Comparative Study of Mechanical and Morphological Properties of Alumina Coatings Treated by Conventional Furnace and Laser Processing
الكلمات المفتاحية:
Alumina coatings، AISI316 substrates، laser processing، furnace heating، Aluminium oxide، Mechanical propertiesالملخص
Aluminium oxide coating on metallic substrates has attracted attention for a broad range of applications including wear resistance, oxidation and hotcorrosion resistance, heat and thermal shock resistance and electrical insulation. Alumina coatings were prepared via sol-gel route and then dip-coated on the surface of AISI316 substrates. The alumina-coated substrates were treated by two methods include conventional heat treatment furnace and laser processing to study and compare the phase transition and the mechanical properties of sol-gel alumina coatings. The scanning electron microscope (SEM) and Xray diffractometer (XRD) were employed to analyse surface morphology and crystalline structure respectively, whilst the mechanical properties were measured using nanoindentation measurements. The results show that the alumina coatings have converted into crystalline aluminium oxide in both phases of γ-Al2O3 and α-Al2O3. Nanoindentation measurements reveal that the mechanical properties of laser-irradiated alumina coatings in terms of hardness and Young’s modulus are much higher than that of the same alumina coatings treated by conventional furnace heating
