SPS快速反应烧结制备ZrB_2-SiC复合材料及其过程研究  

Rapid Fabrication and Reaction Process of ZrB_2-SiC Composites by Spark Plasma Sintering Process

作　　者：赵媛[1] 王连军[1] 张国军[1] 陈立东[1] 江莞[1] 

机构地区：[1]中国科学院上海硅酸盐研究所高性能陶瓷与超微结构国家重点实验室

出　　处：《稀有金属材料与工程》2007年第A01期819-822,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(50372078);国家杰出青年基金(50625414)

摘　　要：以Zr,B4C,Si粉为起始原料,利用放电等离子烧结(SPS)技术,在1450℃,30MPa,保温3min的条件下快速反应烧结制备得到相对致密度约为98.5%的ZrB2-SiC复合材料。制备得到的复合材料硬度约为17.2GPa,断裂韧性约为4.3MPa·m1/2。通过对SPS过程中不同阶段试样的分析,探讨了复合材料的形成过程。结果表明:当温度达到950℃时,通过X射线衍射(XRD)观察到中间相ZrxSiy的出现,此时主相为ZrB2;随着SPS过程的进行,反应不断发生,当温度约为1250℃时,反应基本结束。Using the mixture of Zr, Si and B4C powder as starting materials, the ZrB2-SiC composites were synthesized under 30 MPa at 1450℃ for 3min by spark plasma sintering technique （SPS）. Dense ZrB2-SiC composites with the relative density 98.5% were successfully fabricated. The Vickers hardness （HV10） of the composites was 17.2GPa, and the fracture toughness was 4.3 MPa.m^1/2. The reaction process of the composites was also investigated by analyzing the samples at different moments. The results show that when sintering temperature reaches 950℃, intermediate phase ZrxSiy can be observed by XRD, meanwhile the main phase is ZrB2. The amount of Zr/Siy decreased with increasing of sintering temperature until 1250℃, at which temperature Zr/Siy could not be observed by XRD.

关 键 词：SPS 原位反应 ZRB2-SIC 反应过程 

分 类 号：TF124.5[冶金工程—粉末冶金]