Title: Spraying Process of Al-based Amorphous and Nanocrystalline Composite Coatings
Abstract: To investigate the effect of spray parameters on coating properties,the Al-based amorphous and nanocrystalline composite coatings were prepared by high velocity arc spraying technique under different spraying processes.The effects of spray parameters,such as spray current,voltage,distance,gun movement speed and air pressure on the coating characterizations were investigated.The orthogonal experiment results show that the optimum spraying process parameters are sprayed by a current of 160 A,spray voltage of 36 V,pray distance of 200 mm,gun transverse speed of 300mm/s,and air pressure of 0.7MPa.The primary and secondary orders of spray parameters on coating performance is air pressure,spray voltage,gun transverse speed,spray current,and pray distance.The microstructures of the coatings were analyzed by the scanning electron microscope(SEM),energy dispersive spetrometer(EDS),X-ray diffraction(XRD)and transmission electron microscope(TEM).The microhardness and porosity of the coating were tested.The results show that the composite coatings under the spraying parameters have a compact structure with a low porosity of about 1.13%,and the microhardness value of 392HV0.1.The volumn fraction of amorphous phase is 24.2%.
Publication Year: 2015
Publication Date: 2015-01-01
Language: en
Type: article
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