Zirconyl phosphate sintered bodies and production thereof

Details Zirconyl phosphate sintered bodies and production thereof Zirconyl phosphate sintered bodies and production thereof

1988-05-26

1989-12-19

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Refractory

C04B 3548

Patent

active

048883123

ABSTRACT:
Zirconyl phosphate sintered bodies are disclosed, which each have a molar ratio of ZrO.sub.2 /P.sub.2 O.sub.5 being not less than 1.8 but less than 2.0 and contain .beta.-(ZrO).sub.2 P.sub.2 O.sub.7 as a main crystalline phase. The zirconyl phosphate sintered bodies have a coefficient of thermal expansion and a thermal expansion hysteresis in a temperature range from room temperature to 1,4000.degree. C. being not more than 20.times.10.sup.-7 /.degree.C. and 0.05 to 0.30%, respectively. A process for producing zirconyl phosphate sintered bodies is also disclosed, which comprises preparing a starting material powder of zirconyl phosphate, shaping the starting material powder, and firing the shaped bodies. The zirconyl phosphate sintered body has a molar ratio of ZrO.sub.2 /P.sub.2 O.sub.5 being not less than 1.8 but less than 2.0 and the average particle diameter of 0.5 to 20 .mu.m, and contains oxides of an alkali metal and an alkaline earth metal in a total amount of not more than 0.5% by weight.

REFERENCES:
patent: 4703023 (1987-10-01), Yamai
Yamai and Oota, J. Am. Ceram. Soc. 70 (8), 585-590 (1987).
Yougyou Gijyutsu Research Institute Annual Report, No. 7, pp. 7-13 (1980) of Nagoya Industrial University.
Yamai and Oota, J. Am. Ceram. Soc. 68, pp. 273-278 (1985).

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