Diamond deposition on Fe-Cr-Al alloy substrates: Effect of native oxidation by XPS and XAS investigation

T. J. Pan, Y. S. Li, Q. Yang, D. M. Korotin, E. Z. Kurmaev, M. Sanchez-Pasten, I. S. Zhidkov, S. O. Cholakh

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

The electronic structures of native oxides formed on Fe-15Cr, Fe-5Al and Fe-15Cr-5Al (all in wt.%) alloys, and the corresponding effects on diamond nucleation and growth in plasma enhanced CH4-H2 atmosphere were investigated. The ambient environment exposure produces a mixed surface oxide layer containing the oxides of both Fe and Cr or Al on Fe-15Cr or Fe-5Al alloys, respectively. A selective oxidation of Al occurs on Fe-15Cr-5Al and it protects the other two substrate elements from oxidation. The diamond deposition behavior indicates that prior to diamond growth, a graphite intermediate layer preferentially forms on Fe-15Cr and Fe-5Al alloys, along with an internal carburization of the substrates. For Fe-15Cr-5Al, only a single diamond coating with enhanced interfacial adhesion is produced, which is attributed to the effective barrier property of the aluminum oxide passive layer.

Original languageEnglish
Pages (from-to)887-894
Number of pages8
JournalJournal of Alloys and Compounds
Volume740
DOIs
Publication statusPublished - 5 Apr 2018
Externally publishedYes

Keywords

  • CVD
  • Diamond
  • Ferrous alloy
  • Native oxide

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