SiC／莫来石复相多孔陶瓷气孔率和强度的影响因素  

Influence Factors on the Porosity and Strength of SiC /mullite Composite Porous Ceramics

作　　者：景亚妮[1] 邓湘云[1,2] 李建保[1,3] 白成英[1] 蒋文凯[1] 李誉[1] 刘张敏 

机构地区：[1]热带岛屿资源先进材料教育部重点实验室,海南大学,海口570228 [2]物理与电子信息学院,天津师范大学,天津300387 [3]清华大学材料科学与工程系,北京100084

出　　处：《硅酸盐通报》2013年第10期1979-1983,共5页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金资助项目(50872093);国家高技术研究发展计划(863计划)项目(2012AA03A610)

摘　　要：以煅烧高岭土、Al(OH)3粉末、SiC粉末为主要原料,以石墨为造孔剂制备了SiC/莫来石复相多孔陶瓷,研究了造孔剂含量、碳化硅颗粒粒径以及烧结温度对SiC/莫来石复相多孔陶瓷抗弯强度和气孔率的影响,并分别用XRD和SEM分析晶相组成和断面显微结构。结果表明:当SiC粒径为60μm,造孔剂含量为15%时,在1400℃下保温3 h制备的样品综合性能最佳,其孔隙率为30.3%,抗折强度达到58.0 MPa。SiC/mullite composite porous ceramics were prepared from calcined kaolin, aluminum hydroxide powder and SiC powder, with graphite as pore-forming. The influence of pore-forming agent contents, SiC particle sizes, and sintering temperatures on the porosity and flexural strength of SiC/ mullite composite porous ceramics were investigated. The grain phases and the fracture surface micrograph were analyzed with XRD and SEM, respectively. The results show that the sample sintered at 1400 ℃ for 3 h with SiC particle sizes is 60 μm and 15% graphite as the pore-forming agent exhibits the most excellent properties： flexural strength of 58.0 MPa was achieved at a porosity of 30.3%.

关 键 词：复相多孔陶瓷 抗弯强度 气孔率 

分 类 号：TQ174[化学工程—陶瓷工业]