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T. M. ULYANOVA, N. P. KRUTKO, Yu. V. MATRUNCHIK, and O. Yu. KALMYCHKOVA
«Interaction of Nanostructure Alumina and Al2O3SiO2MgO Silicate Matrix»
605–611 (2008)

PACS numbers: 07.20.Hy, 61.10.Nz, 61.46.+w, 61.72.Ff, 81.05.Ni, 81.07.-b, 82.33.Pt

The influence of nanocrystalline fibrous alumina additives on the structure and properties of ceramic material based on cordierite matrix is investigated. The material is synthesized from highly-dispersed natural mineral powders, i.e., clay, talc and industrial alumina, which form cordierite matrix during an annealing at temperatures higher than 1200?. Investigation of phase composition shows that, in process of composite heat treatment, the solid-phase reactions took place, and mullite and aluminamagnesia spinel are formed between oxide fibres and matrix that results in composite-strength increase. As established, the introduction of additives of Al2O3 nanocrystalline fibres into composition mixture of powders of natural materials and alumina raises porosity and heat resistance of composite and lowers its heat conductivity. These properties permit the use of this ceramic composite for induction-furnace isolation.

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