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| La元素对MoSi2涂层的宽温域氧化行为影响 |
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杨英1,2, 毛绍宝2,3, 巫业栋1,2,3, 张世宏1,2,3
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1.安徽工业大学 先进金属材料绿色制备与表面技术教育部重点实验室, 马鞍山 243002;2.安徽工业大学 现代表界 面工程研究中心, 马鞍山 243002;3.安徽工业大学 材料科学与工程学院, 马鞍山 243002
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| 摘要: |
| 采用包渗法在稀土 La2O3 掺杂钼合金基体上制备 MoSi2 涂层,并就 La 元素对 MoSi2 涂层宽温域氧化行为的影响机制进行了系统研究。 结果表明:钼镧合金基 MoSi2 涂层组织结构较为致密,主要物相为 MoSi2 相。 不同温度下 La 元素对 MoSi2 涂层的抗氧化性能的影响不同,1600 ℃高温静态氧化条件下,La 元素的存在促进了涂层与基体的化学反应,加剧了 MoSi2 抗氧化主体层的消耗速度,使得 MoSi2 涂层的高温抗氧化性能有所下降;800 ℃ 中温静态氧化条件下, La 元素对 MoSi2 涂层抗氧化性能影响不明显;500 ℃低温静态氧化条件下,La 元素的加入加速了涂层中 Si 元素的扩散, 使得涂层表面能较快形成一层致密的氧化层,“Pest”效应得到抑制,从而显著提升涂层的低温抗氧化性能。 |
| 关键词: La 元素 MoSi2 涂层 氧化行为 “Pest” 效应 |
| DOI：10.11933/j.issn.1007-9289.20190803001 |
| 分类号:TG146.4 |
| 文章编号:1007-9289(2020)03-0152-08 |
| 文献标识码:A |
| 基金项目:国家自然科学基金 (51671002)； 安徽省重点研究与开发计划项目(1804b06020370) |
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| Effects of La Element on Oxidation Behavior of MoSi2 Coatings in Wide Temperature Range |
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Yang Ying1,2, Mao Shaobao2,3, Wu Yedong1,2,3, Zhang Shihong1,2,3
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1.Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials, Ministry of Education, Anhui U- niversity of Technology, Maanshan 243002 , China;2.Research Center of Modern Surface and Interface Engineering, Anhui U- niversity of Technology, Maanshan 243002 , China;3.School of Material Science and Engineering, Anhui University of Tech- nology, Maanshan 243002 , China
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| Abstract: |
| MoSi2 coatings were prepared on rare earth La2O3 doped molybdenum alloy substrates by pack cementation method. The effects of La element on the oxidation behavior of MoSi2 coatings in wide temperature range were studied systematically. The results show that the MoSi2 coating exhibits dense microstructure, which is mainly composed of MoSi2 phase. The effects of La el- ement on the oxidation resistance of MoSi2 coating are different at various temperatures. Under the static oxidation conditions at 1600 ℃ , the addition of La element promotes the chemical reactions between the coating and the substrate, and accelerates the consumption rate of MoSi2 , which leads to the decrease in the high temperature oxidation resistance of the coating. Meanwhile, La element has little influence on the oxidation resistance of the coating at 800 ℃. Under the static oxidation conditions at 500 ℃, La element increases the diffusion rate of Si element in the coating, which favors the formation of a dense oxide layer on the coat- ing surface, and " Pest" effect is inhibited effectively. Therefore, the low temperature oxidation resistance of the coating is im- proved significantly. |
| Key words: La element MoSi2 coating oxidation behavior " Pest" effect |