Abstract
In this paper, the microstructure and element distribution of the Ni-Al coating prepared with the nickel coated aluminum composite powder, aluminum coated nickel composite powder and Ni-Al composite wire are studied by Scanning Electron Microscopy. Energy dispersive spectrometer element mapping was employed to obtain elemental composition at different areas of the powder and coating cross-section. X-ray diffraction and thermogravimetry differential thermal analysis are used to qualitatively analyze the phase. Finally, the reaction mechanism of Ni-Al in thermal spraying process is studied. It is found that the quality of Ni-Al coating obtained by aluminum coated nickel powder is better than that of nickel coated aluminum powder. Compared with Ni-Al composite powder, the spraying efficiency of Ni-Al composite wire flame spraying is higher.
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