Phosphate compounds, sintered bodies thereof and manufacture of

Details Phosphate compounds, sintered bodies thereof and manufacture of Phosphate compounds, sintered bodies thereof and manufacture of

1990-12-14

1992-07-07

Dixon, Jr., William R.

Compositions: ceramic

Ceramic compositions

Refractory

501 94, 501102, 501103, C04B 3548, C04B 3549, C04B 3502

Patent

active

051282887

ABSTRACT:
A heat resistant, low expansion phosphate compound and sintered bodies thereof, having a composition of RZr.sub.4 P.sub.6 O.sub.24 (R is one or more cations of IIa group in the periodic table, such as Ba, Sr and Ca): an average thermal expansion coefficient between room temperature and 1,400.degree. C. of -10.about.+10.times.10.sup.-7 /.degree.C.; and having a high temperature type crystalline structure having R3c symmetry at room temperature. The sintered body of the invention can be manufactured by mixing and shaping starting materials, firing the resulting shaped body at 1,400.degree. C..about.1,700.degree. C. to provide a sintered body with a composition of RZr.sub.4 P.sub.6 O.sub.24 and then, keeping the obtained sintered body at a high temperature of not lower than a temperature of phase transition between a high temperature type and a low temperature type crystalline structure, followed by quenching.

REFERENCES:
patent: 4751206 (1988-06-01), Yamai et al.
patent: 4801566 (1989-01-01), Limaye et al.
patent: 4883781 (1989-11-01), Watanabe et al.
patent: 4888312 (1989-12-01), Watanabe et al.
patent: 4925816 (1990-05-01), Watanabe et al.
patent: 4968648 (1990-11-01), Watanabe et al.
International Tables for X-Ray Crystallography vol. 1, p. 275.
Communications of the American Ceramic Society 70 [10] C-232 C-236 (1987).
Annual Meeting Abstracts, The American Ceramic Society, 91st Annual meeting and Exposition, Annual Meeting Abstracts, Apr. 23-27, 1989, Indianapolis, Indiana, p. 200, Synthesis and Low Thermal Expansion Behavior of NaZr.sub.2 (PO.sub.4).sub.3 -Type Structure Zirconium Phosphates, T. Ohashi et al.

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