Modeling and visualization of plasma spraying of functionally graded materials and its application to the optimization of spray conditions

Citation
Yp. Wan et al., Modeling and visualization of plasma spraying of functionally graded materials and its application to the optimization of spray conditions, J THERM SPR, 10(2), 2001, pp. 382-389
Citations number
13
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Material Science & Engineering
Journal title
JOURNAL OF THERMAL SPRAY TECHNOLOGY
ISSN journal
1059-9630 → ACNP
Volume
10
Issue
2
Year of publication
2001
Pages
382 - 389
Database
ISI
SICI code
1059-9630(200106)10:2<382:MAVOPS>2.0.ZU;2-2
Abstract
This paper presents a simulation and visualization system for plasma sprayi ng of functionally graded materials (FGM), The recently modified CFD code, LAVA-P, that incorporates a well-verified model for plasma gas flow and che mistry is employed. The particle movement and its trajectory are described within a Lagrangian formulation by considering drag as the major driving fo rce, and the particle melting, evaporation, and resolidification are consid ered using a recently developed model for particle-flame interaction. In ad dition to the noncontinuum and variable property effects associated with hi gh-temperature plasma, the effects of particle evaporation on particle mome ntum and heat transfer are also taken into account. Calculations are perfor med for NiCrAlY and ZrO2 powders for a wide range of size distributions. Th e influences of power levels and flow rate of H-2 on plasma flow field and, hence, on the particle velocity and temperature are investigated, The pred icted velocity and temperature fields agree well with the measurements unde r similar spraying conditions, With the help of a special in-house built pr ocess animation and visualization algorithm, the powder injection condition s, such as the number of injectors, injector location, and injection veloci ty, are investigated and can be optimized to obtain coatings with a specifi ed distribution of different species.