It was found that the high decomposition temperature of amorphous Al(OH)3 makes it possible to sinter corundum ceramics directly from aluminum hydroxide, bypassing the stage of its preliminary thermal dehydration. Using the cold isostatic pressing method at 200, 600, and 1000 MPa, compacts with densities of 62, 69, and 79% of the theoretical value were obtained. The temperature dependence of the shrinkage of amorphous Al(OH)3 compacts was studied as a function of the cold isostatic pressing pressure. An area of intense shrinkage was discovered in the range 1050 – 1150°C, which coincides with both the temperature of complete decomposition of amorphous Al(OH)3 and the transition γ → α-Al2O3.
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Translated from Steklo i Keramika, No. 12, pp. 31 – 34, December, 2023.
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Prilipko, S.Y., Volkova, G.K., Loladze, L.V. et al. Sintering of Amorphous Al(OH)3 Using Cold Isostatic Pressing. Glass Ceram (2024). https://doi.org/10.1007/s10717-024-00645-6
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DOI: https://doi.org/10.1007/s10717-024-00645-6