Establishment of Russian Academy of Sciences I. V. Tananaev Institute of Chemistry and Technology of Rare Elements and Mineral Raw Materials of the Kola Science Centre of Russian Academy of Sciences

M. N. Palatnikov, Head of Laboratory, e-mail: palat_mn@chemy.kolasc.net.ru

O. B. Shcherbina, Scientific Associate

N. V. Sidorov

Frantsevich Institute for Problems of Material Scince of the National Academy of Sciences of Ukraine

A. A. Frolov, Leading Scientific Associate

E. G. Kirkova, Scientific Associate

The subject of this work is the effect of concentrated light flux treatment on mechanical and spectral properties, and heat shock resistance (in a wide temperature range) of refractory ceramic tantalum and niobium pentoxides. The physical and chemical aspects of creating new layered ceramic materials and possible ways of enhancing the thermal resistance of articles on their basis have been examined. There have been developed the physical and chemical principles of creating containers for thermal and chemical processing of high-purity compounds, remarkably resistant to heat shock in a wide temperature range. As revealed by mathematical modeling of stress distribution in layered ceramic material with a quartz ceramic base and bilateral niobium (tantalum) pentoxide protective coating, the stress value at the base-to-coating interface can be decreased and, accordingly, the samples’ thermal stability increased by splitting the layer into fragments (to diminish the continuous interface area) and smoothing over the base fragments’ sharp corners. It has been shown that the synergetic effect can only be achieved by combining certain techniques (employing layered ceramic; proper choice of the coating base material; treating the coating material with a concentrated light flux to produce fractal-type micro- and nanostructures with the formation of a partly-isle niobium (tantalum) pentoxide structure, damping the thermal expansion; splitting the material base into fragments with smoothed edges; and an emerging in-depth anisotropy of mechanical properties of the coating material). This permits to create ceramic containers highly resistant to heat shock over a wide temperature range (Т_room — 1000 ^оС).

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