摘要
采用热扩散的方法 ,在K4 38高温合金表面制备了Al Si涂层。经 10 0 0℃× 5 0 0h高温氧化性能试验结果表明 ,K4 38镍基高温合金表面的涂层 ,在高温氧化过程中已转变成致密完整的α Al2 O3氧化层和富铝的 β NiAl和富镍的β NiAl化合物层 ,与基体金属的粘附性良好。Al Si涂层中Si元素的扩散和合理分布能有效的抑制β相的生长 ,延长涂层的退化速度 。
The Al-Si coating on the surface of K438 superalloy was prepared by diffusing at high temperature. The oxidation behavior of the coating at 1000°C for 500 h in air was investigated. It was found that the coating changed to the microstructure consisting of α-Al2O3, Ni-rich β-NiAl and Al-rich β-NiAl in the process of oxidation, and good adhesive strength of the coating with substrate can be expected. The reasonable profile of silicon in the coating played a significant role in delaying the degradation of β-phase, and made the coating to show better oxidation resistance at high temperature.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2004年第1期66-68,86,共3页
Transactions of Materials and Heat Treatment
关键词
高温合金
AL-SI涂层
高温氧化
Aluminum alloys
Diffusion coatings
High temperature effects
Interdiffusion (solids)
Microstructure
Silicon alloys
Superalloys
