Effect of milling time on the particle size distribution and morphology of tungsten powders
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摘要: 通过改变球磨时间，获得不同粒度分布的钨粉颗粒，分析球磨时间对钨粉粒度分布和形貌特征的影响，提高粒度分布在目标区间（5～11 μm）的钨粉颗粒体积分数。结果表明，球磨的前2 h对原料中大颗粒钨粉的影响较大，钨粉颗粒最大粒径由134 μm迅速下降到20 μm左右。随着球磨时间的增加，钨粉粒度分布指标减缓下降，除粒径变小外，颗粒形貌基本无变化，但是在球磨10 h后开始出现团聚现象。综合分析可知，球磨时间的改变对钨粉粒度分布指标影响较大，球磨时间为8 h时，可获得粒度分布最窄的钨粉颗粒，在目标区间的钨粉颗粒体积分数达到75%。Abstract: The tungsten particles in the different particle size distribution were obtained by changing the ball milling time to increase the volume fraction of tungsten particles in the objective particle size distribution of 5~11 μm, and the influence of ball milling time on the particle size distribution and morphology of tungsten powders was analyzed. The results show that, the tungsten particle size decreases significantly in the initial ball milling for 2 h, and the maximum particle size decreases rapidly from 134 μm to about 20 μm. With the further increase of milling time, the typical particle size distribution parameters of tungsten powders decrease slowly. The morphology of tungsten powders does not change except the decrease of particle size. The agglomeration phenomenon appears after milling for 10 h. Comprehensive analysis shows that, the change of ball milling time has a great influence on the particle size distribution of tungsten powders. When the ball milling time is 8 h, the narrowest particle size distribution of tungsten powders is obtained, and the volume fraction of the tungsten particles in the objective particle size distribution reaches 75%.
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Keywords:
- milling time /
- tungsten powder /
- particle size distribution /
- morphology
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图 2 经不同时间球磨制备的钨粉粒度分布
Figure 2. Particle size distribution of the tungsten powders prepared by ball milling in the different milling time
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图 3 不同球磨时间钨粉最大粒径变化
Figure 3. Maximum particle size of the tungsten powders in the different ball milling time
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图 4 不同球磨时间钨粉粒度分布指标：（a）D10；（b）D50；（c）D90；（d）Dδ
Figure 4. Particle size distribution index of the tungsten powders in the different ball milling time: (a) D10; (b) D50; (c) D90; (d) Dδ
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图 5 球磨时间对钨粉形貌的影响：（a）2 h；（b）4 h；（c）6 h；（d）8 h；（e）10 h；（f）12 h
Figure 5. Effect of the ball milling time on the morphology of the tungsten powders: (a) 2 h; (b) 4 h; (c) 6 h; (d) 8 h; (e) 10 h; (f) 12 h
表 1 钨粉原料粒度
Table 1 Particle size of the raw tungsten powders
μm D10 D50 D90 Dδ Dmin Dmax 5.96 11.84 22.36 1.39 2.21 133.75 注：Dδ为粒度分布宽度[15]，Dδ=(D90−D10)/D50。 
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表 2 球磨实验参数
Table 2 Experimental parameters of the ball milling
球、料、水质量比 转速 / (r·min−1) 时间 / h 6.0:5.0:2.4 300 2、4、6、8、10、12
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表 3 经不同时间球磨制备的钨粉在目标区间（5～11 μm）的体积分数
Table 3 Volume fraction of the tungsten particles prepared by ball milling for the different milling time in the objective particle size distribution (5~11 μm)
球磨时间 / h 体积分数 / % 0 44.3 2 62.3 4 65.5 6 70.9 8 74.8 10 74.3 12 73.1
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表 4 球磨0～2 h粒度分布指标变化率
Table 4 Changing rate of particle size distribution index milled for 0～2 h
(μm·h−1) D10 D50 D90 0.29 1.06 3.78
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表 5 球磨10～12 h粒度分布指标变化率
Table 5 Changing rate of particle size distribution index milled for 10～12 h
(μm·h−1) D10 D50 D90 0.39 0.52 0.67
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表 6 球磨时间对钨粉颗粒比表面积的影响
Table 6 Effect of the ball milling time on the specific surface area of the tungsten powders
时间 / h 比表面积 / (cm2·g−1) 磨后比表面积:未磨比表面积 0 563.1 1.00 2 685.4 1.22 4 718.9 1.28 6 758.0 1.35 8 827.7 1.47 10 809.0 1.44 12 913.7 1.62
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