【摘要】 利用X射线衍射、扫描电镜和能谱分析等手段研究了原料组成和氩气流量对铁尾矿合成SiC粉末相组成和显微结构的影响.研究结果表明产物中主晶相为β-SiC,杂质相主要是FexSiy,其中SiC多以柱状形式存在.随着n(C)∶n(SiO2)的增加,产物中SiC的相对含量逐渐增大.在n(C)∶n(SiO2)为4时,SiC的相对含量达最大值(82%左右),随后SiC的相对含量随着其增大而减小.产物中SiC的相对含量随着氩气流量的增加而降低.更多还原

【Abstract】 The effects of raw materials composition and Ar flux on the phase composition and microstructure of SiC powder synthesized from iron ore tailings were studied by means of XRD,SEM and EDX（energy dispersive X-ray）. The results showed that the main phase of product samples is β-SiC with Fe_xSi_y phase as impurity,where the SiC is mostly in columnar form. The relative content of SiC in samples increases gradually with the increasing mole ratio of SiO₂ to C. When the ratio is 4,the relative content of SiC reaches the maximum （ about 82%）,then SiC content decreases if the ratio exceeds 4. On the other hand,the relative content of SiC decreases with increasing of Ar flux.更多还原