| Growing kinetics and structural characterization of oxide film formed on La-doped Co-40Cr alloy |
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| 作者姓名： | Hui Ming Jin Adriana Felix Majorri Aroyave |
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| 作者单位： | Hui Ming Jin a，Adriana Felix b，Majorri Aroyave b a College of Mechanical Engineering，Yangzhou University，Yangzhou 225009，China b College of Materials Engineering，National University of Antioquia，Medelin 23715，Colombia Received 13 November 2006 |
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| 基金项目： | 国家自然科学基金;国家自然科学基金 |
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| 摘 要： | The isothermal and cyclic oxidizing kinetics of Co-40Cr alloy and its lanthanum ion-implanted samples were studied at 1000℃ in air by thermal-gravity analysis (TGA). Scanning electronic microscopy (SEM) and transmission electronic microscopy (TEM)) were used to examine the oxidized film's morphology and the structure after oxidation. Secondary ion mass spectrum (SIMS) method was used to examine the binding energy change of chromium caused by La-doping and its in?uence on formation of Cr2O3 film. Laser Raman spectrum was used to examine the tress changes within oxidized films. It was found that lanthanum implantation remarkably reduced the isothermal oxidizing rate of Co-40Cr and improved the anti-cracking and anti-spalling properties of Cr2O3 film. The reasons were that the implanted lanthanum reduced the grain size and internal stress of Cr2O3 oxide, increased the high temperature plasticity of oxidized film. Lanthanum mainly existed in the outer surface of Cr2O3 film in the forms of fine La2O3 and LaCrO3 spinel particles.
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| 关 键 词： | 掺镧 钴铬合金 氧化膜 生长动力学 结构特征 |
| 收稿时间： | 2006-11-13 |
Growing kinetics and structural characterization of oxide film formed on La-doped Co-40Cr alloy |
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| Hui Ming Jin Adriana Felix Majorri Aroyave.Growing kinetics and structural characterization of oxide film formed on La-doped Co-40Cr alloy[J].Chinese Chemical Letters,2007,18(5):577-580. |
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| Authors: | Hui Ming Jin Adriana Felix Majorri Aroyave |
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| Institution: | 1. College of Mechanical Engineering, Yangzhou University, Yangzhou 225009, China;2. College of Materials Engineering, National University of Antioquia, Medelin 23715, Colombia |
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| Abstract: | The isothermal and cyclic oxidizing kinetics of Co–40Cr alloy and its lanthanum ion-implanted samples were studied at 1000 °C in air by thermal-gravity analysis (TGA). Scanning electronic microscopy (SEM) and transmission electronic microscopy (TEM)) were used to examine the oxidized film's morphology and the structure after oxidation. Secondary ion mass spectrum (SIMS) method was used to examine the binding energy change of chromium caused by La-doping and its influence on formation of Cr2O3 film. Laser Raman spectrum was used to examine the tress changes within oxidized films. It was found that lanthanum implantation remarkably reduced the isothermal oxidizing rate of Co–40Cr and improved the anti-cracking and anti-spalling properties of Cr2O3 film. The reasons were that the implanted lanthanum reduced the grain size and internal stress of Cr2O3 oxide, increased the high temperature plasticity of oxidized film. Lanthanum mainly existed in the outer surface of Cr2O3 film in the forms of fine La2O3 and LaCrO3 spinel particles. |
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| Keywords: | Oxidation Doping Raman spectrum SIMS Lanthanum |
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