US5079194A
Expired / Lapsed
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Crystal growth inhibitor for glassy low dielectric inorganic composition
Assignee: Alcoa Corp
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Filing: 1990-10-11
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Granted: 1992-01-07
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Expires: 2010-10-11
Abstract
Abstract A ceramic composition for forming a ceramic dielectric body having a dielectric constant of less than about 4.2 and a TCE of less than about 4.0 ppm/c. The composition comprises a mixture of finely divided particles of 25-50 weight percent borosilicate glass and 50-75 weight percent high silica glass and 1-25 weight percent sufficient of crystalline ceramic material to inhibit the formation of crystalline forms of silica. The high silica glass contains essentially 0.5-1 wt. % alumina, 1-5 wt. % B 2 O and approximately 95-98 wt. % SiO 2 . The mixture is fired at a temperature of less than 1000° C.
Inventors
- 👤 Jau-Ho Jean
- 👤 Tapan K. Gupta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:36
CPC Classifications
H; H10; H10W; H10W70/00; H10W70/60; H10W70/67; H10W70/69; H10W70/692; C; C03; C03C; C03C14/00; C03C14/004; C03C8/00; C03C8/22; H01; H01B; H01B3/00; H01B3/02; H01B3/08; H01B3/085; H01B3/087; C03C2214/00; C03C2214/04; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0306; H05K3/00; H05K3/46; H05K3/4644; H05K3/4673; H05K3/4676
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
77 words
A ceramic composition for forming a ceramic dielectric body having a dielectric constant of less than about 4.2, said composition comprising a mixture of particles of: (a) 25-50 weight percent borosilicate glass; (b) 50-75 weight percent high silica glass comprising: 0-1 wt. % alumina, 3-4 wt. % B 2 O 3 , and 95-98 wt. % SiO 2 ; and (c) 1-25 weight percent of crystalline ceramic material to inhibit the formation of crystalline forms of silica.
Claim 2
Dependent Claim
77 words
A ceramic composition for forming a ceramic dielectric body having a dielectric constant of less than about 4.2, said composition comprising a mixture of particles of: (a) 25-50 weight percent borosilicate glass; (b) 50-75 weight percent high silica glass comprising: 0-1 wt. % alumina, 3-4 wt. % B 2 O 3 , and 95-98 wt. % SiO 2 ; and (c) 1-25 weight percent of crystalline ceramic material to inhibit the formation of crystalline forms of silica.
Claim 3
Dependent Claim
19 words
The ceramic composition of claim 1 in which said crystalline material is: 1-25 weight percent of a crystalline aluminosilicate.
Claim 4
Dependent Claim
74 words
The ceramic composition of claim 1 in which said crystalline material is: 1-25 weight percent of a material selected from the group of alumina, cordierite, mullite, magnesia, spinel, forsterite, steatite, aluminum phosphate (AlPO 4 ), aluminum nitride and aluminum titanate, barium oxide, titania, magnesium titanate, dolomite, anorthite, wollastonite, talc, sillmanite, silicon nitride, aluminum oxynitride, CaZrO 3 , AlN, MgO.Al 2 O 3 , ZnO.SiO 2 , ZrO 2 and ZrO 2 .SiO 2 .
Claim 5
Dependent Claim
53 words
The ceramic composition of claim 1 in which the borosilicate glass comprises: 0-3 wt. % alumina, 20-30 wt. % B 2 O 3 , 0-3 wt. % CaO, 0-3 wt. % K 2 O, 0-3 wt. % Li 2 O, 0-3 wt. % Na 2 O, and 60-80 wt. % SiO 2 .
Claim 6
Dependent Claim
24 words
The ceramic composition of claim 1 wherein the formed ceramic dielectric body has a thermal expansion coefficient in the range of about 3.0-4.0 /°C.
