摘要
以冰晶和聚苯乙烯(PS)微球为模板,微米级SiC粉体为原料,通过双模板法制备了具有三级孔径分布的多孔SiC陶瓷。研究了SiC的固含量和PS微球的大小对多孔SiC陶瓷的微观形貌、孔隙率和压缩强度的影响。研究结果表明:分级孔结构的多孔SiC陶瓷具有冰模板升华后遗留下的对齐排列的大孔、分布于孔壁中的由PS微球热解留下的中孔和颗粒之间堆积形成的小孔。随着SiC固相含量的增加,大孔孔径和孔容降低,但压缩强度增加。当PS微球粒径约为0.90μm时,中孔孔径分布在0.7～1.5μm之间;当PS微球粒径约为2.51μm时,孔径分布较宽,约为1～3μm。
Hierarchically porous SiC ceramics were fabricated by combined freeze-casting method with direct foaming method using dual sacrificial template technique. The influences of SiC solid content and the size of polystyrene （PS） microspheres on pore morphology, porosity and compressive strength of porous SiC ceramics were investigated. The porous SiC had a unique microstructure, where aligned interconnected lamellar pores and spherical pores distributed in the internal walls of SiC matrix. The aligned large pores were generated by sublimation of ice template and the spherical pores were caused by decomposing the PS microspheres. The pore structure was controlled by selecting the solid content of SiC, content and size of PS microspheres. As the solid content of SiC increasing, the size and pore volume of large lamellar pore decreased, but the compressive strength increased. As the size of PS micropheres is 0.90 μm, the pore size distribution at the range of 0.7 to 1.5μm, as the size of PS micropheres is 2.51 μm, the pore size distribution at the range of 1 to 3 μm.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2013年第4期664-670,共7页
Journal of Synthetic Crystals
基金
国家自然科学基金(21061012
51061015)
浙江省重中之重学科开放基金(20110922)
教育部科学技术研究重点项目(210236)
关键词
碳化硅陶瓷
固相含量
孔径分布
压缩强度
SiC ceramics
solid content
pore size distribution
compressive strength
