Regular Article

Preparation and oxidation behavior of novel CeO₂/Y₂O₃-modified aluminide coatings on Ni using sol–gel derived/pack cementation process

¹ Naval Architecture and Port Engineering College, Shandong Jiaotong University, Weihai 264200, PR China
² School of Mechanical Engineering and Automation, Shenyang Institute of Technology, Fushun 113122, PR China

^* e-mail: 222011@sdjtu.edu.cn

Received: 26 April 2022
Accepted: 26 July 2022

Abstract

CeO₂/Y₂O₃-modified aluminide coatings were prepared on Ni substrate using a sol–gel derived/pack cementation process. For comparison, simple aluminide coatings were also produced on Ni substrate using the same pack cementation process. The microstructure and high temperature oxidation behavior of three aluminide coatings at 900 °C for 50 h in air were comparably analyzed using SEM/EDS and XRD. The results indicated that both CeO₂/Y₂O₃-modified aluminide coatings exhibited better oxidation resistance than the CeO₂/Y₂O₃-free one, because of various effects of CeO₂/Y₂O₃ on the oxidation including the grain refinement effect of the aluminide, the “reactive element effect”(REE) and the epitaxial template effect of Y₂O₃ to promote the growth of α-Al₂O₃.