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High-Temperature Measurements of Macroscopic Deformation Induced by Phase Changes: Application to Bauxite-Based Material

A. Coulon, E. de Bilbao, S. Brassamin, J. Poirier

Journal of Ceramic Science and Technology, Vol. 9, No. 2 (2018), pp. 119-126

DOI: 10.4416/JCST2017-00085

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Abstract

High-temperature measurements of macroscopic deformation are of great interest for better understanding the behaviour of materials used in high-temperature processes. However, such measurements are still challenging when performed on very heterogeneous materials such as the bauxite-based material studied here. In this work, a high-resolution camera is used in combination with a high-temperature furnace to monitor the change in size of a bauxite-based sample. The technique is applied to measure the change in diameter induced by phase transformation of the material and by the impregnation of molten oxides. The decrease in diameter owing to solid-liquid sintering has been assessed to 5 % and the formation of the expansive phases CaO·6(Al2O3,Fe2O3) and CaO·2(Al2O3,Fe2O3) makes the diameter increase by 0.5 and 5 %, respectively. It is also possible to identify the temperatures at which the transformations occur. The technique may be used to study the effect of corrosion on macroscopic deformation of refractories.

Keywords

Refractory materials, contactless measurement, deformation, high temperature, phase transformation

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