An in-operando evaluation identified the oxidative failure mechanism of TiN hard coatings during extreme thermal cycling

Mehdi Rouhani, Sai Bhavani Sravan Metla, Jonathan Hobley, Yeau-Ren Jeng

研究成果: Article同行評審

2 引文 斯高帕斯(Scopus)

摘要

We determine the definitive failure mechanism of passivated TiN films by in-operando monitoring extreme temperature (650 °C) induced microstructure, chemical, and mechanical changes. Films were in-operando characterized using Raman and optical microscopy, in air and argon, and post-mortem using nanoindentation, XPS, XRD, and microscopy. Initially, TiO2 anatase forms from pre-existing anatase-rich nucleation centers. These develop into domed bulges of condensed N2 gas in the sub-surface. This initial oxidation is limited to the surface. However, during cooling, cracks propagate from the bubbles, leading to wide-area delamination of the films. These cracks provide a pathway for further destructive bulk oxidation to rutile. This insight into failure mechanism provides deposition protocol for coatings operated under demanding conditions.

原文English
文章編號158375
期刊Applied Surface Science
640
DOIs
出版狀態Published - 2023 12月 15

All Science Journal Classification (ASJC) codes

  • 凝聚態物理學
  • 表面和介面
  • 表面、塗料和薄膜

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