Formation of graduated layers at the surface of ceramics and steels in a high-enthalpy gas stream

It was established by experiment that the failure rate for quartz glass-ceramics with fusion in a high-enthalpy gas stream depends markedly on the thermal conductivity of the surface layer, which may be reduced by excluding the radiation component of heat transfer through the alloying of material with, for instance, chromium oxide. It is possible to use plasma streams to form on the surface of steels the wear resistant refractory coatings based on borides and carbides.