CAJ | 학술논문

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Al_2O_3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/Na_2SO_4(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.
채용열확산적방법재고온합금K417G기체상제비료NiCrAlY도층,경측정,도층이β-NiAl 상위주,Cr이고용태화AlCr_(x)상동시존재.1 000화1 100 ℃항온양화시험표명,NiCrAlY도층현저제고료합금적항양화성,양화막치밀은정적Al_2O_3위주,300 h후양화막몰유명현적박락.대기체합금화도층시양진행료900 ℃,NaCl/Na_2SO_4(25:75)융염배경적열부식시험.결과표명,NiCrAlY도층양화막완정,도층내류화물함량저,유효제고료항열부식성능.
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/Na_2SO_4 (25:75) environment, the Al_2O_3 scale grown on the coating was integrated and no serious sulfuration was observed.