LI Yong, LI Taijiang, LI Jutao, et al. Characterization on microstructures and properties of WC-CoCr coating deposited by HVAF and HVOF processes[J]. Thermal power generation, 2015, 44(4): 96-99.
LI Yong, LI Taijiang, LI Jutao, et al. Characterization on microstructures and properties of WC-CoCr coating deposited by HVAF and HVOF processes[J]. Thermal power generation, 2015, 44(4): 96-99.DOI:
Microstructures and properties of WC-CoCr coatings are dominantly determined by fabrication processes.The microstructures and properties of the WC-CoCr coatings sprayed by the active combustion high velocity air fuel(HVAF)and conventional high velocity oxygen fuel(HVOF)processes were comparatively investigated.The results show that
the HVAF and HVOF sprayed coating exhibited porosities of 0.2% and 2.3%
respectively.The HVAF coating shows a dense and uniform microstructure and low surface roughness.Cracking of WC hardness particles in HVAF sprayed coating occurs during the impact with underlying coating or substrate.WC hardness particles in coating exhibited a small size distribution and less degrading indicated by X-ray diffraction.Vickers hardness of 1 450 was examined for the HVAF sprayed coating.The erosion resistances at 15°impact angle of the HVAF coatings are improved by 59.4%and 104.1% when compared with the HVOF sprayed coating and substrate
respectively.The erosion resistances at 90°impact angle of the HVAF coatings are improved by 16% compared with the HVOF sprayed coating.