Oxidation kinetics of cast Ni-base superalloy K35

被引：0

作者：

Li, Yun ^{[1
]}

Yuan, Chao ^{[2
]}

Guo, Jian-Ting ^{[2
]}

Yang, Hong-Cai ^{[1
]}

机构：

[1] Sch. of Mat. and Metall., Northeastern Univ., Shenyang 110004, China

[2] Inst. of Metal Res., Chinese Sci., Shenyang 110016, China

来源：

Dongbei Daxue Xuebao/Journal of Northeastern University | 2003年 / 24卷 / 01期

关键词：

Kinetic theory - Nickel - Oxidation;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

The oxidation kinetics and the oxidation layer of a cast Ni-base superalloy K35 at 800°C were studied by still TGA method. The results show that oxidation kinetics of the superalloy K35 obeys the parabolic law. The oxidation stage can be divided into two parts within 100 h: the oxidation rate are 2.50×10-7 mg2/cm4&middots in first stage and 2.05×10-7 mg2 /cm4 &middots in the other stage. Because the average oxidation velocity is 0.00263 mg/cm&middoth for 100 h, the oxidation resistance of the superalloy K35 is the first grade. It is suggested that oxidation rate of the superalloy K35 is dependent on the growth dynamics of Cr2O3. The oxide layer was examined by X-ray diffraction, scanning electron microscopy (SEM) and energy spectrum analysis (ESA). The layer is thin and consists of Cr2O3 mainly with a bit of NiCr2O4 and TiO&middotTiO2. During oxidation at 800°C, the inner oxidation occurs in the superalloy.

引用

页码：75 / 78