Claims
- 1. A method for protecting an article from attack by water having a temperature of at least 100.degree. C. comprising the steps of:
- (a) depositing on the surface of particles of zirconia a coating of an oxide selected from the group consisting of hydrous oxides of yttrium and oxides of yttrium;
- (b) shaping the coated particulate zirconia into a ceramic green body,
- (c) firing said ceramic green body to form a shaped, fired ceramic article having at least one surface formed from said coated particulate zirconia; and
- (d) contacting said surface of said article with water having a temperature of at least 100.degree. C.
- 2. A method according to claim 1, wherein the particulate zirconium has a particle size such that the majority of the particles thereof have a diameter of not more than 0.5 micron.
- 3. A method according to claim 1 in which the particles of zirconia have a coating of hydrous oxide of yttrium in an amount of from 0.5 to 10 mole percent expressed as Y.sub.2 O.sub.3 on moles of zirconia.
- 4. A method according to claim 1 in which the particles of zirconia are also coated with an oxide or hydrous oxide of zirconium, titanium or aluminum.
- 5. A method according to claim 4 in which the amount of the hydrous oxide of zirconium, titanium or aluminum is from 0.2 to 5 mole percent expressed as the respective oxide on moles of zirconia.
- 6. A method according to claim 1 in which said ceramic material forms a surface of an internal combustion engine.
- 7. A method according to claim 6 in which said surface is a surface of a valve, a valve guide, a valve seat, a cylinder liner, a piston crown or of an exhaust part.
- 8. A method according to claim 1 in which an exposed portion of said article comprises a surface of a sparking plug.
- 9. A method according to claim 1 in which an exposed portion of said article comprises a surface of an impeller for a turbo-charger.
- 10. A method according to claim 1 in which an exposed portion of said article comprises a surface of an impact plate for a mill.
- 11. A method according to claim 1 in which an exposed portion of said article comprises a surface of a pump.
- 12. A method according to claim 1 in which an exposed portion of said article comprises a surface of a fuel cell.
- 13. A method according to claim 1 in which an exposed portion of said article comprises a surface of a permeable ceramic plate.
Priority Claims (1)
Number |
Date |
Country |
Kind |
8913819 |
Jun 1989 |
GBX |
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Parent Case Info
This application is a division of application Ser. No. 07/530,614, filed May 30, 1990, now abandoned.
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Divisions (1)
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Number |
Date |
Country |
Parent |
530614 |
May 1990 |
|