In-situ formation of ceramic layer on Mo-based composites via laser powder bed fusion

Weiwei Zhou, Keiko Kikuchi, Naoyuki Nomura, Kyosuke Yoshimi, Akira Kawasaki

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Poor oxidation resistance is a longstanding disadvantage of Mo-based materials for ultrahigh-temperature applications. In this study, we developed a facile strategy for depositing an in-situ ceramic layer on the surface of Mo-based composites via laser powder bed fusion (L-PBF) using Mo-based alloy powders covered with uniform Al2O3 nanoparticles and bridged by functionalized carbon nanotubes. The surface layer consisted of an α-Al2O3 matrix with a dispersed TiC phase and had a controllable thickness. The formation mechanism of this layer was investigated systematically through single-track observations and finite-element simulation. Moreover, the increased nanohardness can be attributed to the uniformly dispersed, intimately contacted ceramic nanoparticles in the matrix. The results indicated the multifunctionality of L-PBF-processed metallic parts, introducing the possibility of fabricating advanced ultrahigh-temperature materials.

Original languageEnglish
Article number100655
JournalMaterialia
Volume10
DOIs
Publication statusPublished - 2020 May

Keywords

  • Carbon nanotubes
  • Laser powder bed fusion
  • Metal matrix composites
  • Molybdenum, oxidation resistance

ASJC Scopus subject areas

  • Materials Science(all)

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