US4788046A
Expired / Lapsed
US
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Method for producing materials for co-sintering
Assignee: CPS Technologies Corp
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Filing: 1987-08-13
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Granted: 1988-11-29
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Expires: 2007-08-13
Abstract
Abstract This invention relates to glass-ceramic packages for integrated circuits containing multi-layer, interconnected thick film wiring patterns obtained by co-sintering a glass-ceramic composite and copper, silver, palladium or gold based conductors at temperatures not exceeding about 1000 DEG C. The dielectric systems disclosed herein contains composites of borosilicate glasses and crystalline fillers which are fabricated by either mixing glass frit and the filler or by a sol-gel coating process.
Inventors
- 👤 Eric A. Barringer
- 👤 Sheldon I. Lieberman
- 👤 Mark S. Schmidt
- 👤 James D. Hodge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:48
CPC Classifications
C; C03; C03C; C03C14/00; C03C14/004; H; H10; H10W; H10W99/00; A; A61; A61B; A61B90/00; A61B90/20; C03C2214/00; C03C2214/04; C03C2214/08; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0306; H05K1/09; H05K1/092; H05K3/00; H05K3/46; H05K3/4644; H05K3/4673; H05K3/4676
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
99 words
A method of producing composite ceramic particles having a relatively low sintering temperature, comprising: (a) preparing a reagent solution including glassy compounds consisting essentially of calcium oxide, silicon dioxide, boron oxide, and optionally at least one of magnesium oxide and aluminum oxide; (b) mixing into the reagent solution a suspension of ceramic particles selected from the group consisting of alumina, spinel, cordierite, mullite, forsterite, quartz, spodumene, eucryptite, and mixtures thereof, to form a mixture; and (c) adding to the mixture of precipitating agent so that the glassy compounds precipitate onto and coat the ceramic particles, forming composite ceramic particles.
Claim 2
Independent Claim
99 words
A method of producing composite ceramic particles having a relatively low sintering temperature, comprising: (a) preparing a reagent solution including glassy compounds consisting essentially of calcium oxide, silicon dioxide, boron oxide, and optionally at least one of magnesium oxide and aluminum oxide; (b) mixing into the reagent solution a suspension of ceramic particles selected from the group consisting of alumina, spinel, cordierite, mullite, forsterite, quartz, spodumene, eucryptite, and mixtures thereof, to form a mixture; and (c) adding to the mixture of precipitating agent so that the glassy compounds precipitate onto and coat the ceramic particles, forming composite ceramic particles.
Claim 3
Dependent Claim
28 words
A method according to claim 1, wherein step (b) includes the step of mixing into the reagent solution a suspension of ceramic particles having a narrow size distribution.
Claim 4
Dependent Claim
23 words
A method according to claim 1, wherein step (b) includes the step of mixing into the reagent solution a suspension including alumina particles.
Claim 5
Dependent Claim
23 words
A method according to claim 1, wherein step (b) includes the step of mixing into the reagent solution a suspension including cordierite particles.
Claim 6
Dependent Claim
23 words
A method according to claim 1, wherein step (b) includes the step of mixing into the reagent solution a suspension including silica particles.
Claim 7
Dependent Claim
24 words
A method according to claim 1, wherein step (b) includes the step of mixing into the reagent solution a suspension including crystalline quartz particles.
Claim 8
Dependent Claim
14 words
A method according to claim 1, further including: (d) calcining the composite ceramic particles.
Claim 9
Dependent Claim
20 words
A method according to claim 7, wherein the step of calcining occurs at a temperature ranging from approximately 650°-800° C.
Claim 10
Dependent Claim
14 words
A method according to claim 7, wherein the calcined ceramic particles are subsequently milled.
Claim 11
Dependent Claim
61 words
The method as defined by claim 1, wherein the preparation of the reagent solution is effective to provide composite ceramic particles having a glassy phase consisting essentially of 20-57 wt. % alkaline earth oxides, of which calcium oxide comprises 50-100% and magnesium oxide comprises 0-50%, 23-40 wt. % silicon dioxide, 25-35 wt. % boron oxide, and 0-10 wt. % aluminum oxide.
