Effect of Parameters on Dispersity of Rare Earth Bearing Polishing Slurry
Received:August 16, 2012  Revised:August 16, 2012
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KeyWord:polishing slurry; parameters; dispersing agent; pH value; stirring speed; property
SHU Shuo 内蒙古科技大学材料与冶金学院
LI Mei 内蒙古科技大学材料与冶金学院
Liu Zhao-gang 内蒙古科技大学材料与冶金学院
HU Yan-hong 内蒙古科技大学材料与冶金学院
WANG Mi-tang 内蒙古科技大学材料与冶金学院
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      Polishing slurry was prepared from BYK180 dispersing agent and rare earth bearing polishing powder. The effect of parameters including dosage of BYK180, pH value, stirring speed and time on dispersity of the polishing slurry was studied with the assistance of indexes of absorbance and sediment volume. The results show that with the increase of BYK180 dosage, stirring speed and time, the dispersity of the polishing slurry rises at first and then declines. pH value of 6.8 is the isoelectric point of the polishing slurry. Within a certain range of pH value, the farther deviation from the isoelectric point is, the larger absorbance of the polishing slurry is obtained, and the absorbance in basic system is slightly stronger than that in acid system. The absorbance starts to decline when the acidity or basicity of the polishing slurry is extremely strong. The optimal parameters for the dispersity of the polishing slurry include BYK180 dosage of 0.75%, pH value of 9.5, stirring speed of 2 000 r/min and stirring time of 120 min.