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Tuesday, June 03, 2008, Auditorium 2 4:25 PM Junior Session This session will deal with different topics, most promising young talents, both from industry and universities will report shortly about their work. This session is accompanied by a special poster exposition. All visitors of this session are allowed to elect their favorite contribution, the winner will be anounced on the awards banquet |
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Understanding coating formation in real time via monitoring of residual stress development
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Alfredo Valarezo* / SUNY Stony Brook University
Center for Thermal Spray Research
Materials Science & Engineering Department
, USA Eduardo Mari/ Center for Thermal Spray Research / SUNY Stony Brook University , USA Sanjay Sampath/ Center for Thermal Spray Research / SUNY Stony Brook University , USA |
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In flight diagnostics systems and post-deposition characterization have been used to monitor, control the process and to evaluate their effects on the properties of thermal sprayed coatings. However, limited information is usually gathered during the actual deposition stages. Monitoring residual stress build-up during spraying is emerging as the novel tool to understand in real-time the formation of coatings layer by layer. In the present study, we focus particularly on high particle velocity thermal spray processes where the impact is an important contributor in deposit evolution, by peening the underlying layers resulting in strain-hardened sometimes densified sublayers with a compressive residual stress state in metallic and cermet coatings. In this paper, we study the evolution of residual stresses during coating deposition through insitu curvature monitoring for various process conditions, deposition materials, substrate materials and substrate conditions (temperature/roughness). The results reveal important insights into coating build up processes with concomitant implications on properties and performance. |