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《Journal of Synthetic Crystals》 2015-01
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Effect of BN on Property of Magnesium-based Carbon-containing Refractories

YU Long;LUO Xu-dong;ZHANG Guo-dong;XIE Zhi-peng;JIN Hui-gang;LIU Fei-fan;School of High Temperature Materials and Magnesium Resource Engineering,Liaoning University of Science and Technology;State Key Lab of New Ceramics and Fine Processing,School of Materials Science and Engineering,Tsinghua University;  
Magnesium-based Carbon-containing refractory was prepared from fused magnesia powder,using magnesia-carbon brick powder,a-Al2O3 micro powder and graphite as raw materials,phenolic resin as bonding,through the process of mixing,forming and heat treatment. The effects of BN addition(0,0. 5%,1. 0%,1. 5%,2. 0% and 2. 5%) and sintering temperature(1250 ℃,1375 ℃ and 1500 ℃)on bulk density,apparent porosity,cold crushing strength,linear change rate after burning,oxidation resistance,microstructure and mineral composition were studied. The results indicate that the sintering property of Magnesium-based Carbon-containing refractory can be promoted by adding BN and increasing sintering temperature. At the high temperature, BN preferentially reacts with the oxygen in the environment to B2O3. Next,B2O3 reacts with Mg O from fused magnesia and used Magnesia-Carbon brick to Mg3B2O6 with low melting point in the matrix. The sintering property and oxidation resistance of Magnesium-based Carbon-containing refractory are enhanced by the liquid Mg3B2O6 generation. The mineral composition includes periclase as main phase and spinel as second phase.
【Fund】: 国家自然科学基金(51402143);; 辽宁省大学生创新创业训练计划项目(201310146033)
【CateGory Index】: TQ175.1
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