Ion beam assisted deposition (IBAD) based on End-Hall source was introduced to fabricate a Si coating on RB-SiC substrate. High-quantity surface photograph
surface scattering at 635nm and reflectance spectrum were measured at room temperature. The results showed that films became loose under fast deposition rates. The coefficient of surface scattering was decreased from 3.56% to 1.46% after surface modified polish by Si coating
which was approximate to the scattering level of Zerodur glass. The temperature and surface tensile experiment indicated that Si coating was combined well with the SiC substrate.