烧结温度对反应热压烧结制备ZrB_2-ZrC-W_2Zr复合材料组织和力学性能的影响  

Effect of Sintering Temperature on Microstructure and Mechanical Properties of ZrB_2-ZrC-W_2Zr Composites Prepared by Reactive Hot-pressing Method

作　　者：董善亮[1] 霍思嘉 甄淑颖 张宇民[1] 王玉金[2] DONG Shanliang;HUO Sijia;ZHEN Shuying;ZHANG Yumin;WANG Yujin(Center for Composite Materials and Structure,Harbin Institute of Technology,Harbin 150080;Institute for Advanced Ceramics,School of Materials Science and Engineering,Harbin Institute of Technology,Harbin 150080)

机构地区：[1]哈尔滨工业大学复合材料与结构研究所,哈尔滨150080 [2]哈尔滨工业大学材料科学与工程学院特种陶瓷研究所,哈尔滨150080

出　　处：《材料导报》2018年第12期1994-1997,共4页Materials Reports

基　　金：国家自然科学基金(51472060;51532006)

摘　　要：以B_4C、Zr、W为原料,采用反应热压烧结工艺制备了ZrB_2-ZrC-W_2Zr复合材料,系统研究了烧结温度对复合材料组织结构和力学性能的影响规律。结果表明,复合材料主要由ZrB_2、ZrC、W_2Zr和少量的W组成,随着烧结温度从1 600℃升高到1 900℃,W的含量略有增加,W_2Zr的含量略有减少,ZrB_2晶粒的形态由针状向板条状转变,晶粒尺寸逐渐增大,而长径比逐渐减小。复合材料的抗弯强度和断裂韧性随着烧结温度的升高先增大后减小,在1 850℃出现峰值,分别达到约560 MPa和5.5 MPa·m^(1/2)。ZrB2-ZrC-W2Zr composites were fabricated by reactive hot-pressing method via chemical reaction of B_4C,Zr and W powders.The effect of sintering temperature on the microstructure and mechanical properties of the composites was investigated.As a result,the composites were composed of ZrB2,ZrC,W2Zr and a spot of W phase.With the sintering temperature increased from 1 600 ℃to 1 900 ℃,the content of W increased slightly while W2Zr slightly reduced,the morphology of ZrB2 led to a change of needle-like to lath-like,the average size of grains increased while the aspect ratio decreased.The flexural strength and fracture toughness firstly increased and then decreased depending on the sintering temperature.The maximum values of 560 MPa and 5.5 MPa·m^（1/2） were reached at 1 850 ℃.

关 键 词：ZrB2-ZrC-W2Zr复合材料 反应热压烧结 烧结温度 组织结构 力学性能 

分 类 号：TQ174.5[化学工程—陶瓷工业]