Claims
- 1. A solid ceramic body manufactured from a plurality of zirconia particles which have been shaped and fired to form said ceramic body, a majority of the particles before shaping and firing having a diameter of less than or equal to 0.5 micron and having a coating comprised of a hydrous oxide of zirconium and a hydrous oxide of yttrium, calcium, magnesium, strontium or cerium.
- 2. A solid ceramic body according to claim 1 in which the hydrous oxide of zirconium is mixed with the said other hydrous oxide.
- 3. A solid ceramic body according to claim 1 in which the hydrous oxide of zirconium is present as a discrete inner layer surrounded by a coating of said other hydrous oxide.
- 4. A solid ceramic body according to claim 1 in which the majority of the said particles of zirconia have a size less than 0.2 microns.
- 5. A solid ceramic body according to claim 1 in which the amount of the hydrous oxide of yttrium is from 0.5 to 7 mole percent expressed as Y.sub.2 O.sub.3 on mols of zirconia.
- 6. A solid ceramic body according to claim 1 in which the amount of the hydrous oxide of yttrium is from 2 to 5 mole % Y.sub.2 O.sub.3 on moles of zirconia.
- 7. A solid ceramic body according to claim 1 in which the amount of the hydrous oxide of calcium, magnesium, strontium or cerium is from 2 to 10 mole % expressed as oxide on moles of zirconia.
- 8. A solid ceramic body according to claim 7 in which the amount of said hydrous oxide is from 4 to 8 mole % as oxide on moles of zirconia.
- 9. A solid ceramic body according to claim 1 in which the amount of said hydrous oxide of yttrium is from 5 to 10 mole % as oxide on moles of zirconia.
- 10. A solid ceramic body according to claim 9 in which the amount of said hydrous oxide is from 6 to 9 mole % as oxide on moles of zirconia.
- 11. A solid ceramic body according to claim 1 in which the amount of said hydrous oxide of calcium, magnesium, strontium or cerium is from 8 to 20 mole % as oxide on moles of zirconia.
- 12. A solid ceramic body according to claim 11 in which the said amount is from 9 to 17 mole % as oxide on moles of zirconia.
- 13. A composition according to claim 1 in which the hydrous oxide of zirconium is present in an amount of from 0.2 to 5 mole % as ZrO.sub.2 on moles of zirconia.
- 14. A composition according to claim 13 in which said amount of the hydrous oxide of zirconium is from 0.5 to 2 mole % as ZrO.sub.2 on moles of zirconia.
- 15. A solid ceramic body manufactured from a plurality of zirconia particles which have been shaped and fired to form said ceramic body, a majority of the particles before shaping and firing having a diameter of less than or equal to 0.5 microns and having a coating comprising a hydrous oxide of zirconium and a hydrous oxide of yttrium, calcium, magnesium, strontium or cerium.
Priority Claims (1)
Number |
Date |
Country |
Kind |
8524140 |
Oct 1985 |
GBX |
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Parent Case Info
This application is a continuation of application Ser. No. 905,139, filed Sept. 9, 1986 now abandoned.
US Referenced Citations (3)
Foreign Referenced Citations (4)
Number |
Date |
Country |
0140638 |
Oct 1985 |
EPX |
1392189 |
Apr 1975 |
GBX |
1395700 |
May 1975 |
GBX |
1417574 |
Dec 1975 |
GBX |
Non-Patent Literature Citations (3)
Entry |
English Abstract of Japanese Patent No. 57191234, 11-25-82. |
English Abstract of Japanese Patent No. 58176127, 10-15-83. |
Toyo Soda Manufacturing Co., TSK Ceramics Technical Bulletin. |
Continuations (1)
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Number |
Date |
Country |
Parent |
905139 |
Sep 1986 |
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