Due to the erosion caused by particles and gas, hydropower plants using silt water for power generation will suffer serious metal loss. Many factories use oxygen combustion supersonic flame spraying process (HVOF) to produce coatings, so as to improve the service life of equipment.
There are also factories using air combustion supersonic flame spraying technology(HVAF). This technology can provide higher particle velocity and lower spraying temperature, so it can obtain more compact non oxidation coating.
Many people will ask whether HVOF or HVAF is better for combustion? In the condition where HVOF particle velocity reached 740m / s and HVAF particle velocity reached 895m / s and 1010m / s, we used WC10Co4Cr. Then we compared the mechanical properties of the two sprayed coatings, including porosity, hardness, indentation toughness and gas corrosion resistance. The surface damage of the coating was analyzed by scanning electron microscope (SEM). The weight loss of the eroded coating surface was measured at different time periods. The uniformity of bond strength of each coating was qualitatively detected by measuring the scratch depth of cross section. The results show that HVAF coating has low porosity, high hardness and excellent gas corrosion resistance. The phenomenon of carbide particles peeling and falling off can be observed in HVOF coating, but this phenomenon is relatively less in the damaged area of HVAF coating. For WC10Co4Cr or high velocity oxyfuel fuel spraying powder, search wococarbide for more information.
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