Monitoring Particle Impact on a Substrate during Plasma Spray Process

Plasma-jet coating of preoxidized XC38 steel: influence of the nature of the oxide layer

“…9d). As shown in previous work, 11 splats are disks as soon as the preheating temperature is over 523 K for alumina and when the surface roughness exhibit Ra < 0.1 mm which is almost the case for the Fe 3 O 4 oxide layer (see Table 3). The microcrack network appearing within them is related to their excellent bonding with the underlying Fe 3 O 4 layer and the relaxation of their quenching stress.…”

“…In the used spraying conditions, alumina particles impact on the substrate or on the previously deposited layers at a mean surface temperature of 3000 K and velocity of 250 m s À1 . 10,11 In order to better understand the role of the substrate oxide layer on the flattening alumina droplets and splats formation, the powder flowrate has been reduced to 30 g l À1 . Fig.…”

Nano-heat-sink thin film composite of PC/three-dimensional networked nano-fumed silica with exquisite hydrophobicity

“…The cooling rate of the attening droplet has been anticipated by a one-dimensional heat conduction model. It depends on the following effects: [62][63][64] (a) The cooling rate depends on the quality of the contact between the attened droplet and the underlying material. A very simple model gives the cooling velocity as:…”

The Dynamics of Deposit Formation in Thermal-Spray Processes

“…However, they cannot predict the breakup or splashing of the particles onto the surface. Experimental data 14 and onedimensional heat-transfer models of splat cooling 36 have shown the drastic influence of the value of the interfacial thermal resistance on splat cooling. 34 This model showed that for an alumina droplet thermalsprayed on a cold surface, the particle breaks in the form of a corona of fluid around the splat.…”