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 language | English |
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Pages (from-to) | 232-237 |
Number of pages | 6 |
Journal | Surface and Coatings Technology |
Volume | 194 |
Issue number | 2-3 |
DOIs | |
Publication status | Published - 1 May 2005 |
Keywords
- C Cladding
- C Interfaces
- C Laser
- D Aluminium alloy
- X Thermite reaction
ASJC Scopus subject areas
- General Chemistry
- Condensed Matter Physics
- Surfaces and Interfaces
- Surfaces, Coatings and Films
- Materials Chemistry