媒体かく拌ミルによる湿式粉砕における媒体の摩耗について

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Contamination content in ground powder from grinding media was examined using a media agitating wet mill.The effect of grinding condition was investigated on the contamination content and specific surface area of ground powders.Four sample powders were used;the two were CaCO_3 and SiO_2 which have lower Vickers hardness than grinding media i.e.,ZrO_2.The other two were AL_2O_3 and SiC which have higher Vickers hardness than zirconia.The followings are the results obtained.(1) The specific surface area of ground powders and the zirconia contamination content increased with increasing impeller velocity and with decreasing sample weight in the mill.At high impeller velocity and in low sample weight,the XRD profiles of ground Al_2O_3 contaminated with zirconia revealed the broad peaks for zirconia.(2) The contamination content significantly depended on the Vickers hardness of the sample powders.When the Vickers hardness of the sample powder was higher than that of the grinding media,the contamination content in the ground powder became very high.On the contrary,the contamination content in the ground powder with lower Vickers hardness was less than 1.0 wt.%.(3) The ratio of dipole moment to molecular volume of grinding solvent,μ/V influenced the contamination content and the specific surface area in the ground powder.The specific surface area increased,but the contamination content did not alway increase with an increase in μ/V.
社団法人日本材料学会の論文
1993-11-15

媒体かく拌ミルによる湿式粉砕における媒体の摩耗について

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