Liang Wu, Ge Yang, Yang Xu, Yifeng Xiao, Xi Li, Yanfei Xu, Jinwen Qian, Yan Ou, Minghua Zhang, Qiankun Zhang, Yuehui He
October 4, 2019
The oxidation behavior of porous Ni-16Cr-9Al alloys at 800 and 1 000 °C was studied using the isothermal temperature oxidation method. The differences in surface morphology, phase and pore structure between oxidized and non-oxidized materials were characterized by means of scanning electron microscopy, X-ray diffraction analysis and mercury intrusion porosimetry. The results revealed that the oxidation rate of the samples which were oxidized for 420 h at 800 °C was 0.012% 2 h −1 and the oxidation products were Al 2 O 3 and Cr 2 O 3 . The oxidation rate of the samples which were oxidized for 390 h at 1 000 °C was 0.415% 2 h −1 and the oxidation products were Al 2 O 3 , Cr 2 O 3 and Ni(Cr, Al) 2 O 4 . All the oxidation kinetics curves obeyed the parabolic law, exhibiting excellent high temperature oxidation resistance.