Claim 7
Dependent Claim
49 words
The ceramic composition of claim 1 in which said mixture is dispersed in an organic medium, said organic medium being 31-80% of the total weight of said mixture and said organic medium, said organic medium comprising: (a) 1-10 wt. % polyethylene glycol binder; and (b) 30-70 wt. % 1-propanol.
Claim 8
Dependent Claim
89 words
A castable ceramic composition having a dielectric constant of less than about 4.2, comprising: (a) mixture of 25-50 weight percent borosilicate glass and 50-75 weight percent high silica glass having the composition: 0-1 wt. % alumina; 3-4 wt. % B 2 O 2 , and 95-98 wt. % SiO 2 ; (b) 15-30 wt. % of an organic medium comprising: 1-10 wt. % polyethylene glycol binder; and 30-70 wt. % 1-propanol; and (c) 1-25 weight percent of crystalline ceramic material to inhibit the formation of crystalline forms of silica.
Claim 9
Dependent Claim
89 words
A castable ceramic composition having a dielectric constant of less than about 4.2, comprising: (a) mixture of 25-50 weight percent borosilicate glass and 50-75 weight percent high silica glass having the composition: 0-1 wt. % alumina; 3-4 wt. % B 2 O 2 , and 95-98 wt. % SiO 2 ; (b) 15-30 wt. % of an organic medium comprising: 1-10 wt. % polyethylene glycol binder; and 30-70 wt. % 1-propanol; and (c) 1-25 weight percent of crystalline ceramic material to inhibit the formation of crystalline forms of silica.
Claim 10
Dependent Claim
20 words
The castable ceramic composition of claim 7 in which said crystalline material is: 1-30 volume percent of a crystalline aluminosilicate.
Claim 11
Dependent Claim
73 words
The ceramic composition of claim 7 in which said crystalline material is: 1-25 percent of a material selected from the group of alumina, cordierite, mullite, magnesia, spinel, forsterite, steatite, aluminum phosphate (AlPO 4 ), aluminum nitride and aluminum titanate, barium oxide, titania, magnesium titanate, dolomite, anorthite, wollastonite, talc, sillmanite, silicon nitride, aluminum oxynitride, CaZrO 3 , AlN, MgO.Al 2 O 3 , ZnO.SiO 2 , ZrO 2 and ZrO 2 .SiO 2 .
Claim 12
Independent Claim
141 words
A method of making a ceramic dielectric body having a dielectric constant of less than about 4.2, comprising the steps of: (a) providing a mixture consisting essentially of finely divided particles comprising: i. 25-50 wt. % borosilicate glass comprising: 0-3 wt. % alumina, 20-30 wt. %, B 2 O 3 , 0-3 wt. % CaO, 0-3 wt. % K 2 O, 0-3 wt. % Li 2 O, 0-3 wt. % Na 2 O, and 60-80 wt. % SiO 2 ; and ii. 50-75 wt. % high silica glass comprising: 0-1 wt. % alumina, 3-4 wt. % B 2 O 3 , 95-98 wt. % SiO 2 , and iii. 1-25 weight percent of crystalline ceramic material to inhibit the formation of crystalline forms of silica; and (b) sintering the mixture in air to a temperature not greater than about 1000° C.
Claim 13
Independent Claim
141 words
A method of making a ceramic dielectric body having a dielectric constant of less than about 4.2, comprising the steps of: (a) providing a mixture consisting essentially of finely divided particles comprising: i. 25-50 wt. % borosilicate glass comprising: 0-3 wt. % alumina, 20-30 wt. %, B 2 O 3 , 0-3 wt. % CaO, 0-3 wt. % K 2 O, 0-3 wt. % Li 2 O, 0-3 wt. % Na 2 O, and 60-80 wt. % SiO 2 ; and ii. 50-75 wt. % high silica glass comprising: 0-1 wt. % alumina, 3-4 wt. % B 2 O 3 , 95-98 wt. % SiO 2 , and iii. 1-25 weight percent of crystalline ceramic material to inhibit the formation of crystalline forms of silica; and (b) sintering the mixture in air to a temperature not greater than about 1000° C.
