US5369067A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite substrates and their production
Assignee: Taiheiyo Cement Corp
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Filing: 1993-02-17
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Granted: 1994-11-29
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Expires: 2013-02-17
Abstract
Abstract A composite substrate is provided, which comprises a cordierite-anorthite-boron base composite material and has a microstructure with anorthite included in the cordierite phase. This substrate can be used in the form of a circuit substrate, because it has high-enough mechanical strength, a coefficient of thermal expansion close to that of silicon and a decreased dielectric constant and, moreover, can be sintered at a low temperature.
Inventors
- 👤 Morhudun G. M. U. Ismail
- 👤 Zenjiro Nakai
- 👤 Hiroshi Arai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:21
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/624; C04B35/01; C04B35/16; C04B35/18; C04B35/195; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0306
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
60 words
A method for producing a composite substrate which involves the steps of: mixing together a boehmite sol, a silica sol, a water-soluble magnesium salt and a water-soluble calcium salt to prepare a composite cordierite-anorthite composition sol, gelating said composition sol, calcining the obtained gel at from 800° C, to 1,100° C., and sintering the calcined gel to provide a composite.
Claim 2
Independent Claim
60 words
A method for producing a composite substrate which involves the steps of: mixing together a boehmite sol, a silica sol, a water-soluble magnesium salt and a water-soluble calcium salt to prepare a composite cordierite-anorthite composition sol, gelating said composition sol, calcining the obtained gel at from 800° C, to 1,100° C., and sintering the calcined gel to provide a composite.
Claim 3
Dependent Claim
35 words
A method as claimed in claim 1, wherein, in the composite sol-mixing step the water-soluble calcium salt is mixed in an amount of 1% to 10% by weight of said composition sol, calculated as CaO.
Claim 4
Dependent Claim
34 words
A method as claimed in claim 1, wherein, at the gelating step, boric acid is added to cordierite in an amount of 0.5 to 10% by weight, calculated as B 2 O 3 .
Claim 5
Dependent Claim
16 words
A method as claimed in claim 1, wherein calcination is at 850° C. to 900° C.
Claim 6
Dependent Claim
22 words
A method as claimed in claim 1, wherein a cordierite-anorthite composite material is obtained by sintering at 950° C. to 1,050° C.
Claim 7
Independent Claim
65 words
A method for producing a composite substrate which involves the steps of: mixing together a boehmite sol, a silica sol, a water-soluble magnesium salt and a water-soluble calcium salt to prepare a composite cordierite-anorthite sol, spraying and calcining said composite cordierite-anorthite sol, said calcining occurring at a temperature of 800° C. to 1,100° C. molding the resultant powders into a sheet, and sintering said sheet.
Claim 8
Independent Claim
65 words
A method for producing a composite substrate which involves the steps of: mixing together a boehmite sol, a silica sol, a water-soluble magnesium salt and a water-soluble calcium salt to prepare a composite cordierite-anorthite sol, spraying and calcining said composite cordierite-anorthite sol, said calcining occurring at a temperature of 800° C. to 1,100° C. molding the resultant powders into a sheet, and sintering said sheet.
Claim 9
Dependent Claim
36 words
A method as claimed in claim 6, wherein, at the composite: sol-preparing step, the water-soluble calcium salt is mixed in the cordierite-anorthite composite sol in an amount of 1 to 10% by weight, calculated as CaO.
Claim 10
Dependent Claim
40 words
A method as claimed in claim 6, wherein, at the composite sol-preparing step, the water-soluble boron compound is mixed in the cordierite-anorthite composite sol in an amount of 0.5 to 10% by weight, calculated as B 2 O 3 .
Claim 11
Dependent Claim
22 words
A method as claimed in claim 6, wherein, the sintering takes place at a temperature of 850° C. to 1,200 ° C.
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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) | 1997-11-28 | 1998-05-30 | 1998-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-11-28 | 2002-05-30 | 2002-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-11-28 | 2006-05-30 | 2006-11-29 | $7700.00 | Window Closed / Lapsed |