磷酸盐低温烧结高强度SiC泡沫陶瓷及性能研究  

Properties of High Strength Silicon Carbide Foamed Ceramics by Phosphate Low-temperature Sintering

作　　者：孙文飞[1,2] 刘卫[1,2] 黎阳[1] 

机构地区：[1]贵州师范大学材料与建筑工程学院,贵阳550025 [2]贵州大学材料与冶金学院,贵阳550025

出　　处：《人工晶体学报》2017年第6期1038-1042,共5页Journal of Synthetic Crystals

基　　金：国家自然科学基金(51462004);贵州省教育厅自然科学研究项目黔教合KY字[2015](363)号;白云区科技局项目[2013]40号

摘　　要：通过有机模板复制法,以磷酸二氢铝为粘结剂,950℃烧成制备了高强度SiC泡沫陶瓷。研究了浆料中SiC含量和磷酸二氢铝含量对SiC泡沫陶瓷微观结构与性能的影响。结果表明:SiC微粉由A型Al(PO_3)3粘结起来,烧成泡沫陶瓷通孔结构良好,开气孔率介于75%~91%之间。随着磷酸二氢铝含量的增加,烧成泡沫陶瓷的线收缩率、体积密度和抗折强度均逐渐增加,而开气孔率则逐渐减小;随着SiC含量的增加,烧成泡沫陶瓷的线收缩率和开气孔率均逐渐减小,而体积密度和抗折强度则逐渐增加。磷酸二氢铝含量为40%、SiC含量为60%时,泡沫陶瓷的抗折强度达(2.22±0.26)MPa。High strength silicon carbide foam ceramics were fabricated at 950 ℃ by polymer sponge replicas method with aluminum dihydrogen phosphate as blinder. The effect of SiC contents and aluminum dihydrogen phosphate on microstructure and properties of the silicon carbide foam ceramics were investigated. The results show that the SiC particles were bonded by A-Al（PO3 ）3. The open celI porosity structure of silicon carbide foam ceramics was well-formed, the open porosity was from 75 % to 91%. As the aluminum dihydrogen phosphate content increases, the linear shrinkage, volume density and flexural strength gradually increases, while the open porosity decreases. As the solid content increase, the linear shrinkage and open porosity declines, while the volume density and flexural strength gradually climbes. In particular, the flexural strength of silicon carbide foam ceramics is （2.22 ± 0.26） MPa when the aluminum dihydrogen phosphate and SiC contents were 40% and 60%, respectively.

关 键 词：磷酸二氢铝 碳化硅泡沫陶瓷 低温烧结 抗折强度 

分 类 号：TQ174.12[化学工程—陶瓷工业]