Patent ID: 7494693

Claim:
A process for producing ceramic thin film coating material having a slope constitution, which comprises a base material and a ceramic thin film comprising a composite phase composed of a first phase mainly formed of a silicon ceramic component and a second phase mainly formed of a ceramic component other than the silicon ceramic component of the first phase, in which the amount of fine crystal particles of at least one ceramic component that constitutes the second phase slopingly increases toward a surface layer, the base material being coated with the ceramic thin film, which process comprises coating a base material with a) a modified organosilicon polymer having a structure obtained by modifying an organosilicon polymer with an organometallic compound, b) a mixture of an organosilicon polymer with an organometallic compound, or c) a mixture of said modified organosilicon polymer with an organometallic compound, carrying out a predetermined heat treatment, and calcining the resultant base material at a temperature in the range of from 1200 to 1,800° C. in an oxidizing atmosphere, an inert atmosphere or a nitrogen-containing atmosphere.