ZrC基复合材料及微观结构分析  

ZrC based composites by reactive melt infiltration

作　　者：戎志丹[1,2] 刘玉付[1,2] 仲文静[1,2] 

机构地区：[1]东南大学材料科学与工程学院,南京211189 [2]东南大学江苏省土木工程材料重点实验室,南京211189

出　　处：《东南大学学报（自然科学版）》2013年第2期350-354,共5页Journal of Southeast University：Natural Science Edition

摘　　要：为了研发超高温陶瓷材料(耐高温2 000℃以上),采用熔渗法成功制备了ZrC基复合材料.对原材料配合比及固化压力的研究发现:在相同的固化压力下,随树脂含量增加,开孔率下降;在相同的固化压力及相同的树脂含量条件下,随着ZrC含量的增大,密度和开孔率也会随着升高;随着固化压力的增加,促进了气体的逸出,导致了闭孔的减少.根据以上研究,通过对原材料配合比及固化压力合理的优选与优化,获得适合渗锆反应的碳预制件.采用现代分析测试手段对ZrC基复合材料的微观组织和结构进行了系统研究,结果表明,制备的ZrC复合材料主要由连续ZrC、颗粒状ZrC和残余C组成,组织结构均匀,致密度较高,但其内部结构比较复杂,存在Zr-ZrC共晶相.In order to research ceramic with high temperature resistance（2 000 ℃）,ZrC based ceramics was prepared by reactive melt infiltration.The research of raw materials and solidified pressure indicate that porosity decreases with the increase of resin content at the same solidified pressure.The density and the open porosity increases with the increase of ZrC content at the same solidified pressure and resin content.The increase of the solidified pressure can accelerate the escaping of gases and decrease the number of the closed pores,which benefit the infiltration of ZrC melt.The various mass ratios of original materials and the solidified pressure were optimized to obtain a porous carbon/carbon（C/C） skeleton.The microstructural features of the composite were revealed by modern analysis and testing methods.The results show that the composite is composed of continuous ZrC,island-like ZrC particles and residual carbon.The material is homogenous with relatively high density,whereas the microstructure is complex and eutectic phase Zr-ZrC is found.

关 键 词：熔渗法 碳化锆 微观结构 共晶 

分 类 号：TB332[一般工业技术—材料科学与工程]