Oxidation of the Zirconium BorideSilicon Nitride Composite
in the Temperature Range 11001300C in Air

A. P. Salikova, I. B. Ban’kovskaya*, D. V. Kolovertnov, and V. P. Popov

Grebenshchikov Institute of Silicate Chemistry, Russian Academy of Sciences,
nab. Admirala Makarova 2, St. Petersburg, 199034 Russia

*e-mail: inbankov@iscl.nw.ru

Received June 24, 2009

Abstract—Composite materials and coatings based on zirconium boride and silicon nitride have been prepared
by heat treatment of mixtures of the initial components in air. The chemical reactions result in the formation of
the glass melt encapsulating initial particles, which provides an increased heat resistance of the material. The
kinetics of high-temperature oxidation of the composite based on the ZrB₂–Si₃N₄ system has been studied. The
interaction between solid components of the ZrB₂–Si₃N₄ system, atmospheric oxygen, and the glass melt has
been described in terms of the formal kinetic equations for heterogeneous processes. Thermogravimetric, ther-
mal, and X-ray powder diffraction analyses have been carried out, and the electrical resistivity of the compact
samples has been determined.

Key words: zirconium boride, silicon nitride, glass-forming melt, the reaction of formation, coatings on graph-
ite

DOI: 10.1134/S1087659610020112

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