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《Materials for Mechanical Engineering》 2013-01
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Effect of Pore Former on Fabrication Process and Bending Srength of Porous Silicon Carbide Ceramics

LI Hong-wei1,WANG Wei2,GUO Ya-jie1,GENG Gang-qiang1,JIN Hai-yun3(1.School of Material Science and Engineering;2.School of Environment Science and Engineering, Chang′an University,Xi′an 710061,China;3.School of Electrical Engineering,Xi′an Jiaotong University,Xi′an 710049,China)  
Effects of graphite and starch pore former on fabrication process and bending strength of porous silicon carbide(SiC) ceramics were studied.The results show that because graphite contained carbon,silica and so on,carbon was oxidized and exhausted during sintering at high temperature,and continuous pores were left among sic particles;moreover,the silica added the sintering aids so that sintering temperature decreased.However,starch was oxidized all during sintering and sintering temperature was higher.Porous SiC ceramics with porosity of 43.8% and bending strength of 19.6 MPa was prepared with 70wt%SiC,20wt% graphite and 10wt% sintering aids at 1 270 ℃ for 2 h in atmosphere.
【Fund】: 中央高校基金资助项目(CHD2011JC001)
【CateGory Index】: TQ174.1
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