粗骨料的含量对自结合SiC陶瓷显微结构与力学性能的影响  

Effect of Content of Coarse Aggregates on Microstructure and Mechanical Properties of Self-bonded SiC Materials

作　　者：劳新斌 李亚格 江伟辉 涂治 梁健 徐笑阳 吴倩 虞澎澎 LAO Xinbin;LI Yage;JIANG Weihui;TU Zhi;LIANG Jian;XU Xiaoyang;WU Qian;YU Pengpeng(National Engineering Research Center for Domestic and Building Ceramics,Jingdezhen Ceramic University,Jingdezhen 333000,China;School of Materials Science and Engineering,Wuhan University of Science and Technology,Wuhan 430000)

机构地区：[1]景德镇陶瓷大学国家日用及建筑陶瓷工程技术研究中心,景德镇333000 [2]武汉科技大学材料科学与工程学院,武汉430000

出　　处：《中国陶瓷》2023年第11期34-38,共5页China Ceramics

基　　金：国家自然科学基金项目(52262007、52202063、51962012、51702141);江西省主要学科学术与技术带头人-青年人才项目(20204BCJ23005);江西省自然科学基金项目(20202BAB214007、20202BABL214006);江西省教育厅科技计划项目基金(GJJ211314、GJJ211313)

摘　　要：以α-SiC为骨料、Si粉和石墨为基质,采用埋粉烧结法制备了自结合SiC材料,主要探讨α-SiC中粗颗粒含量对材料的物相组成、显微结构与理化性能的影响。研究结果表明,α-SiC骨料中粗颗粒(过80目筛)比例的增加虽然有利于气孔数量的减少与致密度的增加,但气孔的减少抑制了SiO_(2)的碳热还原反应,减少了原位β-SiC晶须的数量,反而降低了样品的抗折强度。Self-bonded SiC materials were prepared by the carbon-buried method usingα-SiC as aggregates,Si powder and graphite as matrix phases.The effect of content of coarseα-SiC aggregates on phase composition,microstructure and properties of the materials was investigated.Results indicated that the increasing ratio of coarseα-SiC particles helped to reduce the amount of pores and promote densification.But reducing the pores inhibited the carbothermal reduction of SiO_(2),decreasing the amount of in-situβ-SiC whiskers and reducing the bending strength of the samples.

关 键 词：埋粉烧结法 β-SiC晶须 力学性能 碳热还原反应 

分 类 号：TQ174.75[化学工程—陶瓷工业]