Preparation of spherical FeSiCr powders by improved combination atomization process
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摘要:
对常规组合雾化冶炼工艺进行改进和优化，通过增强一次雾化阶段的效果和延长液滴球化时间改善粉末形貌。采用改进型组合雾化工艺制备出不同粒径的球形粉末样品，并与常规组合雾化产出的粉末进行对比分析。研究表明，改进型组合雾化工艺产出的粉末具有形貌好、比表面积小、氧含量低的特点；改进型组合雾化粉末磁导率低于常规组合雾化粉末，但磁粉芯的直流偏置能力显著改善，磁滞损耗以及涡流损耗明显降低。
Abstract:The conventional combined atomization smelting process was improved and optimized in this paper, the powder morphology was improved by enhancing the effect of the primary atomization stage and prolonging the time of droplet spheroidization. Spherical powders with different particle sizes were prepared by the improved combination atomization process and compared with those prepared by the conventional combination atomization. The results show that the powders prepared by the improved atomization process show the characteristics as good morphology, small specific surface area, and low oxygen content. At the same time, the permeability is lower than that of the conventional atomized powders, but the DC bias ability of magnetic core is significantly improved, and the hysteresis loss and eddy current loss are significantly reduced.
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Keywords:
- atomization process /
- specific surface area /
- oxygen content /
- magnetic energy /
- core losses
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图 2 FeSiCr粉末形貌：（a）D50=10 μm（改进型）；（b）D50=25 μm（改进型）；（c）D50=10 μm（常规）；（d）D50=25 μm（常规）
Figure 2. Morphology of the FeSiCr powders: (a) D50=10 μm (improved); (b) D50=25 μm (improved); (c) D50=10 μm (conventional); (d) D50=25 μm (conventional)
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图 3 比表面积随粒度变化曲线
Figure 3. Relationship between the specific surface area and grain size
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图 5 FeSiCr磁粉的磁滞回线：（a）磁滞回线；（b）局部放大图
Figure 5. Hysteresis loops of the FeSiCr magnetic powders: (a) hysteresis loop; (b) partial magnification
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图 6 FeSiCr磁粉芯磁导率随频率及粒度变化曲线
Figure 6. Magnetic permeability in the core of the FeSiCr alloy powders with frequency and particle size
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图 7 FeSiCr磁粉芯直流偏置能力随直流磁场及粒度变化曲线
Figure 7. DC bias properties in the core of the FeSiCr alloy powders with magnetic field and particle size
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图 8 FeSiCr粉心损耗随粒度变化曲线：（a）磁滞损耗；（b）涡流损耗
Figure 8. Core losses of the FeSiCr alloy powders with the frequency and particle size: (a) hysteresis loss; (b) eddy current loss
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图 9 磁粉芯损耗随磁场强度及粒度变化曲线：（a）50 kHz；（b）100 kHz
Figure 9. Curves of the magnetic core loss with magnetic field intensity and particle size: (a) 50 kHz; (b) 100 kHz
表 1 FeSi3.5Cr4.5粉末样品物理指标
Table 1 Physical properties of the FeSi3.5Cr4.5 powder samples
序号 制备工艺 筛网 D10 / μm D50 / μm D90 / μm 氧含量（质量分数） / ×10‒6 振实密度 / (g·cm‒3) 1# 常规 500目 2.47 6.05 12.87 3054 4.00 2# 常规 400目 3.60 10.59 24.56 2258 4.16 3# 常规 325目 4.15 14.09 42.67 1948 4.31 4# 改进型 500目 4.48 10.23 19.98 1314 4.67 5# 改进型 450目 6.41 13.93 22.81 864 4.76 6# 改进型 250目 8.95 25.90 42.53 600 4.90 
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