吕艳红,张启富,吴子健.高能高速等离子喷涂NiCoCrAlY涂层抗燃气热腐蚀性能[J].表面技术,2016,45(9):126-133.
LYU Yan-hong,ZHANG Qi-fu,WU Zi-jian.High-temperature Gas Corrosion Resistance of NiCoCrAlY Coating Pre-pared by High-energy and High-speed Plasma-spraying[J].Surface Technology,2016,45(9):126-133 |
| 高能高速等离子喷涂NiCoCrAlY涂层抗燃气热腐蚀性能 |
| High-temperature Gas Corrosion Resistance of NiCoCrAlY Coating Pre-pared by High-energy and High-speed Plasma-spraying |
| 投稿时间：2016-03-27 修订日期：2016-09-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2016.09.020 |
| 中文关键词: 高能高速等离子喷涂 NiCoCrAlY涂层 IC6高温合金 结合强度 抗燃气热腐蚀 热腐蚀速率 |
| 英文关键词:high-energy and high-speed plasma-spraying NiCoCrAlY coating IC6 high temperature alloy adhesion strength high temperature gas corrosion resistance hot corrosion rate |
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| 中文摘要: |
| 目的 研究NiCoCrAlY涂层抗高温燃气热腐蚀性能。方法 采用高能高速等离子喷涂工艺在Ni3Al基高温合金IC6基体表面制备NiCoCrAlY涂层，测试了涂层与基体间的结合强度以及涂层和IC6基体在900 ℃高温环境下的抗燃气热腐蚀动力学曲线。并借助扫描电子显微镜和X射线衍射仪分析燃气热腐蚀试验前后涂层的显微组织和物相结构组成。结果 高能高速等离子喷涂工艺制备的NiCoCrAlY涂层致密性高，孔隙率≤3%；涂层与基体结合状态好，平均结合强度达到62 MPa；涂层中氧化物和夹杂含量少。经100 h燃气热腐蚀后，基体和涂层的腐蚀速率分别为8.09 g/(m2•h)和0.50 g/(m2•h)。结论 NiCoCrAlY涂层显著提高了IC6合金的抗燃气热腐蚀性能。涂层表面生成了以Al2O3和Cr2O3为主要成分的完整致密的氧化膜，Al2O3抗氧化性能好，Cr2O3抗腐蚀性能好，在两者共同作用下，腐蚀气氛向涂层内部的侵蚀被有效地阻挡或延缓；同时涂层内孔隙、氧化物夹杂等缺陷含量少，腐蚀气氛的扩散通道被阻隔或延长，降低了腐蚀速率，使得涂层对基体合金起到了很好的保护作用。 |
| 英文摘要: |
| Objective To study the high temperature gas corrosion resistance of NiCoCrAlY coating. Methods The NiCoCrAlY coating was prepared by high-energy and high-speed plasma-spraying technology on Ni3Al based alloy IC6. The adhesion strength and gas hot-corrosion kinetic curve of IC6 and coating at 900 ℃ were tested. The microstructure and phase composition of the coating before and after corrosion test were also analyzed by means of SEM and XRD. Results The NiCoCrAlY coating which was prepared by high-energy and high-speed plasma-spraying had high density with the porosity no more than 3%. The combination between coating and substrate was in good condition, of which the average adhesion strength reached 62 MPa, and the content of oxide and inclusion in the coating was little. The corrosion rate of the IC6 alloy and the coating was respectively 8.09 g/(m2•h) and 0.50 g/(m2•h) after 100 h' gas hot corrosion. Conclusion The gas hot-corrosion resistance of IC6 alloy has been increased significantly by applying NiCoCrAlY coating. The surface of coating has produced complete and compact oxide film, with Al2O3 and Cr2O3 as the main component. Al2O3 has good oxidation resistance and Cr2O3 has good corrosion resistance. Under the influence of both, the erosion of the corrosion atmosphere towards internal coating has been blocked and delayed. At the same time, because of the little defects such as pores and oxidation in the coating, the diffusing passageway of the corrosion atmosphere has been separated and the corrosion rate has been decreased, which has resulted in a good protection for IC6 alloy. |
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