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《Materials for Mechanical Engineering》 2018-04
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Effect of SiC Content on Properties of Low Carbon ZrB_2-SiC/MgO-C Composite Refractory

WANG Junkai;CHENG Feng;HAN Lei;LI Saisai;GE Shengtao;SONG Jianbo;ZHANG Haijun;The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology;  
Low carbon ZrB_2-SiC/MgO-C composite refractories were prepared after formation,drying,curing and heat treatment at different temperatures(1 373,1 673 K)for 3 h with magnesia,flake graphite and ZrB_2-xSiC composite powders as raw materials,where x was equal to 0,20 wt%,40 wt%,60 wt%,80 wt%,100 wt%,respectively,and then the effects of SiC content on the physical and mechanical properties of the refractory were investigated.The results show that with the increase of SiC content,the bulk density and rupture strength at ambient temperature of the cured composite refractory increased and then decreased and then increased slightly while the compressive strength decreased in volatility.The performance at ambient temperature of the composite refractory with 20 wt% SiC was the best.After heat-treatment at 1 673 K for 3 h,the rupture strength of the composite refractory increased and then decreased with increasing temperature,and the rupture strength at different temperatures all reached the largest values with 20 wt% SiC.The change of SiC content had little influence on the relation between load and displacement at different temperatures.The plastic deformation starting temperatures of the composite refractories were 873-1 073 K and the fracture temperature was 1 673 K.
【Fund】: 国家自然科学基金资助项目(51472184 51472185)
【CateGory Index】: TQ175.1
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