Abstract
Aluminium titanate (Al 2TiO 5) is a promising engineering material because of its low thermal expansion coefficient, excellent thermal shock resistance, good refractoriness and non-wetting with most metals. However, it is susceptible to thermal dissociation in the temperature range ∼1100–1300 °C which degrades its desirable properties. In this work, the effect of atmospheres (i.e., air, argon, 50% oxygen/50% argon) on the isothermal stability at 1100 °C as well as the thermal instability of Al 2TiO 5 in the temperature range 20–1400 °C has been characterized by neutron diffraction to study the temperature- and time-dependence microstructural changes in real time. Results show that the thermal stability of Al 2TiO 5 is strongly influenced by both temperature and atmosphere, but the temperature range of thermal instability is not dependent on the ageing atmosphere.
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