Formation of α-Al2O3 from Al(OH)3 in the Presence of Seed Particles and Its Sinterability

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Abstract
Effect of wet grinding of commercial aluminum hydroxide on the transformation to α-alumina during heating was investigated using vibration ball mill. The grinding with high purity alumina balls reduced the transformation temperature to α-alumina by 300°C. Such significant reduction in the transformation temperature was not observed in the samples obtained by the grindings with zirconia and low purity alumina balls. The formation of α-alumina from ground aluminum hydroxide at such a low temperature was possibly attributed to a seed-effect of fine α-alumina powder worn from the balls and its uniform mixing with the mother powder during grinding. The α-alumina powder made from ground aluminum hydroxide consisted of very fine particles, which enabled us to sinter at a relatively low temperature. The sintered bodies had fine-grained structure without abnormal grain growth.

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