摘要
研究了碳化硅晶片(SiC_(p1))增韧二硼化锆(ZrB_2)陶瓷的制备及其力学性能。采用热压烧结方法,在烧结温度1 950℃、保温时间1h、压力20MPa、流动氩气气氛下,制备了高致密度的SiC_(p1)/ZrB_2复合材料。通过X射线衍射分析、扫描电子显微镜、三点弯曲法和单边切口梁法对SiC_(p1)/ZrB_2陶瓷复合材料的物相、显微结构和力学性能进行了研究,结果表明:随着SiC_(p1)的加入,SiC_(p1)/ZrB_2复合材料的相对致密度和断裂韧性都得到了较大提高,当SiC_(p1)添加量为15%(体积分数)时,相对致密度达到99%,断裂韧性达到(8.35±0.26)MPa·m^(1/2),抗弯强度达到(522±49)MPa。用轧膜法制备的SiC_(p1)定向排列的SiC_(p1)/ZrB_2复合材料的力学性能略有下降。
Zirconium diboride （ZrB2） based ceramics reinforced by silicon carbide platelet （SiCpl） have been investigated. Using the hot pressing sintering method, high density SiCpl/ZrB2 composites were prepared at a sintering temperature of 1 950℃ for 1 h under 20 MPa pressure in an argon flow. The phase composition, microstructure and mechanical properties of the SiCpl/ZrB2 ceramic composites were researched by X-ray diffraction, scanning electron microscopy, three-point bending test and single-edge notched beam method. The results show that the relative density and toughness of the SiCpl/ZrB2 composites added with the increase of SiCpl are improved greatly. When 15% （in volume） SiCpl are added, the relative density of SiCpl/ZrB2 ceramic composites reach 99%, the toughness reachs （8.35±0.26）MPa·m^1/2, and the bending strength reachs （522±49）MPa. The mechanical properties of SiCpl/ZrB2 composites with oriented arrangement of SiCpl in the composites prepared by the rolled film method slightly descend.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2008年第A01期85-88,共4页
Journal of The Chinese Ceramic Society
基金
国家“973”计划(5133102-4)资助项目。
关键词
二硼化锆
碳化硅晶片
超高温陶瓷
性能
zirconium diboride
silicon carbide platelet
ultra-high temperature ceramics
property
