Porous Body of Quartz Bonded by Wollastonite.

Shaped body of quartz bonded by tobermorite was fabricated by adding small amount of CaO and by autoclaving at 180°C for 24h. The specimen was fired at various temperatutes and a porous body of quartz bonded by wollastonite was obtained. In specimens fired <1000°C, the bonds between quartz particles mainly provided by β-wollastonite formed by topotactic reaction of tobermorite. On the other hand, in specimens fired >1130°C, quartz particles were connected by both crystobalite and β-wollastonite, and the bond provieded by the latter being stronger than that of the former.