2006•Journal of Zhejiang University(Engineering Science)Requires access
Effects of micro-powder and firing temperature on microstructure and properties of corundum-mullite materials
Hui Ying Yang
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Abstract
The effects of microsilica,alumina and sintering temperature on the microstructure and properties of corundum-mullite duplex ceramics were investigated by orthogonal experiment.The effect of alumina mass fraction was the greatest on high modulus of rupture(HMOR) of the ceramics,the effects of firing temperature was the greatest on thermal shock resistance and creep properties,and the effect of microsilica on high-temperature properties was the least.Proper design of microsilica,alumina powder and firing temperature can control the combination of particles with matrix and that of mullite,porosity and the remaining α-Al_2O_3,and adjust thermal expansion coefficient,elastic modulus and thermal conductivity to improve thermal shock resistance and creep properties of corundum-mullite duplex ceramics.The rupture of corundum-mullite materials was controlled by crack at room temperature and creep at high temperature.