Affiliation:
1. Shenyang National Laboratory for Materials Science, Northeastern University, Shenyang 110819, China
2. Nuclear Power Institute of China, Chengdu 528208, China
Abstract
Nanocrystalline coatings with the same chemical composition as an N5 superalloy were prepared on K38 and N5 superalloys by magnetron sputtering. The effect of different superalloys on the high temperature oxidation behavior of nanocrystalline coatings was investigated through oxidation kinetics, X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), and wavelength dispersive spectrometry (WDS). The results indicated that K38-N5 had better oxidation resistance than N5-N5 due to the diffusion of Zr from the K38 superalloy into the oxide scale. In addition, no interdiffusion occurred in the K38 superalloy. The formation of Ta-rich phases in the Al2O3 scale leads to decrease the oxidation resistance of nanocrystalline coatings. However, the presence of Zr inhibits the formation of Ta-rich phases.
Funder
National Natural Science Foundation of China
Fundamental Research Funds for the Central Universities
Ministry of Industry and Information Technology Project
Subject
Materials Chemistry,Surfaces, Coatings and Films,Surfaces and Interfaces