Claims
- 1. A method of manufacturing a solid ceramic body which comprises
- a. mixing an aqueous dispersion of zirconia particles, said particles having a diameter of less than or equal to 0.5 microns with
- (i) a water-soluble hydrolyzable salt of zirconium in an amount of from 0.2 to 5 mole % calculated as ZrO.sub.2 based on moles of zirconia particles and
- (ii) a water-soluble hydrolyzable salt selected from the group consisting of water-soluble salts of yttrium in an amount of from 0.5 to 7 mole % calculated as Y.sub.2 O.sub.3 based on moles of zirconia particles and water-soluble salts of calcium, magnesium, strontium and cerium in an amount of from 2 to 10 mole % expressed as oxide based on moles of zirconia particles;
- b. precipitating a hydrous oxide of zirconium and a hydrous oxide of yttrium, calcium, magnesium, strontium or cerium onto the zirconia particles; and
- c. forming the coated zirconia particles into a shaped body and firing said body of particles to form a solid ceramic body.
- 2. The method according to claim 1, wherein the amount of said water-soluble salt of yttrium is from 2 to 5 mole % calculated as Y.sub.2 O.sub.3 based on moles of zirconia particles.
- 3. The method according to claim 1, wherein the amount of said water-soluble salts of calcium, magnesium, strontium, and cerium is from 4 to 8 mole % calculated as oxide based on moles of zirconia particles.
- 4. The method according to claim 1, wherein said zirconia particles contain less than 0.03% by weight of silica.
- 5. The method according to claim 1 in which the aqueous dispersion of zirconia particles is prepared by mixing the product of the oxidation of zirconium tetrachloride with water.
- 6. A method of manufacturing a solid ceramic body which comprises
- a. mixing an aqueous dispersion of zirconia particles, said particles having an diameter of less than or equal to 0.5 microns with
- (i) a water-soluble hydrolyzable salt of zirconium in an amount of from 0.2 to 5 mole % calculated as ZrO.sub.2 based on moles of zirconia particles and
- (ii) a water-soluble hydrolyzable salt selected from the group consisting of water-soluble salts of yttrium in an amount of from 5 to 10 mole % calculated as Y.sub.2 O.sub.3 based on moles of zirconia particles and water-soluble salts of calcium, magnesium, strontium, and cerium in an amount of from 8 to 20 mole % expressed as oxide based on moles of zirconia particles;
- b. precipitating a hydrous oxide of zirconium and a hydrous oxide of yttrium, calcium, mangesium, strontium, or cerium on to the zirconia particles; and
- c. forming the coated zirconia particles into a shaped body and firing said body of particles to form a solid ceramic body.
- 7. The method according to claim 6, wherein the amount of said water-soluble salt of yttrium is from 6 to 9 mole % calculated as Y.sub.2 O.sub.3 based on moles of zirconia particles.
- 8. The method according to claim 6, wherein the amount of said water-soluble salts of calcium, magnesium, strontium, and cerium is water-soluble salts of calcium, magnesium, strontium, and cerium is from 9 to 17 mole % calculated as oxide based on moles of zirconia particles.
- 9. The method according to claim 6, wherein said zirconia particles contain less than 0.03% by weight of silica.
- 10. The method according to claim 6, wherein the aqueous dispersion of zirconia particles is prepared by mixing the product of the oxidation of zirconium tetrachloride with water.
Priority Claims (1)
Number |
Date |
Country |
Kind |
8524140 |
Oct 1985 |
GBX |
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Parent Case Info
This application is a division of application Ser. No. 07/136,435, filed Dec. 17, 1987, now U.S. Pat. No. 4,820,593, which is a continuation of application Ser. No. 06,905,139, filed on Sept. 9, 1986, now abandoned.
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Divisions (1)
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Number |
Date |
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Parent |
136435 |
Dec 1987 |
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Continuations (1)
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Number |
Date |
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Parent |
905139 |
Sep 1986 |
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