In situ laser cladding of Al2O3bearing coatings on aluminium alloy 7075 for improvement of wear resistance

Tai Man Yue, K. J. Huang, Hau Chung Man

Research output: Journal article publicationJournal articleAcademic researchpeer-review

14 Citations (Scopus)

Abstract

The wear properties of Al2O3bearing coatings, produced by in situ laser Induced thermite reactions fabricated on aluminium alloy 7075, were examined. The thermite reactions were initiated by the laser cladding of mixed powders of CuO-Al, Cr2O3-Al and TiO2-Al. In order to improve the quality of the laser formed coatings, the laser cladding involved two passes of melting. The results of the XRD and XPS analyses showed that in all the three reaction systems, a reaction layer which comprised mainly Al2O3and Al phases was formed. Under dry sliding conditions, the wear resistance, in terms of weight loss, of the laser cladded specimens was considerably higher than that of the uncladded specimens. The predominant wear mechanism of the former specimens was found to be characterised by abrasive, while with the latter specimens, it was the adhesive wear that prevailed.
Original languageEnglish
Pages (from-to)142-146
Number of pages5
JournalSurface Engineering
Volume23
Issue number2
DOIs
Publication statusPublished - 1 Mar 2007

Keywords

  • Aluminium alloy
  • Aluminium oxide
  • In situ
  • Laser cladding
  • Thermite reaction
  • Wear

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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