Effect of jet milling processing on microstructure and mechanical properties of the sintered tungsten powders
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摘要: 采用气流磨分级技术对商业钨粉进行改性，研究气流磨处理和不同粒度搭配对钨粉粉末烧结体微观组织和力学性能的影响。结果表明，经气流磨分级处理后，粒度分布较窄的钨粉能实现良好的堆积均匀性，消除团聚体在烧结过程中形成的不规则粗孔，提升粉末烧结均匀性，提高烧结后期整体相对密度；烧结相对密度由90.7%提高至92.8%，抗弯强度由238.5 MPa提升至292.4 MPa。获得粒度分布窄、分散性好的钨粉可以消除烧结体中不规则粗孔，是提升烧结体力学性能的关键。Abstract: Commercial tungsten powders were modified by jet milling, the effects of jet milling treatment and particle size distribution on the microstructure and mechanical properties of the sintered tungsten body were studied. The results show that, the tungsten powders treated by jet milling in the narrower particle size distribution can achieve the better packing homogeneity, eliminate the irregular coarse pores formed during sintering, improve the sintering uniformity, and increase the relative density of the sintered body; the relative density of the sintered body increases from 90.7% to 92.8%, and the bending strength from 238.5 MPa to 292.4 MPa. The tungsten powders in the narrow particle size distribution with the good dispersibility can eliminate the irregular coarse pores in sintered body, which is the key factor to improve the mechanical properties of the sintered body.
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Key words:
- jet milling /
- tungsten powders /
- sintering /
- pores /
- microstructure /
- mechanical properties
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图 1 对喷式气流磨工作原理示意图
Figure 1. Schematic diagram of the fluidized bed opposed jet milling
图 2 气流磨处理前后的粉末形貌：（a）原粉W0；（b）气流磨W1；（c）气流磨W2；（d）气流磨W3
Figure 2. Powder morphology before and after jet milling: (a) W0 raw powders; (b) W1 jet milled powders; (c) W2 jet milled powders; (d) W3 jet milled powders
图 4 气流磨处理前后粉末的X射线衍射图谱（a）和Williamson-Hall公式拟合曲线（b）
Figure 4. XRD patterns (a) and the fitted curves of Williamson-Hall equation (b) for the powders before and after jet milling
图 5 不同批次粉末烧结后的孔隙结构：（a）（e）原粉W0；（b）（f）气流磨W1；（c）（g）气流磨W2；（d）（h）气流磨W3
Figure 5. Pore structure of the different sintered samples: (a) (e) W0; (b) (f) W1; (c)(g) W2; (d) (h) W3
图 6 不同批次粉末烧结后的孔隙孔径和长径比分布：（a）原粉W0；（b）气流磨W1；（c）气流磨W2；（d）气流磨W3
Figure 6. Pore size and the aspect ratio of the different sintered samples: (a) W0; (b) W1; (c) W2; (d) W3
图 7 不同批次粉末烧结试样的抗弯实验载荷–位移曲线
Figure 7. Load–displacement curves of the different sintered samples in the bending experiments
表 1 不同批次粉末的粒度分布参数
Table 1. Particle size distribution parameters of the different powders
批次 D10 / μm D50 / μm D90 / μm 比表面积 / (m2·kg−1) 原粉W0 5.95 12.57 23.03 187.2 气流磨W1 5.30 8.02 11.79 259.5 气流磨W2 5.49 8.91 15.72 231.6 气流磨W3 2.99 7.14 11.53 348.7 
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表 2 不同批次粉末的烧结后性能参数
Table 2. Properties parameters of the different sintered samples
批次 相对密度 / % 平均晶粒尺寸 / μm 抗弯强度 / MPa 原粉W0 90.7 10.5 238.5±21.3 气流磨W1 92.8 10.1 292.4±10.5 气流磨W2 92.6 10.3 263.1±14.6 气流磨W3 92.3 10.4 248.3±15.1
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