Influence of micro-nano multiscale surface texture on wettability of Ni-based droplets at high temperature

The wetting behavior of sprayed droplets on textured surfaces is the key factor that determines the adhesion strength of sprayed coatings. The 3-D roughness parameter could be used to describe the textured surface and build the relationship with the wettability of sprayed droplets. Micro and nano sale 3-D roughness parameter of surface texture could be acquired separately through the classification extraction due to the micro-nano multiscale roughness feature of laser textured surface. The contact angle of the sprayed droplets at high temperature on a textured surface with different patterns was studied. The results show that the contact angle of the sprayed droplets increases with increases in the amplitude parameter S-sk and the spatial parameter S-tr, while it decreases with increases in the amplitude parameter S-ku and spatial parameter S-al. The nanoscale debris of the laser textured surface are beneficial for improving the amplitude parameter S-ku, which can increase the wettability of sprayed particles with the substrates.

Automated summary

The wetting behavior of sprayed droplets on textured surfaces is crucial for determining the adhesion strength of sprayed coatings. Different parameters describing surface roughness can impact the contact angle of sprayed droplets. Nanoscale debris on laser textured surfaces can improve wetting properties between coated particles and substrates.