| Oxidation Resistance Coatings of Ir – Zr and Ir by Double Glow Plasma |
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| 作者姓名： | Z. Chen W. Wu and X. Cong |
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| 基金项目： | This work was supported by the National Natural Science Foundation of China （No. 50872055/E020703）, the Fundamental Research Funds for the Central Universities, the Funding for Outstanding Doctoral Dissertation in NUAA （No. BCXJ11-09） and the Funding of Jiangsu Innovation Program for Graduate Education （No. CXLX11 0207）. The authors acknowledge F.E. Boafo for refining the language. |
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| 摘 要： | Oxidation resistance coatings of Ir-40 at.% Zr and Ir were produced onto Mo substrates by double glow plasma technology. The oxidation resistances of the coatings were evaluated at high temperature. Ir-Zr coating consisted of two layers： the primary layer close to the substrate was composed of dense columnar grains and the second layer was composed of dense grains of nanometric size. The mass gain of Ir coating above 800℃ was about 1.35% due to the formation of solid IrO2. The mass loss of Ir coating was about 5.3% due to the formation of gaseous oxide IrO3 when being held at 1227 ℃ for 30 min. The substrate was protected more effectively by multilayer than monolayer coating of Ir in oxidizing environment. The Ir-Zr coating was well bonded to the substrate after oxidation at 800℃. After oxidation at 1000℃, the Ir-Zr coating was poorly bonded to the substrate. The oxidation resistance of Ir-Zr coating was poor due to high content of Zr.
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| 关 键 词： | 氧化涂层 铱涂层 辉光离子 质量损失 抗氧化涂料 抗氧化性能 离子技术 双层辉光 |
| 收稿时间： | 27 July 2012 |
Oxidation Resistance Coatings of Ir-Zr and Ir by Double Glow Plasma |
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| Z. Chen,W. Wu and X. Cong.Oxidation Resistance Coatings of Ir-Zr and Ir by Double Glow Plasma[J].Journal of Materials Science & Technology,2014,30(3):268-274. |
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| Authors: | Zhaofeng Chen Wangping Wu Xiangna Cong |
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| Affiliation: | College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China |
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| Abstract: | Oxidation resistance coatings of Ire40 at.% Zr and Ir were produced onto Mo substrates by double glow plasma technology. The oxidation resistances of the coatings were evaluated at high temperature. Ire Zr coating consisted of two layers: the primary layer close to the substrate was composed of dense columnar grains and the second layer was composed of dense grains of nanometric size. The mass gain of Ir coating above 800 C was about 1.35% due to the formation of solid IrO2. The mass loss of Ir coating was about 5.3% due to the formation of gaseous oxide IrO3when being held at 1227 C for 30 min. The substrate was protected more effectively by multilayer than monolayer coating of Ir in oxidizing environment. The Ire Zr coating was well bonded to the substrate after oxidation at 800 C. After oxidation at 1000 C, the Ire Zr coating was poorly bonded to the substrate. The oxidation resistance of Ire Zr coating was poor due to high content of Zr. |
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| Keywords: | Coating Oxidation resistance Double glow discharge |
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