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Study on Polycrystalline Alumina Fiber Reinforced Mullite-Zirconia Composites

FU shun-de,WANG xiao-rui,XU jian-feng (Sinosteel Luoyang Institute of Refractories Research Co.,Ltd., State Key Laboratory of Advanced Refractories,Luoyang 471039)  
The Mullite-zirconia composites were prepared using fusion cast mullite,partially stabilized ZrO_2 and a Alumina micronic powder as main starting materials,polycrystalline Alumina fiber (0,5%,10%,15%and20%in volume ratio)as supplements,calcined at 1500℃for 3hr.The heating shrinkage ratio,bending strength,compressive strength and thermal shock resistance were determined. The results show that;suitable amount of polycrystalline Alumina fiber can decrease the heating shrinkage ratio of samples,improve its bending strength and thermal shock resistance.The compressive strength of samples only decrease a little.
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