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《Rare Metal Materials and Engineering》 2005-02
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Oxidation Behaviors of New Ni-based Superalloy at 950℃and 1000℃

Zhao Shuangqun1,2, Dong Jianxin1, Zhang Maicang1, Xie Xishan1 (1. University of Science and Technology Beijing, Beijing 100083, China) (2. Ningxia University, Yinchuan 750021, China)  
A new nickel-based superalloy was oxidized in air at 950oC and 1000oC for time up to 140 h. Its oxidation behaviors were investigated by means of TGA, XRD and SEM(EDX). The kinetic curve of alloy oxidized at 950℃ for 128 h obeys the parabolic rate law and no oxide peels off. The parabolic law is almost followed when alloy is oxidized at 1 000℃. A small amount of oxide scale spallation happens in the course of oxidation at 1 000℃. The oxide scales consist of Cr2O3, (Ni,Co)Cr2O4, TiO2, SiO2 and Al2O3, and internal oxidation takes place both at 950℃ and at 1 000℃. This new alloy exhibits higher resistance to oxidation at 950℃ than that at 1 000℃. The oxidation mechanism of the alloy has also been suggested by the phase composition analyses of oxide layers.
【CateGory Index】: TG172.8
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