Effect of oxidation time on microstructure and electromagnetic properties of FeSiAl alloy powders
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摘要:
以FeSiA合金粉末为原料，研究空气中500 ℃下不同氧化时间对FeSiAl合金粉末微观组织和电磁性能的影响。结果表明：随着氧化时间的延长，FeSiAl合金粉末颜色由深灰色向土黄色转变，表面微观形貌无明显改变。氧化5 h后，粉末表面出现Fe3O4，随着氧化时间进一步增加至10 h，Fe3O4逐渐转变为Fe2O3。FeSiAl合金粉末表面氧化层主要包含Fe2O3、SiO2和Al2O3。粉末介电常数和磁导率的实部随着氧化时间的增加呈上升趋势，介电常数的虚部和磁导率虚部无明显变化。
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关键词:
- FeSiAl合金粉末 /
- 氧化时间 /
- 微观组织 /
- 电磁性能
Abstract:The effect of oxidation time on the microstructure and electromagnetic properties of the FeSiAl alloy powders was investigated at 500 ℃ in air, using FeSiAl alloy powders as the raw materials. The results show that, the surface color of the FeSiAl alloy powders changes from gray to yellow with the increase of oxidation time, and there is no significant change of the surface microstructure. After the oxidation time reaches 5 h, Fe3O4 can be found and gradually transforms into Fe2O3 as the oxidation time up to 10 h. The surface oxide layer of the FeSiAl alloy powders is mainly composed of Fe2O3, SiO2, and Al2O3. The real part of the permittivity and permeability of the powders show an upward trend with the oxidation time increasing, and there is no obvious change in the imaginary part of the permittivity and permeability.
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Keywords:
- FeSiAl alloy powders /
- oxidation time /
- microstructure /
- electromagnetic properties
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图 2 空气中500 ℃下不同氧化时间FeSiAl粉末表面显微形貌：（a）原样；（b）1 h；（c）5 h；（d）10 h；（e）24 h
Figure 2. SEM images of the FeSiAl alloy powders oxidized for the different time at 500 ℃ in air: (a) as-received sample; (b) 1 h; (c) 5 h; (d) 10 h; (e) 24 h
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图 3 空气中500 ℃下不同氧化时间FeSiAl合金粉末X射线衍射谱图
Figure 3. XRD patterns of the FeSiAl alloy powders oxidized for the different time at 500 ℃ in air
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图 4 空气中500 ℃氧化不同时间FeSiAl合金粉末表面O1s高分辨能谱分析：（a）原样表面全谱；（b）原样；（c）1 h；（d）5 h；（e）10 h；（f）24 h
Figure 4. High-resolution O1s XPS spectra of the FeSiAl alloy powders oxidized for the different time at 500 ℃ in air: (a) survey spectra of the as-received sample; (b) as-received sample; (c) 1 h; (d) 5 h; (e) 10 h; (f) 24 h
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图 5 空气中500 ℃下氧化不同时间后FeSiAl合金粉末磁滞回线
Figure 5. Hysteresis loops of the FeSiAl alloy powders oxidized for the different time at 500 ℃ in air
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图 6 空气中500 ℃下氧化不同时间后FeSiAl合金电磁参数：（a）介电常数实部（ε′）；（b）介电常数虚部（ε″）；（c）磁导率实部（μ′）；（d）磁导率虚部（μ″）
Figure 6. Electromagnetic parameters of the FeSiAl alloy powders oxidized for the different time at 500 ℃ in air: (a) real part of complex permittivity (ε′); (b) imaginary part of complex permittivity (ε″); (c) real part of complex permeability (μ′); (d) imaginary part of complex permeability (μ″)
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