"Analysis of Erosion Resistance of Polyurethane Elastic Coating on Water Turbine Blade Surface" Based on the analysis of the abrasion resistance mechanism of polyurethane elastic coating and the purpose of studying its application in water conservancy engineering surface protection, the sample preparation of sprayed polyurethane elastic coating was carried out And performance testing and analysis of specific experiments, the surface roughness, adhesion, abrasion resistance and other properties of the polyurethane elastic coating.
Experimental results:
1) The cavitation wear of the blade is closely related to the surface roughness of the material. The surface roughness of the polyurethane elastomer reaches 3. Below 2 μm, the formation of water flow vortices on the surface of the material can be suppressed, thereby reducing the formation of cavitation nuclei and slowing down the damage of cavitation to the material.
2) When the functionality of the polyurethane component is selected in 2. 0 ~ 2．Within the scope of 4, the physical bonding force between polyurethane elastic coating and water turbine blade (0Cr13Ni5Mo) can reach 12. 6MPa, to prevent the coating from tearing and peeling off from the substrate under huge impact.
3) When the functionality of the polyurethane component is controlled at 2. 4 ~ 3．In the range of 1, the soft and hard phase block structure of the polyurethane elastic coating endows the material with good elasticity and abrasion resistance. The hard segment bears the cutting force of the abrasive grains, and the soft segment buffers the external impact energy. The synergistic effect of the two keeps the wear value of the coating in a low range of 2-3 mg/1000 r.
4) Taking into account the adhesion and abrasion resistance of the polyurethane elastomer, when the functionality of the polyurethane component is selected as the intersection of the two. 4, the polyurethane elastic coating has excellent comprehensive mechanical properties.
