Impact of plasma-sprayed metal particles on hot and cold glass surfaces

Thermal contact resistance between plasma-sprayed particles and flat surfaces

“…Previous publications [4,19,20,23] have described how splats of molybdenum and zirconia, have been photographed at intervals of a few microseconds during spreading, on both unheated and heated glass surfaces. Fig.…”

“…Photographs of plasma-sprayed molybdenum and yttriastabilized zirconia on glass and Inconel 625 were captured by using an experimental assembly similar to that described in detail by McDonald et al [19] and Mehdizadeh et al [20] and shown in Fig. 1.…”

“…Substrate temperature has been shown to influence the size and morphology of splats formed by molten particles impacting and solidifying during a thermal spray coating process [1][2][3][4]. Droplets of molten zirconia, plasma sprayed onto a stainless steel substrate kept at room temperature, splashed and produced fragmented splats, whereas on a heated substrate they formed circular, disk-like, splats with almost no splashing [5].…”

Formation of Solid Splats During Thermal Spray Deposition

“…When metal surfaces are preheated over the transition temperature ( Ref 4,5,10,13,25,26,30,37,38,40,43,52,56,[60][61][62][63][64][65][66] or treated with laser energy densities high enough to modify the oxide layer (Ref 17,20,58), the surface is changed. In addition to desorbtion of adsorbates, the oxide layer composition, thickness and roughness is modified.…”

Laser-induced forward transfer of pure metals

“…Initially, the ejected droplets were deposited onto a glass receiver, but then the droplets bounce away. Since this bouncing effect was previously attributed to evaporation of volatile elements in the glass [130], the glass receiver was coated with a 100 nm thick copper film (see section 4.3), resulting in disk-shaped solidification. This approach is sufficient for pillar deposition, but it is to be expected that further optimization of the film thickness and material allows to optimize the solidification timescale and thereby allow for a deposition of the droplet in any of the shapes discussed.…”