Compositions: ceramic – Ceramic compositions – Refractory
Patent
1987-09-09
1989-11-28
Bell, Mark L.
Compositions: ceramic
Ceramic compositions
Refractory
501106, C04B 3516, C04B 3548
Patent
active
048837814
ABSTRACT:
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.degree. C. being not more than 30.times.10-7/.degree. C. and a melting point being not less than 1,600.degree. C. The composite bodies have a chemical composition essentially consisting of 58.2 to 65.4% by weight of ZrO.sub.2, 17.4 to 37.1% by weight of P.sub.2 O.sub.5, and 1.5 to 19.0% by weight of SiO.sub.2. The heat resisting low expansion zirconyl phosphate-zircon composite bodies optionally contain MgO and Al.sub.2 O.sub.3 in a total amount of not more than 2.5% by weight or 0.1 to 4% by weight of Nb.sub.2 O.sub.5. A process for producing such zirconyl phosphate-zircon composite bodies is also disclosed.
REFERENCES:
patent: 4703023 (1987-10-01), Yamai
"Synthesis and Thermal Expansion of MZR.sub.4 P.sub.6 O.sub.24 (M=Mg, Ca, Sr, Ba)", J. Am. Ceram., Soc., 70[10]C-2322-C-236 (1987).
Ohashi Tsuneaki
Watanabe Keiichiro
Bell Mark L.
NGK Insulators Ltd.
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