Modification of nanodisperse SiC-powder properties by changing the conditions of Si(CH3)4-gas phase pyrolysis

According to the aim of the paper to modify the properties of finedisperse SiC-powders by changing the parameters of synthesis, i. g. to obtain “tailored” powders, the formation of SiC-powders by Si(CH 3 ) 4 –(TMS)pyrolysis was investigated in a shock tube. By shock wave pyrolysis of TMS at times of 10 −3 s and temperatures of 1 × 10 3 − 3 × 10 3 K nanodisperse β-cristalline SiC-powders with a size distribution of 2 … 34 nm were obtained. The results demonstrate a distinct dependence of powder properties on pyrolysis parameters – a decrease of particle size resp. an increase of particle cristallinity with increasing temperature. An increase of the time of pyrolysis gives rise to an increase of the particle size. The obtained results indicate that the powder properties are mainly determined by the quenching resp. the nucleation process.