The Bonding State and Surface Roughness of Carbon-Doped TiZrN Coatings for Hydrogen Permeation Barriers

Author:

Kim Seonghoon1,Kim Taewoo2,Lee Seungjae1ORCID,Lee Heesoo1

Affiliation:

1. School of Materials Science and Engineering, Pusan National University, Busan 46241, Republic of Korea

2. Nuclear Power Industry Division, Korea Institute of Energy Technology Evaluation and Planning, Seoul 02792, Republic of Korea

Abstract

We doped carbon into a TiZrN coating to reduce hydrogen permeability, and investigated the phase formation, bonding state, microstructure, and surface roughness of the carbon-doped TiZrN. The laser output for laser carburization was limited to a range of 20–50%. The grain size of the TiZrN coatings decreased from 26.49 nm before carburization to 18.31 nm after carburization. For XPS analysis, the sp2/sp3 ratio was 1.23 at 20% laser output, but it showed 2.64 at 40% laser output, which means that amorphous carbon was formed. As the grain size decreased with the formation of amorphous carbon, the surface microstructure of the carbon-doped TiZrN coatings transitioned to an intergranular structure, indicating the creation of amorphous carbon-embedded (Ti, Zr)(C, N) in the coating. The surface roughness (Ra) of the carbon-doped TiZrN coating was decreased to a maximum of 7.12 nm, and the hydrogen permeability correspondingly decreased by 78% at 573 K.

Funder

Korea Institute for Advancement of Technology

Publisher

MDPI AG

Subject

General Materials Science,General Chemical Engineering

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