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Combined laser/sol-gel synthesis of Si/O/C coatings on mild steel
Ezz, T; Crouse, Philip; Li, Lin
Surface and Coatings Technology. 2006;200:6395-6399.
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Abstract
Si/O/C coatings show promise of having a low coefficient of friction, being reasonably hard and wear resistant, as well as being non-wettable. Sol-gel methods are normally used for their deposition. Results are presented here which show the use of a new laser-based technology for the deposition of these coating. Synthesis was achieved by irradiation under submerged conditions using different wavelengths. Experimental results using high-power CO2 (10.6 mu m) and Nd:YAG (1064 nm, 5 kHz) lasers under otherwise roughly equivalent experimental conditions are reported. The Nd:YAG yielded superior coatings. For CO2 coating, the power is absorbed in the bulk of the sol-gel, giving extremely porous films. The higher peak power of the Nd:YAG and its lower absorption by the sol-gel leads to rapid heating of the interface, heating of the solution by conduction, and a much more adhesive and dense coating. Relatively thick coatings, of the order of 4-5 mu m, compared to those produced by other sol-gel methods are obtained. Coatings are evaluated in terms of nanohardness, microstructure and elemental composition. Corrosion resistance was roughly evaluated gravimetrically in HCl corrosive media. Subsequent heat treatment and re-melting of the coated layer lead to poorer corrosion resistance.