Heat resistive phosphate sintered bodies and a process for producing the same

Abstract

Abstract A heat resistive phosphate sintered body including a solid solution of R y Zr 4 Si x P 6-x O 24 in which O≦x≦2, 2/3≦y≦2, R is a combination of one or more of cations having 2-3 valences, and x and y meet an electrically neutral condition, wherein a thermal expansion hysteresis loss is not more than 0.3%, and a dimensional change after a heat cycling in which heating and cooling are repeated between 100° C. and 1,200° C. at 100 times is not more than 1%. A process for producing such a heat resistive phosphate is also disclosed. The process includes the steps of preparing a batch mixture, as a starting material, of (ZrO) 2 P 2 O 7 , ZrP 2 O 7 , RO and/or a phosphate of R in which R is a combination of one or more of cations having two or three valences, and if necessary further SiO 2 , calcining, milling and shaping the thus prepared mixture, and firing the thus shaped body, wherein a calcining temperature is not less than 1,400° C. and equal to or higher than a firing temperature, the starting material is a powder milled to an average particle diameter of not more than 7 μm, and the firing temperature is not less than 1,300° C.

Inventors

• 👤 Keiji Matsuhiro
• 👤 Tsuneaki Ohashi

Bibliographic Details