Method for producing ceramics with thermal shock resistance

• US 4,900,703 A
• Filed: 11/02/1988
• Issued: 02/13/1990
• Est. Priority Date: 01/28/1986
• Status: Expired due to Term

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Nishino, Atsushi, Takeuchi, Yasuhiro, Numoto, Hironao, Ono, Yukiyoshi
• Primary Examiner(s): Hearn, Brian E.
• Assistant Examiner(s): Griffis, Andrew
• Application Number:
  US07/267,614
• Time in Patent Office: 468 Days
• Field of Search: 501/136, 501/137, 501/153, 428/116, 264/56
• US Class Current: 501/136
• CPC Class Codes: B01J 23/02 of the alkali- or alkaline earth metals or beryllium
• CPC Class Codes: C04B 35/14 based on silica
• CPC Class Codes: C04B 35/18 rich in aluminium oxide
• CPC Class Codes: C04B 35/195 Alkaline earth aluminosilicates, e.g. cordierite or anorthite
• CPC Class Codes: C04B 35/478 based on aluminium titanates
• CPC Class Codes: Y10T 428/24149 Honeycomb-like

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° C. to 1,300° C.

Claims

1. 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.

2. The method according to claim 1, wherein the alkali metal or alkaline earth metal compound is a potassium compound or a magnesium compound.

3. The method according to claim 1, wherein the mixture further comprises silica.

4. The method according to claim 3, wherein silica is fused silica.

5. The method according to claim 3, wherein a content of silica is 60% to 90by wt. %.

6. The method according to claim 1, wherein the mixture further comprises a compound of a rare earth element.

7. 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.

8. The method according to claim 3, wherein the mixture further comprises a compound of a rare earth element.

9. 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.

10. 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.