Ball milling mixing progress for preparation of polycrystalline cubic boron nitride composites
XIE Hui1, DENG Fuming1, WANG Hao1, HAN Shunli2, FENG Fei3
1. School of Mechanical Electronic & Information Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China; 2. Besco Superabrasives Co., Ltd., Kaifeng 475000, China; 3. Henan Huanghe Whirlwind Co., Ltd., Changge 461500, China
Abstract：The operation law of ball mill and the mechanism of ball milling process were studied. The cubic boron nitride powders with different particle sizes were milled, and the particle size distribution and grain refinement rate before and after ball milling were analyzed by laser particle size analyzer. SEM and XRD were used to observe and analyze the powder and sintered samples to study the effect of ball milling process on the preparation of cubic boron nitride polycrystalline materials. The results show that, the horizontal planetary ball mill used for mixing process has a suitable rotation speed range. In this range, the higher the rotating speed is, the stronger the impact and grinding effect the ball will bear. The finer particles tend to agglomerate during ball milling, but the coarser the powder particles are, the higher the refining rate is. The coarse and fine mixed particles appear doping after mixing for 4 h. The longer the milling time, the higher the mixing uniformity and the more doping. The higher the rotating speed, the more significant the doping. The higher the rotation speed, the more significant the ball milling powder doping. The best wet milling mixing process of 2-8 μm fine powder is ball milling at 180 r/min for 12 h.
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2020, Vol. 25 
