Method for preventing low-temperature degradation of tetragonal

Details Method for preventing low-temperature degradation of tetragonal Method for preventing low-temperature degradation of tetragonal

1998-02-19

1999-08-03

Marcheschi, Michael

Compositions: ceramic

Ceramic compositions

Refractory

501127, 264 66, 264345, C04B 3510

Patent

active

059325070

ABSTRACT:
A ceramic body having a surface region containing tetragonal zirconia is sintered to at least 95% theoretical density at a temperature below about 1550 .degree. C. The surface region is then heat treated to reverse local stresses therein. Low temperature degradation in tetragonal zirconia, and materials containing tetragonal zirconia, is significantly inhibited. The heat treated ceramic is especially suited for use in structural components such as valves, engine housings, pistons (chambers) and the like which, during operation, are frequently exposed to temperatures ranging from room temperature to 500.degree. C. for prolonged periods of time.

REFERENCES:
patent: 4525464 (1985-06-01), Claussen et al.
patent: 4853353 (1989-08-01), Whalen et al.

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