纳米SiC粉末对先驱体陶瓷增材性能的影响

为了减少先驱体陶瓷在高温裂解过程中裂纹及孔隙的产生，研究了惰性填料纳米SiC粉末对先驱体聚合物、先驱体陶瓷体积收缩率、陶瓷产率的影响.利用热重分析(TGA)、傅里叶转化红外线光谱(FT-IR)、X射线衍射(XRD)等检测手段进行性能分析和结构表征，采用排水法计算先驱体陶瓷体积收缩率.结果表明:先驱体陶瓷的体积收缩率随纳米SiC粉末质量分数的增加而减小，先驱体陶瓷产率随纳米SiC粉末质量分数的增加而增加，当其质量分数为3%时，体积收缩率最小，为73.47%，先驱体陶瓷产率最大，为26.42%;在高温裂解过程中，当升温速率为4℃/min时，先驱体陶瓷表面无明显裂纹且平整光滑.SiC粉末作为惰性填料具有减少先驱体陶瓷体积收缩，提高陶瓷产率的作用，且效果明显.

Effect of Nano-Sized SiC Powder Filler on Additive Manufactured Properties of Precursor-Derived Ceramics

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.