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Surface modification of W-Ti coatings induced by TEA CO2 laser beam

Published online by Cambridge University Press:  18 January 2002

SUZANA PETROVIĆ ,
B. GAKOVIĆ ,
M. TRTICA  and
T. NENADOVIĆ
SUZANA PETROVIĆ
Affiliation:
Institute of Nuclear Sciences “Vinča”, P.O. Box 522, 11001 Belgrade, Yugoslavia
B. GAKOVIĆ
Affiliation:
Institute of Nuclear Sciences “Vinča”, P.O. Box 522, 11001 Belgrade, Yugoslavia
M. TRTICA
Affiliation:
Institute of Nuclear Sciences “Vinča”, P.O. Box 522, 11001 Belgrade, Yugoslavia
T. NENADOVIĆ
Affiliation:
Institute of Nuclear Sciences “Vinča”, P.O. Box 522, 11001 Belgrade, Yugoslavia
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Abstract

In this work, the interaction of a transversely excited atmospheric (TEA) CO2 laser with tungsten–titanium (W-Ti) alloy deposited on austenitic stainless steel is considered. The W-Ti alloy as a refractory material possesses very good physicochemical characteristics such as thermochemical stability and high melting temperature. Studying of interactions of different energetic particles or laser beams with W-Ti coatings has both application and fundamental importance.

The morphological features of the W-Ti coating, deposited on austenitic stainless steel AISI 316, induced by a TEA CO2 laser after multipulse cumulative laser action, have been considered. The laser pulses with tail (FWHM = 120 ns, tail = 2 μs) and free-tail pulses (FWHM = 80 ns) have been employed. Laser pulses used in the experiment had equal peak power density I = 120 MWcm−2. For the given peak power density, excessive surface changes on the coating were registered. From direct observation on a microscopic scale (OM, SEM), it can be concluded that W-Ti coatings show different behavior under laser irradiation with various temporal pulse shapes.

Type
Research Article
Information
Laser and Particle Beams , Volume 19 , Issue 2 , April 2001 , pp. 195 - 199
Copyright
© 2001 Cambridge University Press

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