Motion and heating of powder during thermal spray-deposition of coatings

1985 ◽  
Vol 24 (7) ◽  
pp. 560-565
Author(s):  
S. S. Ermakov ◽  
A. M. Shmakov
Author(s):  
Manpreet Dash ◽  
Sangharsh Kumar ◽  
Partha Pratim Bandyopadhyay ◽  
Anandaroop Bhattacharya

The impact process of a molten metal droplet impinging on a solid substrate surface is encountered in several technological applications such as ink-jet printing, spray cooling, coating processes, spray deposition of metal alloys, thermal spray coatings, manufacturing processes and fabrication and in industrial applications concerning thermal spray processes. Deposition of a molten material or metal in form of a droplet on a substrate surface by propelling it towards it forms the core of the spraying process. During the impact process, the molten metal droplet spreads radially and simultaneously starts losing heat due to heat transfer to the substrate surface. The associated heat transfer influences impingement behavior. The physics of droplet impingement is not only related to the fluid dynamics, but also to the respective interfacial properties of solid and liquid. For most applications, maximum spreading diameter of the splat is considered to be an important factor for droplet impingement on solid surfaces. In the present study, we have developed a model for droplet impingement based on energy conservation principle to predict the maximum spreading radius and the radius as a function of time. Further, we have used the radius as a function of time in the heat transfer equations and to study the evolution of splat-temperature and predict the spreading factor and the spreading time and mathematically correlate them to the spraying parameters and material properties.


Author(s):  
Jyotsna Dutta Majumdar ◽  
Indranil Manna

Functionally Gradient Coatings (FGCs) are emerging materials with an improved service life and have a promising future for the production of (a) tailored components for applications subjected to large thermal gradients, (b) smart coating with improved corrosion and wear resistance, (c) improved fatigue wear, and (d) improved material structures for energy applications like batteries, fuel cells, etc. FGCs may be developed by physical/chemical vapor deposition, electro/electroless deposition, thermal spray deposition technique, etc. Thermal spraying refers to the technique or a group of techniques whereby molten or semi-molten droplets of materials are sprayed onto a solid substrate to develop the coating. In this chapter, detailed overviews of the development of functionally graded coating by thermal spray deposition techniques are presented. In addition, a few research results on the development of functionally graded coating for tribological and thermal barrier applications are presented.


1995 ◽  
Vol 11 (3) ◽  
pp. 215-222 ◽  
Author(s):  
Y. Bao ◽  
D. T. Gawne

2015 ◽  
Vol 356 ◽  
pp. 639-644 ◽  
Author(s):  
Xiuyong Chen ◽  
Yongfeng Gong ◽  
Xinkun Suo ◽  
Jing Huang ◽  
Yi Liu ◽  
...  

2013 ◽  
Vol 232 ◽  
pp. 150-158 ◽  
Author(s):  
Yuqing Bao ◽  
David T. Gawne ◽  
Jiming Gao ◽  
Tao Zhang ◽  
Beatriz Diaz Cuenca ◽  
...  

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