科研之友
微信
新浪微博
Facebook
分享链接
摘要
In order to reduce the generation of cracks and pores during the pyrolysis process of precursor-derived ceramics, the effects of the inert filler of nano-sized SiC powders on the precursor polymer, precursor-derived ceramics volume shrinkage, ceramic yield were studied. The features of precursor-derived ceramics with different mass fractions of SiC filler were examined by TGA, FT-IR and XRD technologies, and the volume shrinkage of the ceramics was measured by drainage method. The results showed that with the increasing mass fraction of SiC powders, the volume shrinkage of the precursor-derived ceramics decreased, while the yield of the ceramics increased. When the mass fraction was 3%, the volume shrinkage rate of the ceramics was down to the minimum value of 73.47% and the yield was up to the maximum one of 26.42%. During the pyrolysis process, when the heating rate was 4 ℃/min, the surface of the precursor-derived ceramics was flat and smooth without evident cracks. Therefore, the inert filler of the nano-sized SiC powders has great effects on reducing the volume shrinkage of precursor-derived ceramics and increasing the ceramic yield.
- 单位
