Mathematical modelling of Inconel 718 particles in HVOF thermal spraying
Kamnis, S., Gu, Sai. and Zeoli, N. (2008) Mathematical modelling of Inconel 718 particles in HVOF thermal spraying. Surface and Coatings Technology, 202, (12), 2715-2724. (doi:10.1016/j.surfcoat.2007.10.006).
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High velocity oxygen fuel (HVOF) thermal spray technology is able to produce very dense coating without over-heating powder particles. The quality of coating is directly related to the particle parameters such as velocity, temperature and state of melting or solidification. In order to obtain this particle data, mathematical models are developed to predict particle dynamic behaviour in a liquid fuelled high velocity oxy-fuel thermal spray gun. The particle transport equations are solved in a Lagrangian manner and coupled with the three-dimensional, chemically reacting, turbulent gas flow. The melting and solidification within particles as a result of heat exchange with the surrounding gas flow is solved numerically. The in-flight particle characteristics of Inconel 718 are studied and the effects of injection parameters on particle behavior are examined. The computational results show that the particles smaller than 10 μm undergo melting and solidification prior to impact while the particle larger than 20 μm never reach liquid state during the process.
|Keywords:||CFD, HVOF, gas dynamics, particle modeling|
|Subjects:||Q Science > Q Science (General)|
|Divisions:||University Structure - Pre August 2011 > School of Engineering Sciences
|Date Deposited:||04 Aug 2008|
|Last Modified:||14 Apr 2014 09:53|
The Centre for Advanced Tribology at Southampton
Funded by: EPSRC (EP/F034296/1)
Led by: Philip Arthur Nelson
1 April 2008 to 31 March 2013
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