Activation Energy of Oxidation of Novel Co-Al-W Superalloys at High Temperatures

被引：0

作者：

Xu Yangtao ^{[1
,2
]}

Xia Tiandong ^{[2
]}

Zhao Wenjun ^{[2
]}

Wang Xiaojun ^{[2
]}

Yan Jianqiang ^{[2
]}

机构：

[1] Lanzhou Univ Technol, Sch Mat Sci & Engn, State Key Lab Gansu Adv Nonferrous Met Mat, Lanzhou 730050, Peoples R China

[2] Lanzhou Univ Technol, Key Lab Nonferrous Met Alloys, Minist Educ, Lanzhou 730050, Peoples R China

来源：

RARE METAL MATERIALS AND ENGINEERING | 2011年 / 40卷 / 04期

关键词：

Co-Al-W superalloy; high-temperature oxidation; activation energy; alloying elements; BASE ALLOYS; DZ40M;

D O I：

暂无

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Co-Al-W alloy is a novel Co-base superalloy, with the precipitation strengthening phase of ternary compound gamma'-Co(3)(Al,W). The kinetic data of oxidation mass gain were measured for the Co-Al-W alloy at 800 and 900 degrees C in air, and the oxidation rate constants at different temperatures were determined by the relevant linear fitting. According to Arrhenius relation of the oxidation rate constants, the activation energy of oxidation was derived for this alloy at 800 and 900 degrees C. It is found that 9W alloy has the highest value of activation energy of oxidation among 7.5W, 9W and 10.7W at different temperatures. The addition of refractory elements Mo, Nb, Ta and Ti can change the mass gain and activation energy of oxidation of the Co-Al-W alloy; therefore, the oxidation resistance of the superalloy at high temperatures can be forecast.

引用

页码：701 / 704

页数：4

共 13 条

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