Abstract—
We have studied the effect of heat treatment temperature on dilatometric and densimetric characteristics (geometric dimensions, volume, density, and weight) of plasma-sprayed pure aluminum oxide ceramics using specially prepared samples 46 × 23 × 3 mm in dimensions. Some of the samples were heat-treated at temperatures of 800, 950, 1100, and 1300°C for 1 h in air. Before and after heat treatment, the samples were weighed and we measured their geometric dimensions and calculated their volume and density. In our experiments, we used precision analytical and measuring equipment and thermal analysis methods. The phase composition of the samples was determined by quantitative X-ray diffraction. Their porosity was evaluated using X-ray computed tomography. The results demonstrate that raising the heat treatment temperature leads first to an increase in the length of the samples under study relative to their original length, which is accompanied by a decrease in their thickness (in the range 800–1100°C). The volume and density of the samples also decrease. Further raising the heat treatment temperature (in the range 1100–1300°C) leads to a sharp decrease in all the geometric dimensions and volume of the samples, in combination with a sharp increase in their density, which is accompanied by a decrease in the weight of the samples. This was shown to be due to changes in the phase composition and total porosity of the samples during heating to the above temperatures.
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This work was supported by the RF Ministry of Science and Higher Education (state research target, project no. 0718-2020-0037).
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Belyaev, I.V., Stepnov, A.A., Mogil’nikov, P.S. et al. Effect of Heat Treatment Temperature on Dilatometric and Densimetric Characteristics of Plasma-Sprayed Al2O3 Ceramics. Inorg Mater 58, 744–750 (2022). https://doi.org/10.1134/S0020168522070044
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DOI: https://doi.org/10.1134/S0020168522070044