Coating agent for protecting ceramics or glass against thermal oxidation comprises a phosphorous silicate nanosol which is a hydrolysis product of metal alkoxides or metal halides and acidic organophosphate solution

摘要

Coating agent comprises a phosphorous silicate nanosol which is a hydrolysis product of metal alkoxides or metal halides and an acidic organophosphate solution. An Independent claim is also included for a process for the production of a transparent coating comprising producing an acidic organophosphate precursor solution (I); producing an acidic phosphorus silicate nanosol (II) by mixing (I) with metal oxides or metal halide sols or their precursors; coating the substrate with the nanosol; drying the coating to form a gel layer; and heat treating the gel layer at at least 440 deg C.