Bulg. J. Phys. vol.27 no.S3 (2000), pp. 136-139



Thermal Expansion of Al2TiO5-MgO Ceramics

M. Ivanova, L. Stefanovska, S. Popjanev, M. Milosevski
Faculty of Technology and Metallurgy, University
Abstract. Aluminium titanate ceramics possesses physical properties that make it an attractive material for specialized applications. A limiting factor is their tendency to decompose in certain time/temperature range. In order to improve the mechanical characteristics of aluminum titanate ceramics (synthesized from equimolar amounts of Al3O3 (corundum) and TiO2 (rutil)), or to increase the material stability at the heating-cooling conditions, MgO additive has been applied. In this study the temperature dependence of the thermal expansion of Al2TiO5-MgO ceramic heated to the range of maximal temperature of 1300℃ followed by cooling to the room temperature (20℃), was observed. The temperature dependence of the relative sample length change during heating/cooling process can be presented in the form of graphs and by an empirical third order polynome.

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