Oxidation Resistance of Ir/HfO2 Composite Coating Prepared by Chemical Vapor Deposition: Microstructure and Elemental Migration

Author:

Zhu Junyu1,Li Wenting1,Cai Hongzhong1ORCID,Wang Xian1,Wang Xingqiang1,Wei Yan1,Hu Changyi1,Zhao Xingdong1,Zhang Xuxiang1

Affiliation:

1. Kunming Institute of Precious Metals, Kunming 650106, China

Abstract

In this study, a HfO2 coating was developed on an Ir matrix using a customized open-tube airflow, cold-wall chemical vapor deposition instrument. The preparation process and structure of the as-prepared coating were investigated to gain insights into its characteristics. The HfO2 coating effectively prevents direct contact between Ir and O, leading to a reduction in the oxidation rate of Ir. Furthermore, defects such as micropores and cracks generated during sealed oxidation erosion contribute to Ir’s decelerated oxidation failure. The as-prepared HfO2 coating exhibits low thermal conductivity and a high heat radiation rate, reducing the coating’s surface temperature. These characteristics significantly enhance adversity tolerance and increase the working temperature of the coating. Moreover, the as-prepared HfO2 coating can serve as a diffusion barrier, blocking both the direct contact of O with the Ir coating and the diffusion of other elements to the Ir coating. As a result, the rates of diffusion of other elements to the Ir coating are reduced.

Funder

National Science Foundation of China

Scientific and Technological Project of Yunan Precious Metals Laboratory

Yunnan Science and Technology Projects

Publisher

MDPI AG

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