| 摘要: |
| 采用热扩散的方法在高温合金K417G基体上制备了NiCrAlY涂层，经测定，涂层以β–NiAl 相为主，Cr以固溶态和AlCr(x)相同时存在。1 000和1 100 ℃恒温氧化试验表明，NiCrAlY涂层显著提高了合金的抗氧化性，氧化膜致密稳定的Al2O3为主，300 h后氧化膜没有明显的剥落。对基体合金和涂层试样进行了900 ℃，NaCl/Na2SO4（25:75）融盐环境的热腐蚀试验。结果表明，NiCrAlY涂层氧化膜完整，涂层内硫化物含量低，有效提高了抗热腐蚀性能。 |
| 关键词: NiCrAlY涂层 热扩散法 氧化 热腐蚀 |
| DOI： |
| 分类号: |
| 基金项目: |
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| Oxidation and Hot Corrosion Behavior of NiCrAlY Coating Prepared by a Diffusion Method |
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LU Jin–tao, ZHU Sheng–long, WANG Fu–hui
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State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Science, Shenyang 110016
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| Abstract: |
| NiCrAlY coatings were prepared on a Ni–based superalloy K417G through a diffusion method. The main phase of the coating was β–NiAl, solid–soluted Cr and AlCr(x) coexisted in the coating. The isothermal oxidation behavior of the cast alloy and the coatings at 1 000 and 1 100 ℃were studied. The results show that NiCrAlY coatings have excellent oxidation resistance with low oxide growth rates, and thin oxide scales formed on the surfaces are adherent and protective. During the hot corrosion test at 900 ℃ in a NaCl/Na2SO4 (25:75) environment, the Al2O3 scale grown on the coating was integrated and no serious sulfuration was observed. |
| Key words: NiCrAlY coating hot diffusion method oxidation hot corrosion |
