Synthesis, sintering and expansion of Al0.8Mg0.6Ti1.6O5: a low-thermal-expansion material resistant to thermal decomposition

Author： Buscaglia V. Caracciolo F. Leoni M. Nanni P. Viviani M. Lemaitre J.

Publisher： Springer Publishing Company

ISSN： 0022-2461

Source： Journal of Materials Science, Vol.32, Iss.24, 1997-12, pp. : 6525-6531

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Abstract

A low-thermal-expansion ceramic with the composition Al0.8Mg0.6Ti1.6O5 that is isostructural to aluminium titanate Al2TiO5, was prepared by solid-state reaction of a mixture of α-Al2O3, MgO and TiO2-rutile. The synthesized material does not decompose after annealing for 250 h in the temperature range of 900–1175°C. The ceramic sintered at 1350°C has a 97% relative density, a grain size of ≈5 μm and an average thermal expansion coefficient between 80 and 1000°C of ≈2×10-6 K-1. Materials with the same composition, but obtained by reaction sintering, have a higher thermal expansion coefficient (4×10-6 K-1) and showed the presence of secondary phases.