After being dried under ambient condition, the water contact angle and sliding angle on the coating surface were tested to evaluate the wettability of the coating surface.
The water contact angle of the R974 coating could reach 154.7°, and the significant differences in the surface morphology of superhydrophobic coating were presented with different R974 concentrations.
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The composition of the sol, ageing process and size distribution of the particles, the thermal stability of the sols and coatings, the phase composition and microstructure of the coatings and contact angle of the water drop at the coating surface were all investigated.
When the weight content of PPS SR CNTs = 0.7:0.3:0.015, the water contact angle (WCA) and the slide angle (SA) of the prepared coating were (164 ± 1.5)° and (1 ± 0.8 °, respectively.
The contact angle of the Au-PTFE/Ni-P coating with water is 116.9°, which is much bigger than that of the Au/Ni-P coating (23.2°).
When the argon/methane ratio is 4, the surface roughness of the carbon coating is a minimum, while the water contact angle of carbon coating is a maximum.
Based on these works, a computer program was developed to calculate the effects of process parameters, such as gun scanning velocity, spray angle, etc., on the porosity of the coating.
CrSiCN-2 coating, while exhibiting higher erosion rate at low impingement angle, demonstrated reduced erosion rate at higher angle due to the ductile nature of the coating under erosion test condition.
