This paper describes experiments in depositing p-Sic film onto SIC ceramics using a chemical vapor deposition surface treatment technique. The experimental results show that the best conditions for producing p-Sic thin film are not at a specific "point" but rather within a "region" in the C/Si-T graph; that X-ray diffraction can be used to monitor the thickness of the thin film; and that, for Sic ceramics, surface treatment can improve fracture strength (by about 20%), oxidation resistance (by a factor of about 5 ) , and resistance to heat damage. A simple model based on surface healing is presented, and two conditions for modifying ceramics are given.