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Microstructure of Ni–Al powder and Ni–Al composite coatings prepared by twin-wire arc spraying 被引量:3
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作者 Ji-xiao Wang Gui-xian Wang +5 位作者 Jing-shun Liu Lun-yong Zhang Wei Wang Ze Li Qi-xiang Wang Jian-fei Sun 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 2016年第7期810-818,共9页
Ni–Al powder and Ni–Al composite coatings were fabricated by twin-wire arc spraying(TWAS). The microstructures of Ni-5wt%Al powder and Ni-20wt%Al powder were characterized by scanning electronic microscopy(SEM) ... Ni–Al powder and Ni–Al composite coatings were fabricated by twin-wire arc spraying(TWAS). The microstructures of Ni-5wt%Al powder and Ni-20wt%Al powder were characterized by scanning electronic microscopy(SEM) and energy dispersive spectroscopy(EDS). The results showed that the obtained particle size ranged from 5 to 50 μm. The morphology of the Ni–Al powder showed that molten particles were composed of Ni solid solution, NiAl, Ni_3Al, Al_2O_3, and NiO. The Ni–Al phase and a small amount of Al_2O_3 particles changed the composition of the coating. The microstructures of the twin-wire-arc-sprayed Ni–Al composite coatings were characterized by SEM, EDS, X-ray diffraction(XRD), and transmission electron microscopy(TEM). The results showed that the main phase of the Ni-5wt%Al coating consisted of Ni solid solution and Ni Al in addition to a small amount of Al_2O_3. The main phase of the Ni-20wt%Al coating mainly consisted of Ni solid solution, Ni Al, and Ni_3Al in addition to a small amount of Al and Al_2O_3, and Ni Al and Ni_3Al intermetallic compounds effectively further improved the final wear property of the coatings. TEM analysis indicated that fine spherical NiAl_3 precipitates and a Ni–Al–O amorphous phase formed in the matrix of the Ni solid solution in the original state. 展开更多
关键词 spraying powder composite coatings aluminum alloys intermetallics microstructure
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