Kinetics of formation of ZrB2-MoSi2 glass-ceramic heat-resistant coatings on graphite

Abstract

Coatings on graphite with a high heat resistance at a temperature of 1400 ° C in an air atmosphere are prepared on the basis of the ZrB 2 -MoSi 2 -SiO 2 system. It is demonstrated that the sealing vitreous layer is formed through oxidation of the composite components. The kinetic analysis of oxidation processes of the ZrB 2 -MoSi 2 composite shows that the coating formation results from a set of concurrent and consecutive chemical reactions. The stages of forming the gas-impermeable layer are revealed, the schemes for oxidation reactions are proposed, and the kinetic parameters of reactions are determined.

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