Claim 12
Independent Claim
135 words
A method of producing a ceramic substrate sinterable at a relatively low temperature, comprising: (a) preparing a reagent solution including glassy compounds consisting essentially of calcium oxide, silicon dioxide, boron oxide, and optionally including at least one of magnesium (b) mixing into the reagent solution a suspension of ceramic oxide and aluminum oxide; particles selected form the group consisting of alumina, spinel, cordierite, forsterite, quartz, spodumene, eucryptite, and mixtures thereof, to form a mixture; (c) adding to the mixture a precipitating agent so that the glassy compounds precipitate onto and coat the ceramic particles; (d) separating the coated particles from the liquid; (e) drying the separated coated particles; (f) forming the dried coated particles into a green compact; and (g) firing the green compact at a relatively low sintering temperature to produce a ceramic substrate.
Claim 13
Independent Claim
135 words
A method of producing a ceramic substrate sinterable at a relatively low temperature, comprising: (a) preparing a reagent solution including glassy compounds consisting essentially of calcium oxide, silicon dioxide, boron oxide, and optionally including at least one of magnesium (b) mixing into the reagent solution a suspension of ceramic oxide and aluminum oxide; particles selected form the group consisting of alumina, spinel, cordierite, forsterite, quartz, spodumene, eucryptite, and mixtures thereof, to form a mixture; (c) adding to the mixture a precipitating agent so that the glassy compounds precipitate onto and coat the ceramic particles; (d) separating the coated particles from the liquid; (e) drying the separated coated particles; (f) forming the dried coated particles into a green compact; and (g) firing the green compact at a relatively low sintering temperature to produce a ceramic substrate.
Claim 14
Dependent Claim
21 words
A method according to claim 11, wherein the step of firing occurs at a temperature of less than approximately 1500° C.
Claim 15
Dependent Claim
20 words
A method according to claim 12, wherein the step of firing occurs at a temperature of less than approximately 1000°.
Claim 16
Dependent Claim
29 words
A method according to claim 11, wherein steps (a)-(g) are conducted in such a way so that the substrate has a thermal expansion coefficient of approximately 0.5-6×10 -6 /°C.
Claim 17
Dependent Claim
28 words
A method according to claim 11, further comprising the step of calcining the coated particles of step (e) prior to forming the coated particles into a green compact.
Claim 18
Dependent Claim
23 words
A method according to claim 15, further comprising the step of milling the calcined particles prior to forming them into a green compact.
Claim 19
Dependent Claim
28 words
A method according to claim 11, wherein step (b) includes the step of mixing into the reagent solution a suspension of ceramic particles having a narrow size distribution.
Claim 20
Dependent Claim
23 words
A method according to claim 11, wherein step (b) includes the step of mixing into the reagent solution a suspension including alumina particles.
Claim 21
Dependent Claim
23 words
A method according to claim 11, wherein step (b) includes the step of mixing into the reagent solution a suspension including cordierite particles.
Claim 22
Dependent Claim
23 words
A method according to claim 11, wherein step (b) includes the step of mixing into the reagent solution a suspension including silica particles.
Claim 23
Dependent Claim
24 words
A method according to claim 11, wherein step (b) includes the step of mixing into the reagent solution a suspension including crystalline quartz particles.
Claim 24
Dependent Claim
56 words
The method as defined by claim 11, wherein the preparation of the reagent solution is effective to provide glassy compounds consisting essentially of 20-57 wt. % alkaline earth oxides, of which calcium oxide comprises 50-100% and magnesium oxide comprises 0-50%, 23-40 wt. % silicon dioxide, 25-35 wt. % boron oxide, and 0-10 wt. % aluminum oxide.
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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) | 1991-11-29 | 1992-05-30 | 1992-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-29 | 1996-05-30 | 1996-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-29 | 2000-05-30 | 2000-11-29 | $7700.00 | Window Closed / Lapsed |