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Synthesis of Nanostructured WC Films by Supersonic Impaction of Nanoparticle Aerosols

Published online by Cambridge University Press:  21 February 2011

W.T. Nichols ,
G. Malyavanatham ,
M.P. Beam ,
D.E. Henneke ,
J.R. Brock ,
M.F. Becker  and
J.W. Keto
W.T. Nichols
Affiliation:
Department of Physics, University of Texas at Austin, Austin, TX 78712
G. Malyavanatham
Affiliation:
Texas Materials Institute-Materials Science and Engineering, University of Texas at Austin, Austin, TX 78712
M.P. Beam
Affiliation:
Department of Physics, University of Texas at Austin, Austin, TX 78712
D.E. Henneke
Affiliation:
Department of Chemical Engineering, University of Texas at Austin, Austin, TX 78712
J.R. Brock
Affiliation:
Department of Chemical Engineering, University of Texas at Austin, Austin, TX 78712
M.F. Becker
Affiliation:
Texas Materials Institute-Materials Science and Engineering, University of Texas at Austin, Austin, TX 78712 Department of Electrical and Computer Engineering, University of Texas at Austin, Austin, TX 78712
J.W. Keto
Affiliation:
Department of Physics, University of Texas at Austin, Austin, TX 78712 Texas Materials Institute-Materials Science and Engineering, University of Texas at Austin, Austin, TX 78712
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Abstract

Tungsten carbide (WC) coatings were prepared using supersonic impaction of nanoparticles produced by pulsed laser ablation of microparticle aerosols. The influence of experimental parameters such as, carrier gas type and impaction velocity on the structure, composition and physical properties of the resultant particles and films were studied. It was found that stoichiometric, crystalline films could be grown. These films pass both the adhesive lift off and scratch tests. TEM investigations indicate that the laser ablation forms individual particles with mean size of 7 ± 3 nm. At the highest aersol pressures small aggregates were also observed, and adjustment of the gas pressure in the laser interaction cell was found to control the degree of aggregation. Upon impaction, the separate particles form dense, self sintering nanocrystalline films, with helium forming the most dense as determined from SEM images.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 581: Symposium F – Nanophase & Nanocomposite Materials II , 1999 , 193
Copyright
Copyright © Materials Research Society 2000

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References

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