| 摘要 |
PURPOSE:To improve strength, low expansion properties, high-temperature stability, etc., by blending oxides of Zr, P and Si with a salt of a specific element, calcining the resultant blend and providing a specified solid solution phase. CONSTITUTION:Substances selected from ZrP2O7, (ZrO2)2P2O7, ZrO2, ZrSiO4, SiO2 and phosphates and silicates of R and RO (R is element capable of providing di- to trivalent ions) are used as raw materials. The above-mentioned raw materials are blended at a ratio so as to provide RyZr4SixO6-XO24 (R is one or more elements capable of providing di- to trivalent ions; x is a number of <=0 to <=2; y is a number of >=2/3 to <=2 satisfying electrical neutral conditions expressed by the formula) to afford a batch mixture, which is then formed into a compact. The resultant compact is subsequently calcined at about 1400-1800 deg.C for about 2-10hr to afford the subject heat-resistant calcined compact having the crystal phase consisting essentially of a solid solution phase expressed by the above-mentioned formula. The weight loss of the calcined compact is about <=10% by heat treatment at 1400 deg.C for 100hr. |
