Heat resistive phosphate-zircon composite bodies and process for

Details Heat resistive phosphate-zircon composite bodies and process for Heat resistive phosphate-zircon composite bodies and process for

1992-01-27

1993-06-08

Bell, Mark L.

Compositions: ceramic

Ceramic compositions

Refractory

501102, 501103, 501104, C04B 3548

Patent

active

052179346

ABSTRACT:
A heat resistive phosphate-zircon composite body including a main crystalline phase and a secondary crystalline phase, the main crystalline phase being a solid-solved phase of R.sub.y Zr.sub.4 Si.sub.x P.sub.6-x O.sub.24 in which 0<x<2, 2/3<y<2, and R includes of one or more kinds of bivalent or trivalent cations (provided that x and y satisfy electrical neutrality), and the secondary crystalline phase being zircon. A process for producing a heat resistive phosphate-zircon composite body is also disclosed. The process includes the steps of measuring and mixing given amounts of ZrP.sub.2 O.sub.7, (ZrO).sub.2 P.sub.2 O.sub.7, RO and/or a phosphate of R, SiO.sub.2 and a zircon powder, shaping the mixture and firing the shaped body, wherein the given amounts of ZrP.sub.2 O.sub.7, (ZrO).sub.2 P.sub.2 O.sub.7, RO and/or the phosphate of R, and SiO.sub.2 are measured such that the composite body may include a main crystalline phase composed of a solid-solved phase of R.sub.y Zr.sub.4 Si.sub.x P.sub.6-x O.sub.24 and a secondary crystalline phase of zircon.

REFERENCES:
patent: 4925816 (1990-05-01), Watanabe et al.
Abstract (English): JP 63-40757. Nippon Ceramics Aug. 1, 1986.
Chemical Abstracts, vol. 108, No. 26, Jun. 1988, Columbus US, p. 259, abstract No. 225857h.
Journal of the American Ceramic Society, vol. 69, No. 1, Jan. 1986, Columbus US, pp. 1-6; T. Oota et al. "Thermal Expansion Behavior of NaZr.sub.2 (PO4)3-Type Compounds".

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