductive paste according to claim 18, wherein the high-melting point metal powder is molybdenum powder.
Claim 25
Dependent Claim
17 words
A highly electroconductive paste according to claim 18, wherein the high-melting point metal powder is molybdenum-manganese powder.
Claim 26
Dependent Claim
24 words
A highly electroconductive paste according to claim 18, wherein the additive (b) is selected from the group consisting of chromium oxide and titanium oxide.
Claim 27
Dependent Claim
89 words
A process for producing a highly electroconductive paste for metallizing which comprises: dispersing uniformly, (a) 100 parts by weight of high-melting point metal powder selected from the group consisting of tungsten powder, molybdenum powder, molybdenum-manganese powder, and mixtures thereof, (b) 0.1 to 3 parts by weight of an additive which can fill vacant spaces among particles on said metal powder and can shrink and condense said metal powder without proceeding sintering of said metal powder, and (c) a binding agent in (d) a solvent by using a mixing means.
Claim 28
Dependent Claim
89 words
A process for producing a highly electroconductive paste for metallizing which comprises: dispersing uniformly, (a) 100 parts by weight of high-melting point metal powder selected from the group consisting of tungsten powder, molybdenum powder, molybdenum-manganese powder, and mixtures thereof, (b) 0.1 to 3 parts by weight of an additive which can fill vacant spaces among particles on said metal powder and can shrink and condense said metal powder without proceeding sintering of said metal powder, and (c) a binding agent in (d) a solvent by using a mixing means.
Claim 29
Dependent Claim
16 words
A process according to claim 6, wherein the alumina ceramic substrate is an unsintered alumina ceramic.
Claim 30
Dependent Claim
16 words
A process according to claim 6, wherein the firing is conducted under a weakly reductive atmosphere.
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) | 1988-01-15 | 1988-07-16 | 1989-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-15 | 1992-07-16 | 1993-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-15 | 1996-07-16 | 1997-01-15 | $7700.00 | Window Closed / Lapsed |