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本文在球料比为1.5︰1的情况下对40型和200型WC块进行球磨,研究了球磨时间对球磨后WC粉的化学成分、粒度及粒度分布、亚晶尺寸、形貌等的影响。然后,选取球磨1 h和16 h的WC粉为原料,在相同的工艺条件下制备成合金,观察了合金形貌,检测了合金磁力、密度、硬度等性能。结果表明:随着球磨时间的延长,WC粉的粒度和总碳量降低,氧含量增加,粒度分布发生明显变化:随着球磨时间的延长,粒度分布曲线的峰值不断向左(即粒度细的方向)快速移动;随着球磨时间的延长,首先是粘结的WC颗粒分离,然后多晶WC颗粒沿晶界面破裂,最后不规则的粗大WC晶粒发生穿晶断裂并产生大量的微细粉末;随着球磨时间的延长,晶粒内部的亚晶尺寸不断变小。40型WC块经过长时间球磨后,其制备的合金的矫顽磁力和抗弯强度都减少,而其它性能没有明显变化。200型WC块经过长时间球磨后,其制备的合金的矫顽磁力减少,而其它性能也没有明显变化。200型WC块长的球磨时间容易造成合金中WC晶粒不均匀长大。
In this paper, 40 and 200 WC blocks were ball-milled at a ball-to-material ratio of 1.5: 1, and the effects of ball milling time on the chemical composition, particle size, particle size distribution, subgrain size, . Then, the WC powders prepared by ball milling for 1 h and 16 h were selected as raw materials and alloyed under the same technological conditions. The morphology of the alloy was observed and the magnetic, density, hardness and other properties of the alloy were tested. The results show that with the increase of milling time, the particle size and total carbon content of WC powder decrease, and the oxygen content increases, the particle size distribution changes obviously. With the milling time prolonging, the peak value of particle size distribution curve continues to the left With the ball milling time is extended, the first is the bonded WC particles separated, and then the polycrystalline WC particles along the grain boundary rupture, and finally the irregular coarse WC grains transgranular fracture and produce a large number of fine powder; With the ball milling time, the grain size of the subgrain continues to diminish. 40 type WC block after milling for a long time, the alloy prepared by its coercivity and bending strength are reduced, while other properties did not change significantly. 200-type WC block after milling for a long time, the alloy prepared by its coercivity decreased, while other properties did not change significantly. 200-type WC block ball milling time is easy to cause uneven WC grain growth in the alloy.