US4230773A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Decreasing the porosity and surface roughness of ceramic substrates
Assignee: International Business Machines Corp
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Filing: 1978-12-04
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Granted: 1980-10-28
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Expires: 1998-12-04
Abstract
Abstract The porosity and surface roughness of ceramic substrates are improved by coating the surface with silicon compounds, drying the coated substrate, and then subjecting the substrate to elevated temperature so as to convert the silicon compounds to silicon oxides. Coated substrates obtained by the above process as well as specific preferred organosilane compositions are provided.
Inventors
- 👤 Peter Bakos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:26
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/50; C04B41/5025; C04B41/5035; C04B41/80; C04B41/81; C04B41/85; C04B41/87; H; H10; H10W; H10W99/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
93 words
A method for reducing the porosity and surface roughness of a ceramic substrate which comprises applying a liquid coating composition containing at least one nonpolymeric silicon compound selected from the group of organosilanes, silicon halides, or mixtures thereof to at least one surface of said substrate; drying the coated substrate; and exposing the dried coated substrate to an elevated temperature higher than that employed in the drying of the coated substrate to thereby convert the nonpolymeric silicon compound to silicon oxides, and thereby obtaining a ceramic substrate having reduced porosity and surface roughness.
Claim 2
Independent Claim
93 words
A method for reducing the porosity and surface roughness of a ceramic substrate which comprises applying a liquid coating composition containing at least one nonpolymeric silicon compound selected from the group of organosilanes, silicon halides, or mixtures thereof to at least one surface of said substrate; drying the coated substrate; and exposing the dried coated substrate to an elevated temperature higher than that employed in the drying of the coated substrate to thereby convert the nonpolymeric silicon compound to silicon oxides, and thereby obtaining a ceramic substrate having reduced porosity and surface roughness.
Claim 3
Dependent Claim
21 words
The method of claim 1 wherein the ceramic substrate is selected from the group of silicon oxides, silicates, and aluminum oxides.
Claim 4
Dependent Claim
19 words
The method of claim 1 wherein said ceramic substrate has a surface roughness of at least about 10 microns.
Claim 5
Dependent Claim
27 words
The method of claim 1 wherein the silicon compound is selected from the group of saturated organosilicon compounds, ethylenically unsaturated organosilicon compounds, silicon halides, and mixtures thereof.
Claim 6
Dependent Claim
15 words
The method of claim 1 wherein said coating composition contains at least one liquid organosilane.
Claim 7
Dependent Claim
17 words
The method of claim 1 wherein said coating composition contains at least one ethylenically unsaturated organosilicon compound.
Claim 8
Dependent Claim
23 words
The method of claim 1 wherein said coating composition contains at least one ethylenically organosilicon compound and at least one saturated organosilicon compound.
Claim 9
Dependent Claim
63 words
The method of claim 1 wherein said coating composition contains about 45 to about 95% by weight of at least one saturated organosilicon compound and about 5 to about 55% by weight of at least one ethylenically unsaturated organosilicon compound, wherein the above percents by weight are based upon the total of the saturated organosilicon compound and unsaturated organosilicon compound in the composition.
Claim 10
Dependent Claim
30 words
The method of claim 8 wherein said composition contains beta(3,4-epoxycyclohexyl)ethyl trimethoxysilane and an ethylenically unsaturated organosilicon compound selected from the group of vinyltrichlorosilane, vinyltriethoxysilane, vinyltris (2-methoxyethoxy)silane, vinyltriacetoxysilane, and mixtures thereof.
Claim 11
Dependent Claim
11 words
The method of claim 9 wherein said composition further contains aminopropyltrimethoxysilane.
Claim 12
Dependent Claim
14 words
The method of claim 1 wherein said coating composition also includes an organic diluent.
Claim 13
Dependent Claim
44 words
The method of claim 11 wherein said organic diluent is present in the composition in amounts from about 25 to about 90% by weight wherein the above weight percents are based upon the total of the diluent and silicon compounds present in the composition.
Claim 14
Dependent Claim
13 words
The method of claim 1 wherein said coating composition also contains a stabilizer.
Claim 15
Dependent Claim
35 words
The method of claim 1 wherein said stabilizer is present in an amount of about 2.5 to about 7% by weight based upon the amount of organosilicon compound, diluent, and stabilizer present in the composition.
Claim 16
Dependent Claim
10 words
The method of claim 14 wherein said stabilizer is piperidene.
Claim 17
Dependent Claim
26 words
The method of claim 1 wherein said coating composition is applied at a wet thickness of up to about 0.1 mm in a single coating step.
Claim 18
Dependent Claim
11 words
The method of claim 1 wherein multiple coating applications are employed.
Claim 19
Dependent Claim
21 words
The method of claim 1 wherein the coated substrate is dried at a temperature of about 50° to about 200° C.
Claim 20
Dependent Claim
16 words
The method of claim 18 wherein said drying takes about 30 minutes to about 2 hours.
Claim 21
Dependent Claim
16 words
The method of claim 1 wherein said elevated temperature is about 500° to about 1700° C.
Claim 22
Dependent Claim
16 words
The method of claim 1 wherein said elevated temperature is about 700° to about 1300° C.
Claim 23
Dependent Claim
24 words
The method of claim 20 wherein the exposing of the dry coated substrate to said elevated temperature requires about 2 to about 6 hours.
Claim 24
Dependent Claim
19 words
The method of claim 1 wherein the exposure to said elevated temperatures is conducted in the presence of air.
Claim 25
Dependent Claim
33 words
The method of claim 1 wherein said substrate is a substrate for integrated circuit modules and which further includes subsequently coating the ceramic substrate of reduced porosity and surface roughness with metallic circuitry.
Claim 26
Dependent Claim
16 words
A ceramic substrate of reduced porosity and surface roughness obtained by the process of claim 1.
Claim 27
Dependent Claim
44 words
The method of claim 11 wherein said organic diluent is present in the composition in an amount of at least about 25% by weight wherein the above weight percents are based upon the total of the diluent and silicon compounds present in the composition.
Claim 28
Dependent Claim
76 words
The method of claim 8 wherein said coating composition is applied at a wet thickness of up to about 0.1 mm in a single coating step; said coated substrate is dried at a temperature of about 50° to about 200° C., said elevated temperature is about 700° to about 1300° C., said exposure to elevated temperatures is conducted in the presence of air, and said ceramic substrate has a surface roughness of at about 10 micron.
Claim 29
Dependent Claim
29 words
The method of claim 27 wherein said composition contains beta(3,4-epoxycyclohexyl)ethyl trimethoxysilane and an ethylenically unsaturated organosilicon compound selected from the group of vinyltrichlorosilane, vinyltriethoxysilane, vinyltris(2-methoxyethoxy)silane, vinyltriacetoxysilane, and mixtures thereof.
Claim 30
Dependent Claim
11 words
The method of claim 28 wherein said composition further contains aminopropyltrimethoxysilane.
Claim 31
Dependent Claim
11 words
The method of claim 27 wherein multiple coating applications are employed.
Claim 32
Dependent Claim
33 words
The method of claim 27 wherein said substrate is a substrate for integrated circuit modules and which further includes subsequently coating the ceramic substrate of reduced porosity and surface roughness with metallic circuitry.
Claim 33
Dependent Claim
16 words
A ceramic substrate of reduced porosity and surface roughness obtained by the process of claim 27.
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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) | 1983-10-28 | 1984-04-28 | 1984-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-28 | 1988-04-28 | 1988-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-28 | 1992-04-28 | 1992-10-28 | $7700.00 | Window Closed / Lapsed |