Oxidation resistance improvement of Zr-4 alloy in 1000 °C steam environment using ZrO2/FeCrAl bilayer coating

SURFACE & COATINGS TECHNOLOGY

卷:349

Article

Wang, Yu¹  Tang, Hui²  Han, Xiaochun¹  Feng, Wanlin¹  Zhou, Xiaosong¹  Peng, Shuming¹  Zhang, Haibin¹ 

[1] China Acad Engn Phys, Inst Nucl Phys & Chem, Innovat Res Team Adv Ceram, Mianyang 621900, Peoples R China

[2] Univ Elect Sci & Technol China, Sch Energy Sci & Engn, Chengdu 610000, Sichuan, Peoples R China

关键词: ZrO2;    FeCrAl alloy;    Zr-4 alloy;    Plasma electrolytic oxidation;    Magnetron sputtering;   

DOI  :  10.1016/j.surfcoat.2018.05.005

来源: Elsevier

【 摘 要 】

A ZrO2/FeCrAl bilayer coating was prepared on Zr-4 alloy. Plasma electrolytic oxidation (PEO) was used to synthesize the ZrO2 buffer layer and magnetron sputtering was used to deposit the FeCrAl outer layer. The oxidation resistance of the ZrO2/FeCrAl coated Zr-4 alloy was investigated by using 1000 degrees C steam oxidation tests and was compared with the mono-layer FeCrAl coated and uncoted Zr-4 alloys. Morphologies, phase compositions and elemental distributions of the ZrO2/FeCrAl and FeCrAl coated Zr-4 alloys before and after the steam oxidation tests were characterized by SEM, XRD and EDX mapping and line scans. Results indicated that the introduction of the ZrO2 buffer layer effectively eliminated the high temperature inter-diffusion between FeCrAl and Zr-4 alloy, and consequently improved the adherence and integrity of the FeCrAl layer after the 1000 degrees C steam oxidation. As a result, the parabolic rate constant of the ZrO2/FeCrAl coated Zr-4 alloy was decreased by about 20 times compared with that of the uncoated and FeCrAl coated Zr-4 alloys in 1000 degrees C steam environment.

【 授权许可】

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