原位合成ZrB_(2)对SiC-ZrB_(2)陶瓷复合材料组织与性能的影响  

Effect of In-situ Synthesized ZrB_(2) Content on Microstructure and Properties of SiC-ZrB_(2) Composites

作　　者：黄楠 韩凌锋 张翠萍 岳新艳 茹红强 王伟 HUANG Nan;HAN Lingfeng;ZHANG Cuiping;YUE Xinyan;RU Hongqiang;WANG Wei(School of Materials Science and Engineering,Northeastern University,Shenyang 110819,China;Key Laboratory for Anisotropy and Texture of Materials Ministry of Education,Shenyang 110819,China)

机构地区：[1]东北大学材料科学与工程学院材料各向异性与织构教育部重点实验室,沈阳110819

出　　处：《硅酸盐学报》2021年第12期2589-2594,共6页Journal of The Chinese Ceramic Society

基　　金：辽宁省自然基金资助计划(2019-MS-126);国家重点研发计划(2017YFB0310300);国家自然科学基金(51602041,51772048);装备预先研究项目(41422010905,41422010903)。

摘　　要：以碳化硅(SiC)、二氧化锆(ZrO_(2))、碳化硼(B_(4)C)、水溶性酚醛树脂以及炭黑为原料,基于原位反应合成法在SiC基体中合成不同体积含量[30%(体积分数)、35%、40%、45%]的ZrB_(2),并采用无压烧结法制备得到SiC-ZrB_(2)陶瓷复合材料,研究了ZrB_(2)含量对SiC-ZrB_(2)复合材料物相组成、显微组织、力学性能以及电学性能的影响。结果表明:不同ZrB_(2)含量的复合材料中,其相组成均为SiC和ZrB_(2),并存在少量的B_(13)C_(2);随着ZrB_(2)含量的增加,复合材料中ZrB_(2)晶粒尺寸增大、ZrB_(2)颗粒间呈相互连接趋势,并且复合材料致密度、力学性能与导电性能均呈增加趋势。当ZrB_(2)含量为45%时,复合材料的体积密度、开口气孔率、相对密度、抗折强度、Vickers硬度和电阻率分别为4.16 g/cm^(3)、0.27%、95%、(332±17) MPa、(16±2) GPa和(2.35±0.7×10^(-6))Ω·m。ZrB_(2) with different volume contents(30%,35%,40% and 45%) was in-situ synthesized in SiC matrix with silicon carbide(SiC),zirconium dioxide(ZrO_(2)),boron carbide(B_(4)C),water-soluble phenolic resin and carbon black as raw materials.SiC-ZrB_(2) composites were prepared via pressureless sintering.The effect of ZrB_(2) content on the microstructure and properties was investigated by X-ray diffraction,scanning electron microscopy,and electronic universal tests.The results show that the phase composition of the composites with different ZrB_(2) contents are SiC and ZrB_(2) with a little of B_(13)C_(2).The grain size of ZrB_(2) increases,the particles interconnect,the density,mechanical properties and electrical conductivity of the composites increase when ZrB_(2) content increases.At ZrB_(2) content of 45%,the volume density,open porosity,relative density,flexural strength,vickers hardness and volume resistivity of the composites are 4.16 g/cm^(3),0.27%,95%,(332±17) MPa,(16±2) GPa and(2.35±0.7×10^(-6)) Ω·m,respectively.

关 键 词：碳化硅-硼化锆陶瓷复合材料 原位合成 无压烧结 显微组织 

分 类 号：TQ174[化学工程—陶瓷工业]