US4900703A
Expired / Lapsed
US
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Method for producing ceramics with thermal shock resistance
Assignee: Panasonic Holdings Corp
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Filing: 1988-11-02
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Granted: 1990-02-13
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Expires: 2008-11-02
Abstract
Abstract A ceramic having improved thermal shock resistance is produced by a method comprising firing a mixture comprising at least one compound selected from the group consisting of a sulfate, nitrate, carbonate, oxide, hydroxide, acetate and oxalate of an alkali metal or an alkaline earth metal, titanium oxide, rehydratable alumina, optionally silica and optionally a rare earth element compound at a temperature in the range of 1,000 DEG C. to 1,300 DEG C.
Inventors
- 👤 Yukiyoshi Ono
- 👤 Atsushi Nishino
- 👤 Yasuhiro Takeuchi
- 👤 Hironao Numoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:07
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/14; B; B01; B01J; B01J23/00; B01J23/02; C04B35/16; C04B35/18; C04B35/195; C04B35/46; C04B35/462; C04B35/478; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
126 words
A method for producing a ceramic which comprises firing a mixture comprising at least one compound selected from the group consisting of the sulfate, nitrate, carbonate, oxide, hydroxide, acetate and oxalate of an alkali metal or an alkaline earth metal, titanium oxide and rehydratable alumina, wherein the mixing ratio of the alkali metal or alkaline earth metal compound and titanium oxide is such that 0.1 to 4 gram atoms of titanium as titanium oxide are present per gram atom of the alkali or alkaline earth metal in the metal compound, and the weight ratio of titanium oxide to the rehydratable alumina is from 1:1 to 1:10, at a temperature in the range of 1,000° C. to 1,300° C. for a time sufficient to produce said ceramic.
Claim 2
Independent Claim
126 words
A method for producing a ceramic which comprises firing a mixture comprising at least one compound selected from the group consisting of the sulfate, nitrate, carbonate, oxide, hydroxide, acetate and oxalate of an alkali metal or an alkaline earth metal, titanium oxide and rehydratable alumina, wherein the mixing ratio of the alkali metal or alkaline earth metal compound and titanium oxide is such that 0.1 to 4 gram atoms of titanium as titanium oxide are present per gram atom of the alkali or alkaline earth metal in the metal compound, and the weight ratio of titanium oxide to the rehydratable alumina is from 1:1 to 1:10, at a temperature in the range of 1,000° C. to 1,300° C. for a time sufficient to produce said ceramic.
Claim 3
Dependent Claim
23 words
The method according to claim 1, wherein the alkali metal or alkaline earth metal compound is a potassium compound or a magnesium compound.
Claim 4
Dependent Claim
12 words
The method according to claim 1, wherein the mixture further comprises silica.
Claim 5
Dependent Claim
11 words
The method according to claim 3, wherein silica is fused silica.
Claim 6
Dependent Claim
17 words
The method according to claim 3, wherein a content of silica is 60% to 90by wt. %.
Claim 7
Dependent Claim
18 words
The method according to claim 1, wherein the mixture further comprises a compound of a rare earth element.
Claim 8
Dependent Claim
27 words
The method according to claim 6, wherein the compound of the rare earth element an oxide or a compound which is converted to an oxide by firing.
Claim 9
Dependent Claim
18 words
The method according to claim 3, wherein the mixture further comprises a compound of a rare earth element.
Claim 10
Dependent Claim
28 words
The method according to claim 8, wherein the compound of the rare earth element is an oxide or a compound which is converted to an oxide by firing.
Claim 11
Independent Claim
137 words
A method for producing a ceramic article having a honeycomb structure which comprises molding a mixture comprising at least one compound selected from the group consisting of the sulfate, nitrate, carbonate, oxide, hydroxide, acetate and oxalate of an alkali metal or an alkaline earth metal, titanium oxide and rehydratable alumina, wherein the mixing ratio of the alkali metal or alkaline earth metal compound and titanium oxide is such that 0.1 to 4 gram atoms of titanium as titanium oxide are present per gram atom of the alkali or alkaline earth metal in the metal compound, and the weight ratio of titanium oxide to the rehydratable alumina is from 1:1 to 1:10 and then firing said mixture at a temperature in the range of 1000° C. to 1300° C. for a time sufficient to produce said ceramic article.
Claim 12
Independent Claim
137 words
A method for producing a ceramic article having a honeycomb structure which comprises molding a mixture comprising at least one compound selected from the group consisting of the sulfate, nitrate, carbonate, oxide, hydroxide, acetate and oxalate of an alkali metal or an alkaline earth metal, titanium oxide and rehydratable alumina, wherein the mixing ratio of the alkali metal or alkaline earth metal compound and titanium oxide is such that 0.1 to 4 gram atoms of titanium as titanium oxide are present per gram atom of the alkali or alkaline earth metal in the metal compound, and the weight ratio of titanium oxide to the rehydratable alumina is from 1:1 to 1:10 and then firing said mixture at a temperature in the range of 1000° C. to 1300° C. for a time sufficient to produce said ceramic article.
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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) | 1993-02-12 | 1993-08-14 | 1994-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-12 | 1997-08-14 | 1998-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-12 | 2001-08-14 | 2002-02-13 | $7700.00 | Window Closed / Lapsed |