Abstract
With the aim to obtain the high cavitation-erosion-resistance coating for the surface
safeguard of fluid machinery, two kinds of hard coatings (WC-Cr-Co and Cr3C2-NiCr) were
prepared on 1Cr18Ni9Ti substrate by high velocity oxy-fuel spraying (HVOF), which
microstructure and performance were investigated respectively by optical microscope, X-ray
diffraction, Vickers hardness, scanning electron microscope (SEM), and vibratory cavitation
apparatus. The results indicated that these two coatings had the higher hardness and the finer
structure than ZG06Cr13Ni5Mo, which is used actual in water conservancy. The results of
cavitation erosion continued for 39 hours presented that the mass loss of WC-Cr-Co and Cr3C2
-NiCr coatings increased ceaselessly with time, and the cavitation erosion speeds varied with time.
Compared with ZG06Cr13Ni5Mo, their cavitation erosion resistance performances were better due
to their higher hardness and finer structure, and WC-Cr-Co coating was much better than
Cr3C2-NiCr coating. Obviously, the higher hardness and finer structure could strengthen the
cavitation erosion resistance of coating materials.
Publisher
Trans Tech Publications, Ltd.
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