摘要
采用3种粒度的α-SiC颗粒为骨料,以硅粉、石墨粉为合成β-SiC基质的原料,通过埋碳烧成法制备反应烧结碳化硅材料。研究了成型压力对反应烧结SiC的相组成、微观结构以及性能的影响,采用XRD、SEM等测试手段对材料的组成、结构与性能进行了表征。研究结果表明:β-SiC晶须是通过气固机制合成,其合成反应抑制了结构致密化。随着成型压力的增加,致密度升高,β-SiC晶须生成量呈减少趋势。成型压力为12 MPa时制备的材料性能最优,其中吸水率为8.37%,气孔率21.08%,体积密度为2.37 g/m^3,抗折强度达到40.7 MPa,断裂韧性为0.42 MPa·m1/2。
Reaction-bonded silicon carbide ceramics were prepared by using a carbon-buried sintering method,withα-SiC powders of different sizes as the aggregates and silicon and graphite powders as the matrix-phases for in-situ formation ofβ-SiC.The effect of molding pressure on phase composition,microstructure and properties of the reaction-bonded SiC ceramics was studied.The samples were characterized by using XRD and SEM.It is found thatβ-SiC whiskers were formed through the gas-solid reaction mechanism,while the reaction suppressed the densification process.The content ofβ-SiC whiskers was decreased and the density was increased with increasing molding pressure.When the molding pressure was 12 MPa,the sample showed optimum properties,with water absorption rate of 8.37%,porosity of 21.08%,bulk density of 2.37 g/m3,flexural strength of 40.7 MPa for and fracture toughness of 0.42 MPa·m1/2.
作者
劳新斌
李亚格
江伟辉
刘健敏
梁健
刘雪枫
唐紫娟
LAO Xinbin;LI Yage;JIANG Weihui;LIU Jianmin;LIANG Jian;LIU Xuefeng;TANG Zijuan(National Engineering Research Center for Domestic and Building Ceramics,Jingdezhen 333001,Jiangxi,China;School of Materials Science and Engineering,Jingdezhen Ceramic Institute,Jingdezhen 333403,Jiangxi,China)
出处
《陶瓷学报》
CAS
北大核心
2020年第5期656-661,共6页
Journal of Ceramics
基金
National Natural Science Foundation of China(51702141,51962012,51962014)
Jingdezhen Science and Technology Bureau Planning Project(20182GYZD011-07)
Jingdezhen Ceramic University College Students Innovation and Entrepreneurship Training Program(21305004-064).