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), pp. 2715-2724. (doi:10.1016/j.surfcoat.2007.10.006).

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Description/Abstract

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 ?m undergo melting and solidification prior to impact while the particle larger than 20 ?m never reach liquid state during the process.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1016/j.surfcoat.2007.10.006
ISSNs: 0257-8972 (print)
Keywords: CFD, HVOF, gas dynamics, particle modeling
Subjects:
ePrint ID: 54086
Date :
Date Event
June 2007Submitted
2008Published
Date Deposited: 04 Aug 2008
Last Modified: 16 Apr 2017 17:47
Further Information:Google Scholar
URI: http://eprints.soton.ac.uk/id/eprint/54086

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