摘要： 采用聚碳硅烷和 SiC 粉体为原料低压成型低温烧结制备 SiC 多 孔陶瓷，研究了聚碳硅烷含量对 SiC 多孔陶瓷性能的影响。SEM 分析表 明，聚碳硅烷裂解产物将 SiC 颗粒粘结起来，多孔陶瓷具有相互连通的 开孔结构。 烧成 SiC 多孔陶瓷的孔隙孔径为单峰分布、分布窄，室温至 800 ℃之间多孔陶瓷的平均热膨胀系数为 4.2×10^-6 K^-1。 随着聚碳硅烷 含量的增大，SiC 多孔陶瓷的孔隙率降低、三点弯折强度增大，当聚碳 硅烷质量分数为 10%时分别为 44.3%和 31.7MPa。 

关键词：多孔陶瓷；前驱体；低温烧结

Abstract： The SiC micro-sized powder and polycarbosilane （PCS） were used as the starting materials，molded at low pressure and then sintered at low temperature to prepare porous SiC ceramics. The effects of PCS con tent on the properties of porous SiC ceramics were studied. The SEM im ages showed that the SiC particles were bonded by PCS pyrolysis products and the porous SiC ceramics possessed connected the open pores. The pore size distribution took on a unimodal and narrow distribution. The average coefficient of thermal expansion from room temperature to 800 ℃ was 4.2×10^-6 K^-1. With the increase of PCS content，the porosity of the porous SiC ceramics decreased，but the flexural strength increased，which were 44.3 % and 31.7MPa respectively when PCS content was 10 %（mass frac tion）. 

Keywords：porous ceramics；precursor；low temperature sintrering