ニュージーランドカオリンから生成した針状ムライトの高温特性

概要

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Needle-like mullite was prepared by leaching out the silica glass from New Zealand kaolin fired at 1550° to 1700℃. High-temperature properties of the needle-like mullite, such as thermal expansion and thermal shock were examined. Needle-like mullite 1-6μm long, 0.1-0.5 μm thick was obtained at 1550° and 1600℃, and 10-20 μm long, 1-2μm thick, at 1650°and 1700℃. The specific surface area of these crystals grown at 1550° and 1650℃ were 8.2 and 4.1 m^2/g respectively, and did not decrease with reheating in the temperature range from 1000° to 1650℃ for 20-30h. The axial thermal expansion coefficients of crystals at 25°-800℃ were a_a=2.2 a_b=3.9 and a_c=4.5X10^<-6>/℃ No evidences of fracture , and crack were detected on quenching needle-like mullite crystals from 1150℃ to O℃.
社団法人日本セラミックス協会の論文
1989-12-01