Not like Reaction bonded SiC, there's no free of charge silicon present. These direct sintered materials haven't any metal phase and they are for that reason a lot more resistant to chemical assault. 纯的碳化硅是无色的，工业用碳化硅由于含有铁等杂质而呈现棕色至黑色。晶体上彩虹般的光泽则是因为其表面产生的二氧化硅钝化层所致。 These finishes provide minimal coefficients of friction and co... https://cdn-cgi-l-email-protectio05814.csublogs.com/36273545/not-known-factual-statements-about-180-grit-silicon-carbide-powder