Laser cladding of Al2O3coating on aluminium alloy by thermite reactions

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

Research output: Journal article publicationJournal articleAcademic researchpeer-review

35 Citations (Scopus)

Abstract

Based on the principle of the thermite reaction of CuO and Al powders, an Al2O3ceramic coating was produced on an aluminium AA7075 alloy substrate by means of laser cladding. SEM, XRD and TEM techniques were employed to study the phases of the coating. The results show that the top coating is a layer of Al2O3, below which is the fusion layer and the substrate. The Al2O3layer primarily consists of the αAl2O3and γ-Al2O3phases. The mechanism of the formation of the top Al2O3layer is explained. It involves a series of thermite reactions and the decomposition of CuO powders. The amount of γ-Al2O3phase present is considered to be governed by the solidification time available for the formation of the phase. Good interfacial bonding is achieved at the fusion layer/γ-Al2O3phase interface.
Original languageEnglish
Pages (from-to)232-237
Number of pages6
JournalSurface and Coatings Technology
Volume194
Issue number2-3
DOIs
Publication statusPublished - 1 May 2005

Keywords

  • C Cladding
  • C Interfaces
  • C Laser
  • D Aluminium alloy
  • X Thermite reaction

ASJC Scopus subject areas

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

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