MoSi_2-SiC复合材料的制备及抗热震性能研究  

Preparation and thermal shock resistance of MoSi_2-SiC materials

作　　者：刘云 常赪[1] 万龙刚[1] 黄志刚[1] 李杰[1] 王文武[1] Liu Yun;Chang Zhen;Wan Longgang;Huang Zhigang;Li Jie;Wang Wenwu

机构地区：[1]中钢集团洛阳耐火材料研究院有限公司先进耐火材料国家重点实验室,河南洛阳471039

出　　处：《耐火材料》2018年第5期362-364,共3页Refractories

基　　金：河南省科技创新人才计划(144100510002)

摘　　要：为了提高重结晶SiC材料的性能,先以高纯SiC为原料,水溶性树脂为结合剂,经混练、成型、烘干、烧成(真空,2 400℃保温2 h)后得到重结晶Si C试样;再用物质的量比为2 1的混合均匀的Si粉和Mo粉将放置于石墨坩埚内的重结晶Si C试样掩埋,在真空、2 000℃保温5 h制备出致密MoSi_2-SiC复合材料,研究了溶渗法制备的MoSi_2-SiC复合材料的性能。结果表明:Mo Si_2-SiC复合材料中主相为Si C,还含有10%(w)的Mo Si_2和3%(w)的Mo_5Si_3相,材料的致密度显著提高,抗热震性能显著优于Si_3N_4结合Si C和重结晶Si C材料的。In order to improve the properties of recrystallized silicon carbide, recrystallized SiC specimens were obtained using high purity SiC as the raw material and water-soluble resin as the binder, mixing, molding,drying,and sintering （in vacuum,holding at 2 400 ℃ for 2 h）. The recrystallized SiC specimens were placed in a graphite crucible, buried by the mixture of Si powder and Mo powder （ molar ratio = 2 ： 1 ）, and then fired at 2 000 ℃ for 5 h in vacuum to obtain the dense MoSi2-SiC composite specimens. The properties of MoSi2-SiC composites prepared by the infiltration method were studied. The results show that the MoSi2-SiC composites have the main phases of SIC,10 mass% MoSi2 and 3 mass% MosSi3 phase,significantly improved the density,and better thermal shock resistance than Si3N4 combined SiC materials and recrystallized SiC materials.

关 键 词：MOSI2-SIC复合材料 重结晶SiC材料 溶渗法 致密性 抗热震性 

分 类 号：TQ175[化学工程—硅酸盐工业]