Aiming at improving the low strength of cordierite insulation materials used in high-temperature in-dustry,cordierite insulation materials were prepared using kyanite,clay,magnesia powder as raw materi-als,starch as the pore forming agent and curing agent,adding a suitable amount of aluminum silicate ce-ramic fiber and MoO3.The prepared materials have a mullite whisker-ceramic fiber multi and interlocked structure by the in-situ formation of mullite whiskers on the surface of aluminum silicate fiber catalyzed by MoO3.The effects of aluminum silicate ceramic fiber under the action of MoO3 heat treated at different tem-peratures(1 200,1 250,1 300 and 1 350 ℃)on the microstructure,cold mechanical properties and thermal conductivity of the materials were studied.The results show that:under the action of MoO3,mullite whiskers grow on the surface of aluminum silicate fiber,showing a vertical trend basically,and partially inserting in well-developed cordierite grains;with the heat treatment temperature increasing,the mullite whiskers on the surface of aluminum silicate ceramic fiber changes from short rods to slender needles,and the length to di-ameter ratio increases gradually;the cordierite material with the fiber-whisker multi and interlocked struc-ture has improved mechanical properties while reduced thermal conductivity;the specimen heat treated at 1 350 ℃ has the optimal performance.
万方数据
维普
