湿式回転ボールミルを用いたα-アルミナ粉末のサブミクロン粉砕におけるポリアクリル酸アンモニウムの添加効果

概要

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The wet grinding of α-alumina powder with water is known to cause formation of aluminum tri-hydroxide on the particle surface of the powder by mechanochemical effects. The present authors have found that wet submicron-grinding of α-alumina powder using polyacrylic ammonium (PAN) as a dispersant can be performed without generation of hydroxide on the particle surface. In this study, the relationship between the amount of PAN and the formation of aluminum tri-hydroxide in wet rotation ball milling of α-alumina powder using water as a solvent was investigated. Without addition of PAN, hydroxide generated on the particle surface of α-alumina powder after 24-h grinding. On the other hand with the addition of 1.7 mass% PAN, hydroxide did not generate after 168-h grinding. PAN was considered to be absorbed onto the AlOH_2^+ sites of the particle surface of α-alumina powder and, thus, to disturb the generation of hydroxide. Grinding efficiency was not improved by addition of PAN during submicron grinding.
社団法人日本セラミックス協会の論文
1998-11-01