| 摘要: |
| 利用双辉等离子渗金属技术，在工业纯铁电极材料表面进行正交渗钼试验，用极差分析方法研究了极间距、温度、时间、源极电压和气压对合金渗层厚度的影响，并对渗钼的工艺参数进行优化。采用光学显微镜、X射线衍射仪（XRD）、显微硬度仪、扫描电镜（SEM）和能谱仪观察合金渗层的金相组织及厚度，测定合金渗层的物相组成和渗层硬度，检测合金渗层的形貌、元素分布。结果表明：渗钼工艺优化参数为源极电压800～850 V，保温温度1 020 ℃，保温时间4 h，工作气压35 Pa，极间距20 mm，可获得满足试验要求的80 μm的合金渗层；合金渗层组织为柱状晶，Mo元素在合金渗层中呈梯度分布，合金渗层的物相为Fe（Mo）固溶体和Mo相，合金渗层的硬度呈下降趋势，渗钼后试样的表面硬度为248.5 HV0.05。 |
| 关键词: 等离子 渗钼合金层 电极材料 |
| DOI：10.3969/j.issn.1007-9289.2014.02.014 |
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| 基金项目: |
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| Process of Pure Iron Electrode Material with Plasma Surface Molybdenizing |
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WU Weiqin, GAO Yuan, ZHANG Yan, WANG Chenglei
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School of Materials Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, Guangxi
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| Abstract: |
| Alloy layers containing Mo were obtained by double glow plasma surface alloying technology on industrial pure iron with orthogonal test, and the effects of space between the electrodes, holding temperature, holding time, source voltage and gas pressure on the thickness of the alloyed layer were investigated and optimized by the range analysis method. The microstructure,thickness, phase structure, surface morphology, hardness and distribution of element were characterized by optical microscope, Xray diffraction, microhardness analyzer, and scanning electron microscope with energy dispersive Xray spectroscopy. The results show that the alloy layer with a thickness of 80 μm can be obtained by using the optimal processing parameters: source voltage 800850 V, holding temperature 1 020 ℃, holding time 4 h, gas pressure 35 Pa, and space between the electrodes 20 mm. The organizations of the alloyed layer are columnar crystals with Mo gradient distribution in the alloyed layer, the phase structure alloyed layer is Fe(Mo) solid solution and Mo phase, the hardness of the alloyed layer trends downward, and the surface hardness of the sample is 248.5 HV0.05. |
| Key words: plasma Moalloyed layer electrode material |
