電子材料用セラミックス原料の微粉砕とその応用に関する研究開発

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Kenji Tanaka, Isamu Inada and Kiichi Minai : Developments in Submicron Grinding of BaTiO powder by Ball Milling and its applications. Submicron grinding of BaTiO3, powder was studied by a ball mill with small balls of 0.75mmt to 30mmφ . BaTiO3 clinker, which was obtained by calcining an equimolor mixture of TiO2 and BaCO3 was preground to 1.8 am. Submicron grinding of the BaTiO3 powder was possible by ball milling with several mmφ balls. For a ball diameter of 2mm, the specific surface area was maximumized. Effect of specific gravity of balls was studied by a ball mill with 2mmφ and 5mmφ balls. It was shown that submicron grinding of BaTiO3 powder was possible in short time. The higher the specific gravity of ball, the higher the effect of grinding was. The effect of fine grinding of BaTiO3 powder and additives was investigated. Slurry prepared from the BaTiO3 powder and additives were sheeted with a doctor blade system. The microstructures of the green and sintered body were analyzed by SEM and XMA. Fine grining caused an improvement in sheet formation and subsequent sintering. An increase in grinding time resulted in a decreasing porosity of the green sheet and an increasing density of the sintered body.
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