Effect of droplet size on the droplet behavior on the heterogeneous surface

Choi, Ho Yeon; Son, Sung Wan; Park, Yong Gap; Ha, Man Yeong

doi:10.1007/s12206-017-0522-5

Cited by 2 publications

(1 citation statement)

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“…In the process of arc spraying, the smaller the atomization pressure is, the smaller the dragging force of the primary dispersed droplet particles will be. The shorter the time of metal droplets staying at the wire tip, the more the primary dispersed droplet particles detached from the wire tip per unit time will be under the condition of a certain wire feeding velocity, which will lead to flying droplets size decrease [11][12][13][14] . The deformation and solidification process of the droplets impacting on the substrate are analyzed, which will help to design a reasonable spraying process and play a positive guiding role.…”

Section: Microstructure and Performance Of Composition Coatingmentioning

confidence: 99%

Deformation and Solidification Characteristics and Microstructure of Arc Sprayed Ni-Al Composition Coatings

Wang

Guo

et al. 2019

Mat. Res.

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Droplets deformation and solidification characteristics in twin-wire arc sprayed Ni-Al were explored in depth. Both theoretical method and numerical model were established for calculating the deformation process of the droplets impacting on the substrate and their solidification behavior in airflow, which based on two models of the volume of fluid (VOF) dual-phase flow and the standard k-ε. The morphology and the microstructure of the composite coatings were analyzed by XRD, SEM and TEM. The results of the experiment indicate the droplets cooling rate ranges from 3.0×10 7 to 7.5×10 7 K/s. The main components of Ni-5wt.% Al coating were Ni solid solution, and a small number of Ni 3 Al 4 , Al 2 O 3 and NiO. The main phases of Ni-20wt.% Al coating are Ni 3 Al and NiAl. EDS and TEM analysis shows that there are a few amorphous and equiaxed crystals in the Ni-Al coating. The surface roughness increases with the decrease of spraying pressure and spraying distance.

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Section: Microstructure and Performance Of Composition Coatingmentioning

confidence: 99%