Process for the production of low-thermal-expansive (ZrO).sub.2

Details Process for the production of low-thermal-expansive (ZrO).sub.2 Process for the production of low-thermal-expansive (ZrO).sub.2

1986-03-24

1987-10-27

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Refractory

501106, C04B 3548

Patent

active

047030232

ABSTRACT:
In the production of low-thermal-expansive zirconyl phosphate ceramic, whose chemical formula is (ZrO).sub.2.P.sub.2 O.sub.7 and whose chemical composition is 2ZrO.sub.2.P.sub.2 O.sub.5 by sintering of the fine-powder compact, three kinds of reaction aids are employed. They are a densifying aid, a grain-growth-suppressing aid and a solid-solution-forming aid. The densifying aid is always employed, the grain-growth-suppressing aid is employed for producing a more thermal-resistant ceramic for high temperature use and the solid-solution-forming aid is employed for producing a more low-thermal-expansive ceramic.

REFERENCES:
patent: 3268349 (1966-08-01), Brixner
patent: 3954525 (1976-05-01), Myles et al.
patent: 4526765 (1985-07-01), Ito et al.
patent: 4587172 (1986-05-01), Roy et al.
Yamai, I. et al., "Low-Thermal-Expansion Polycrystalline Zirconyl Phosphate Ceramic", J. Am. Cer. Soc., 68(5), pp. 273-278.
Ceramic Industry--Jan. 1983--p. 131, "Zirconal Phosphate".

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