用SEM\XRD和EPMA等手段，研究了溅射NiCrAlY涂层渗Al前后在1000℃和1100℃的高温氧化行为。结果表明，溅射涂层在1000℃形成了单相的α－Al2O3而具有优异的抗氧化性能；但在1100℃由于Al的过度消耗而失去保护作用。渗铝涂层在1000℃快速增长θ－Al2O3相，使其抗氧化性能稍逊于溅射涂层；在1100℃表面形成了以α－Al2O3为主的保护膜，抗氧化性能优于溅射涂层。
A nanocrystalline Ni-30Cr-8Al-0.5Y coating was deposited on a Ni-base superalloy by magnetron sputtering. Post-aluminizing was performed on the sputtered coating to improve the corresponding high-temperature oxidation resistance. The isothermal oxidation behaviors of the sputtered coating with and without aluminizing at 1000℃-1100℃ have been investigated using TGA, SEM/EDS, XRD and EPMA, respectively. The results indicated that the sputtered NiCrAlY coating possessed excellent oxidation resistance at 1000℃. Because of the excessive consumption of Al in the coating, it lost protective ability at 1100℃. The mass gain of the aluminized NiCrAlY coating was a little higher than that of the sputtered coating due to the formation of the rapid growthθ－Al2O3 phase at 1000℃. At 1100℃ the oxidation resistance of the latter was better than that of the former as a result of the formation of a continuous and protective Al2O3 scale.
参考文献
| [1] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%