摘要
为了改善K403镍基高温合金的高温抗氧化性能,采用大气等离子喷涂在镍基合金表面制备了4种不同结构的MoSi2复合涂层。结果表明:4种结构涂层中K403/NiCoCrAlY/ZrO2/30%(体积分数)ZrO2-MoSi2/MoSi2复合涂层的抗热震性能最好,且该涂层的界面结合强度最高(22.5 MPa)。MoSi2涂层的自身结合强度大于涂层界面结合强度,结合机理以机械咬合式为主。该复合涂层在1 200℃氧化120 h后的质量增加仅为3.42 mg/cm2,提高K403合金和传统氧化锆涂层的抗氧化性能。MoSi2复合涂层表面在高温时生成了一层致密的SiO2保护膜,阻碍了氧的扩散,减轻了过渡层NiCoCrAlY/ZrO2界面处的氧化。
In order to improve the oxidation resistance of nickel-based alloy at high temperature, four kinds of MoSi2 composite coatings were successfully prepared on the nickel-based alloys surface by air plasma spraying. The results indicate that the thermal shock resistance and the adhesion strength （22.5 MPa） of K403/NiCoCrA1Y/ZrO2/30%（volume fraction）ZrOE-MoSi2/MoSi2 composites coating are the best among the four kinds of coatings. The self-bonding strength of MoSi2 coating is greater than the interracial bond strength of the composites coating, and the bond mechanism is mechanical bond with bite combination. The mass increment is only 3.42 mg/cm2 when MoSi2 composites coating is oxidized at 1 200 ℃ for 120 h. Compared with the nickle-based alloy and the conventional thermal barrier coating, the oxidation resistance of the MoSi2 composites coating is improved. During the high-temperature oxidation process, a dense SiO2 layer is formed on the surface of the MoSi2 coating, which hinder the diffusion of oxygen. The oxidation degree of the boundary between the NiCoCrAlY and zirconia ceramic is relieved.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2012年第10期2839-2845,共7页
The Chinese Journal of Nonferrous Metals
基金
湖南省自然科学基金资助项目(11JJ3063
12JJ9011)
湖南省教育厅科研项目(11B047
11C0513)
江苏省新型环保重点实验室开放课题基金资助项目(AE201108)
关键词
镍基合金
二硅化钼
复合涂层
组织
性能
nickel-based alloy
molybdenum disilicide
composites coating
microstructure
properties
