620 Proposal of new criterion for splashing in flattening of thermal sprayed particle onto flat substrate surface

Splat formation during plasma spraying for 8mol% yttria-stabilized zirconia droplets impacting on stainless steel substrate

“…Splashing of the splats has a decisive effect on final shape of splats. Usually, increasing the substrate temperature [16,17] and thermal contact resistance [21][22][23][24][25] will suppress the splashing. Other studies also confirmed that increasing the Reynolds number and Weber number could promote splashing [4,[18][19][20]31].…”

Adhesion of tin droplets impinging on a stainless steel plate: effect of substrate temperature and roughness

“…They found that droplets splashed only if the so-called 'splash parameter' K ¼ We 0:5 Re 0:25 exceeds a critical value (K c ), which depends on the surface roughness. Fukumoto et al [7] argued that since the deformation of a molten droplet is greatly affected by solidification, provided that the impact and solidification times are of the same order of magnitude, a new splash parameter should be defined to account for the substrate temperature. Li et al [8] suggested that droplet splashing could also be caused by surface contamination.…”

Characterization of plasma sprayed deposits : influence of process parameters

“…At short stand-off distances, there were a significant number of circular splats, all having a fine crack structure. The percent of circular splats decreased as the stand-off distance increased, as an evidence of partially [50]).…”

“…The flattening behavior of the plasma sprayed particles has been investigated extensively by theoretical, analytical and experimental approaches [45], [49], [50], [51], [52], [53], [54], [55], [56], [57], [58], [59]. Basic factors used for evaluation of the splat flattening and formation processes are summarized below (Fig.…”

“…In an effort to explain mechanism of droplet splashing, substrate surface temperature has gained the exceptional attendance in past few years [41], [45], [50], [51], [52], [67], [68], [69], [70], [71], [72], [73]. Results indicate that breakup of thermal spray droplets on a smooth substrate occurs when substrate temperature is below a certain value.…”