| 摘要 |
<p>Heat resisting low expansion zirconyl phosphate-zircon composite bodies are disclosed, which contain zirconyl phosphate and zircon as a main crystalline phase and a secondary crystalline phase, respectively. The heat resisting low expansion zirconyl phosphate-zircon composite bodies have a coefficient of thermal expansion in a temperature range from room temperature to 1,400 DEG C being not more than 30x10<-><7>/ DEG C and a melting point being not less than 1,600 DEG C. The composite bodies have a chemical composition essentially consisting of 58.2 to 65.4% by weight of ZrO2, 17.4 to 37.1% by weight of P2O5, and 1.5 to 19.0% by weight of SiO2. The heat resisting low expansion zirconyl phosphate-zircon composite bodies optionally contain MgO and A l 2O3 in a total amount of not more than 2.5% by weight or 0.1 to 4% by weight of Nb2O5. A process for producing such zirconyl phosphate-zircon composite bodies is also disclosed.</p> |
