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《Materials for Mechanical Engineering》 2018-04
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Effects of Carbon Fiber Addition Amount on Thermal Shock Resistance and Sintering Performance of MgO-ZrO_2 Ceramics

YANG Mengmeng;LUO Xudong;AN Di;XIE Zhipeng;FENG Dong;YU Min;School of High Temperature Materials and Magnesium Resource Engineering,University of Science and Technology Liaoning;State Key Lab of New Ceramics and Fine Processing,School of Materials Science and Engineering,Tsinghua University;  
Carbon fiber enhanced MgO-ZrO_2 ceramics were prepared by pressureless sintering with magnesia nano-powder and ZrO_2 fiber as raw materials and chopped carbon fiber as additive.The effects of carbon fiber addition amount on sintering performance,phase composition,thermal shock resistance and microstructure of the ceramics were investigated.The results show that with increasing carbon fiber addition amount,the relative density and linear shrinkage rate of the ceramics decreased while the apparent porosity increased,indicating that the addition of carbon fiber was bad for the sintering of MgO-ZrO_2 ceramics.The flexural strength first increased and then decreased with increasing carbon fiber addition amount and reached the largest value of 287.15 MPa with 20 vol%carbon fiber.The addition of carbon fiber increased the thermal shock resistance of the MgO-ZrO_2 ceramics.When the volume fraction of carbon fiber was 15%,the thermal shock resistance of the ceramics was the best.
【Fund】: 国家自然科学基金资助项目(51402143;51504133)
【CateGory Index】: TQ174.1
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