Micro-arc oxidation for improving high-temperature oxidation resistance of additively manufacturing Ti2AlNb

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Y.H. Zhou
  • P.H. Chen
  • D.N. Huang
  • Z.Z. Wu
  • M. Yan

Detail(s)

Original languageEnglish
Article number128719
Journal / PublicationSurface and Coatings Technology
Volume445
Online published18 Jul 2022
Publication statusPublished - 15 Sep 2022

Abstract

The poor formability and high-temperature oxidation resistance of Ti2AlNb-based intermetallics (for example, Ti–22Al–25Nb at. %, nominal composition) are considered to be the main obstacles that need to be overcome in critical high-temperature applications. In this study, micro-arc oxidation (MAO) was applied to Ti2AlNb additively manufactured by selective laser melting (SLM). SLM offered advanced forming capabilities, while MAO enhanced the mechanical and chemical properties of the materials. The MAO coating comprised an amorphous layer, a nanocrystalline oxide layer, and a continuous TiO2 layer. The multi-layers structure of MAO coating significantly improved the high-temperature oxidation resistance by blocking inward oxygen diffusion. The pulse frequency had significant effects on the microstructure, hardness, and wear resistance of the MAO coatings. Low pulse frequency led to thick MAO coatings with coarse surface roughness, large crater-like pores, and serious surface cracks. High pulse frequency improved the hardness and wear resistance of the MAO coatings. A pulse frequency of 1000 Hz deteriorated the wear resistance of MAO coating caused by the poor metallurgical bonding between the substrate and MAO coating. This study demonstrated the possibility of employing MAO to enhance the critical properties of the Ti2AlNb-based intermetallics fabricated by SLM.

Research Area(s)

  • High-temperature oxidation resistance, Micro-arc oxidation (MAO), Multi-layer MAO coating, Selective laser melting (SLM), Ti2AlNb

Citation Format(s)

Micro-arc oxidation for improving high-temperature oxidation resistance of additively manufacturing Ti2AlNb. / Zhou, Y.H.; Chen, P.H.; Huang, D.N. et al.

In: Surface and Coatings Technology, Vol. 445, 128719, 15.09.2022.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review