QUARTZ GLASS CERAMICS FOR HEAT PROTECTION AND HIGH-TEMPERATURE TECHNOLOGIES

Y.V. Voynich, G.A. Frolov, V.S. Tsyganenko

It is shown, that in the quartz glass ceramics alloyed by chrome oxide at temperatures above 1800 K the opaque layer providing simultaneous increase of radiating ability, decrease of ablation and attenuation of passing microwave frequency signal is formed. Possibility of use of quartz glass ceramics in high-temperature technologies is considered on an example of the development of layered ceramic product with built-up pentaoxide niobium coating. Thermostability of the layered big size products is raised. They are intended for replacement of platinum crucibles at reception of high-clean LiNbО₃ and LiTaO₃ compositions for electronics in industrial conditions.

Key words: heat protection, high temperature heating, chrome oxide, radiolucent, thermostability, ceramic crucible, protection coating.