1. A process for forming on a substrate a ceramic coating which process comprises: (A) applying to the substrate a flowable solution of a mixture comprising hydrogen silsesquioxane resin and a metal oxide precursor selected from the group consisting of acyloxy and alkoxy compounds of aluminum, titanium, and zirconium wherein the metal oxide precursor is present in such proportion so that the metal oxide is present in the ceramic coating produced in step (C) at about 0.1 to about 30 percent by weight; (B) drying the resin solution to deposit a preceramic coating on the substrate; and (C) heating the coated substrate in a substantially ammonia atmosphere to a temperature sufficient to produce a ceramic coating on the substrate.