Method of preparing vitreous ceramic composition suitable for coating ceramic articles

摘要

A vitreous ceramic composition for coating ceramic articles with a zinc and alumina base capable of separating rapidly up to 50% of crystalline phase consisting essentially of gahnite. The percentages by weight of the principal ingredients of the composition are the following. SiO2 30-50%; Al2O3 10-25%; ZnO 8-25%; B2O3 5-20%; TiO2 0-7%; other selected oxides can be added to change the fusability characteristics and heat expansion coefficients on the basis of specific applications of the composition.