“…And it has excellent physical and electrical properties, such as the wide band gap, high electrical breakdown field high thermal conductivity, high surface hardness, high bulk plasticity, high saturated electron velocity and so on, which make SiC suitable for high-power, high-frequency, hightemperature applications, surface coating, as well as corrosionresistant coating [3]. Amorphous SiC, porous crystalline SiC, nanometre SiC and so on were investigated, and great progress has been made in their investigation [4,5].…”