摘要
采用磁控溅射方法在高Cr镍基单晶合金上沉积晶粒平均尺寸小于100 nm的Ni30Cr12Al0.3Y涂层,通过对镍基单晶合金及其Ni30Cr12Al0.3Y涂层在900℃的75%Na2SO4+25%K2SO4熔盐中的腐蚀动力学曲线测定及组织观察,研究了Ni30Cr12Al0.3Y涂层对高Cr镍基单晶合金热腐蚀行为的影响。结果表明,镍基单晶合金遭受了灾难性的热腐蚀,出现严重的内硫化和内氧化现象;而Ni30Cr12Al0.3Y涂层在热腐蚀过程中,仅涂层表面生成连续的Al2O3氧化膜,表现出优良的抗热腐蚀性能。
Ni30Crl2A10.3Y nanocrystalline coatings with mean grain size less than 100 nm were deposited on a single crystal Ni-base superalloy substrate by magnetron sputtering. By means of observation of the coating microstructure and measurement of the mass-change curves in hot corrosion, the hot corrosion behavior of the superalloy with and without Ni30Crl2A10. 3Y coatings in molten 75% Na2SO4 ＋ 25% K2SO4 at 900℃ was investigated . The results indicate that the superalloy suffered svere hot corrosion and serious internal oxidation and internal sulfidation. The NiCrAlY coating effectively protects the superalloy from hot corrosion and improves the hot corrosion resistance of the superalloy due to the formation of a continuous and dense Al2O3 film.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2013年第10期153-159,共7页
Transactions of Materials and Heat Treatment
基金
国家自然科学基金(50571070)
辽宁省教育厅资助项目(L2012063)
关键词
镍基单晶合金
磁控溅射
熔盐
热腐蚀
single crystal Ni-base superalloy
magnetron sputter
molten sulfate
hot corrosion
