佐藤根 大士

For the purpose of this work, several types of waste coolants from fixed-abrasive wire sawing (FAS) were filtrated, and the characteristics of the coolants and the retrieved solid materials were investigated. The all coolants consisted of water and glycol series with the boiling temperature of around 200°C. However, the viscosity of each coolant were different due to the difference in the ratio of coolant components. Experimental results of pressurized filtration can be explained by a rate equation which we proposed. The concentration of diamond in the retrieved solid materials was less than 0.2wt%. Metal contents in the retrieved Si were measured by an inductively coupled plasma mass spectrometry (ICP-MS). The result indicated that quality of the retrieved Si is sufficient for the use as feedstock. The shaped Si was easily melted in a resistance heating furnace. We concluded that the Si powders in waste coolants from FAS can be used as feedstock. © 2012 IEEE.

スラリー中の粒子の分散、凝集状態を決定する重要な因子の1つであると考えられている、粒子に対する分散剤の吸着量に関して、本研究室では幅広い範囲で粒子濃度、分散剤濃度を変えてスラリーを調製し、分散剤吸着量の測定実験を行ったが、吸着量が平衡時の上澄み中の分散剤濃度に依存するという一般の物理吸着とは異なり、吸着量は粒子濃度によらず単位粒子質量あたりの分散剤添加量のみに依存するという結果が得られた。また、吸着した分散剤は、溶液中の高分子濃度やスラリーのpHを変化させても脱着しないということも明らかになった。これより、スラリー中では粒子と分散剤は不可逆的に強く吸着していると考えられる。