Claim 14
Dependent Claim
63 words
The method of claim 10 in which said step of providing a mixture includes: (a) providing a mixture consisting essentially of finely divided particles comprising: 25-50 wt. % borosilicate glass, 50-75 wt. % high silica glass comprising: 0-1 wt. % alumina, 3-4 wt. % B 2 O 3 , 95-98 wt. % SiO 2 ; and 1-25 wt. % of a crystalline aluminosilicate.
Claim 15
Dependent Claim
117 words
The method of claim 10 in which said step of providing a mixture includes: providing a mixture consisting essentially of finely divided particles comprising: 25-50 wt. % borosilicate glass, 50-75 wt. % high silica glass comprising: 0-1 wt. % alumina, 3-4 wt. % B 2 O 3 , 95-98 wt. % SiO 2 , and 1-25 weight percent of a material selected from the group of alumina, cordierite, mullite, magnesia, spinel, forsterite, steatite, aluminum phosphate (AlPO 4 ), aluminum nitride and aluminum titanate, barium oxide, titania, magnesium titanate, dolomite, anorthite, wollastonite, talc, sillmanite, silicon nitride, aluminum oxynitride, CaZrO 3 , AlN, MgO.Al 2 O 3 , ZnO.SiO 2 , ZrO 2 and ZrO 2 .SiO 2 .
Claim 16
Dependent Claim
88 words
A ceramic composition for forming a ceramic dielectric body having a dielectric constant of less than about 4.2 and a thermal expansion coefficient of less than about 4.0 ppm/°C. said composition comprising a mixture of particles of: (a) 25-50 weight percent borosilicate glass; (b) 50-75 weight percent high silica glass comprising: 0-1 wt. % alumina, 3-4 wt. % B 2 O 3 , and 95-98 wt. % SiO 2 ; and (c) 1-25 weight percent of crystalline ceramic material to inhibit the formation of crystalline forms of silica.
Claim 17
Dependent Claim
88 words
A ceramic composition for forming a ceramic dielectric body having a dielectric constant of less than about 4.2 and a thermal expansion coefficient of less than about 4.0 ppm/°C. said composition comprising a mixture of particles of: (a) 25-50 weight percent borosilicate glass; (b) 50-75 weight percent high silica glass comprising: 0-1 wt. % alumina, 3-4 wt. % B 2 O 3 , and 95-98 wt. % SiO 2 ; and (c) 1-25 weight percent of crystalline ceramic material to inhibit the formation of crystalline forms of silica.
Claim 18
Dependent Claim
79 words
A ceramic composition for forming a ceramic dielectric body having a dielectric constant of less than about 4.2, said composition comprising a mixture of particles of: (a) 25-50 weight percent borosilicate glass; (b) 50-75 weight percent high silica glass comprising: 0-1 wt. % alumina, 3-4 wt. % B 2 O 3 , and 95-98 wt. % SiO 2 ; and (c) 1-25 weight percent of crystalline ceramic material selected from the group of alumina, cordierite, spinel and combinations therof.
Claim 19
Dependent Claim
79 words
A ceramic composition for forming a ceramic dielectric body having a dielectric constant of less than about 4.2, said composition comprising a mixture of particles of: (a) 25-50 weight percent borosilicate glass; (b) 50-75 weight percent high silica glass comprising: 0-1 wt. % alumina, 3-4 wt. % B 2 O 3 , and 95-98 wt. % SiO 2 ; and (c) 1-25 weight percent of crystalline ceramic material selected from the group of alumina, cordierite, spinel and combinations therof.
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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) | 1995-01-06 | 1995-07-08 | 1996-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-06 | 1999-07-08 | 2000-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-06 | 2003-07-08 | 2004-01-07 | $7700.00 | Window Closed / Lapsed |