Study of in-flight and impact dynamics of non-spherical particles from HVOF guns
Study of in-flight and impact dynamics of non-spherical particles from HVOF guns
High velocity oxygen fuel thermal spray has been widely used to deposit hard composite materials such as WC-Co powders for wear-resistant applications. Unlike gas atomized spherical powders, WC-CO powders form a more complex geometry. The knowledge gained from the existing spherical powders on process control and optimization may not be directly applicable to WC-Co coatings. This paper is the first to directly examine nonspherical particle in-flight dynamics and the impingement process on substrate using computational methods. Two sets of computational models are developed. First, the in-flight particles are simulated in the CFD-based combusting gas flow. The particle information prior to impact is extracted from the CFD results and implemented in a FEA model to dynamically track the impingement of particles on substrate. The morphology of particles is examined extensively including both spherical and nonspherical powders to establish the critical particle impact parameters needed for adequate bonding.
cfd, fea, hvof, impingement, nonspherical, wc-co
31-41
Gu, Sai
a6f7af91-4731-46fe-ac4d-3081890ab704
Kamnis, S.
3ca869e0-8c18-4454-94f6-7fb4d2defa23
January 2010
Gu, Sai
a6f7af91-4731-46fe-ac4d-3081890ab704
Kamnis, S.
3ca869e0-8c18-4454-94f6-7fb4d2defa23
Gu, Sai and Kamnis, S.
(2010)
Study of in-flight and impact dynamics of non-spherical particles from HVOF guns.
Journal of Thermal Spray Technology, 19 (1-2), .
(doi:10.1007/s11666-009-9382-6).
Abstract
High velocity oxygen fuel thermal spray has been widely used to deposit hard composite materials such as WC-Co powders for wear-resistant applications. Unlike gas atomized spherical powders, WC-CO powders form a more complex geometry. The knowledge gained from the existing spherical powders on process control and optimization may not be directly applicable to WC-Co coatings. This paper is the first to directly examine nonspherical particle in-flight dynamics and the impingement process on substrate using computational methods. Two sets of computational models are developed. First, the in-flight particles are simulated in the CFD-based combusting gas flow. The particle information prior to impact is extracted from the CFD results and implemented in a FEA model to dynamically track the impingement of particles on substrate. The morphology of particles is examined extensively including both spherical and nonspherical powders to establish the critical particle impact parameters needed for adequate bonding.
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Published date: January 2010
Keywords:
cfd, fea, hvof, impingement, nonspherical, wc-co
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Local EPrints ID: 149235
URI: http://eprints.soton.ac.uk/id/eprint/149235
PURE UUID: 81086fdc-641e-4238-b8bb-64e9f325f197
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Date deposited: 06 May 2010 08:53
Last modified: 14 Mar 2024 01:05
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Author:
Sai Gu
Author:
S. Kamnis
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