纳米SiC粉末对先驱体陶瓷增材性能的影响

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

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.

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.