Si粉目数对自结合SiC陶瓷材料结构及性能的影响  

Effects of Si Powder Mesh Number on Structure and Properties of Self-bonded SiC Ceramics

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 Institute,Jingdezhen 333000,China;Wuhan University of Science and Technology,School of Materials Science and Engineering,Wuhan 430000,China)

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》2022年第3期17-21,共5页China Ceramics

基　　金：国家自然科学基金项目(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(GJJ190709、GJJ190714)。

摘　　要：采用α-SiC骨料、Si粉和石墨为主要原料,经1500℃埋碳烧成制备了自结合SiC陶瓷,并利用XRD和SEM等方法探讨了Si粉目数对材料的组成、结构、室温强度及高温强度的影响。结果表明,当Si粉目数为300目时,β-SiC晶须形貌最优,样品的高温强度(48.7 MPa)大于室温强度(46.8 MPa)。Si粉目数小于300目时,Si粉活性低,不利于β-SiC合成;Si粉的目数大于300目时,反应活性较高,导致SiO气体分压过大和材料气孔率的提高。Self-bonded SiC ceramics were prepared by usingα-SiC aggregates,silicon powder and graphite as main raw materials and sintering at 1500℃with buried carbon.The effect of Si powder mesh on phase composition,structure and room-temperature strength and high-temperature strength of the materials were studied by XRD and SEM,etc.Results indicated that,when the Si powder was under 300 mesh,the morphology ofβ-SiC whiskers was the optimum,and the high-temperature strength of the samples(48.7MPa)was higher than the room-temperature strength(46.8 MPa).When the Si powder mesh was smaller than 300 mesh,the reactivity of Si powder was low,being detrimental for the synthesis ofβ-SiC;When the Si powder mesh was higher than 300 mesh,the reactivity of Si powder was high,resulting in the serious increases of SiO gas pressure and porosity.

关 键 词：自结合SiC陶瓷 Si粉目数 β-SiC晶须 室温强度 高温强度 

分 类 号：TQ174.758.12[化学工程—陶瓷工业]