A laser thermal cycling rig as a new method to characterize the evolution of coating adhesion under thermal cycle

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EditorSearch for: Lima, R. S.; Search for: Agarwal, A.; Search for: Hyland, M. M.; Search for: Lau, Y.-C.; Search for: Li, C.-J.; Search for: McDonald, A.; Search for: Toma, F.-L.
Proceedings titleThermal Spray 2012 : Proceedings from the International Spray Conference
ConferenceInternational Thermal Spray 2012 Conference and Exposition (ITSC 2012), 21-24 May 2012, Houston, Texas, USA
Pages137142; # of pages: 6
AbstractThermal sprayed coatings are often used for high temperature applications and, per se, are subjected to transient temperature gradients during operation. The recurrent temperature changes generate stresses that damage the coating with time, and can even lead to its delamination. The most common methods to evaluate coating behavior under thermal cycling are furnace testing or burner rigs. Both approaches cannot match the conditions reached in service for several applications, in term of the achievable heating rates for instance. As a consequence, a versatile and robust method to evaluate coating resistance to spalling under thermal cycles is still to be found. This paper presents the development of a thermal cycling rig where the heat input is provided by a laser. This rig allows easy testing of several samples jointly for heating rates as high as 55°C/s and for thousands of thermal cycles. Preliminary trials have allowed the development of different spalling criteria. Finally, it was found that SS430-based materials arc-sprayed on Al substrates exhibit higher delamination resistance (life) under rapid heating/cooling cycles than SS304 coatings on the same substrate. For such high heating rates, the thermal stresses generated in the coating would be more critical than the thermal mismatch at the interface coating/substrate.
Publication date
AffiliationNational Research Council Canada; NRC Industrial Materials Institute
Peer reviewedYes
NRC number139274
NPARC number21047059
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Record identifieraa4ecd7f-ab9e-406b-8e22-4bbe8ffb0cbf
Record created2012-11-28
Record modified2016-05-09
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