Laser Patterning Pretreatment before Thermal Spraying: A Technique to Adapt and Control the Surface Topography to Thermomechanical Loading and Materials

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• 作者：Robin Kromer ; Sophie Costil ; Jonathan Cormier…
• 关键词：adhesion testing ; thermal barrier coating ; atmospheric plasma spray (APS) ; Nd ; YAG laser ; laser surface texturing ; grit ; blasting
• 刊名：Journal of Thermal Spray Technology
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：25
• 期：3
• 页码：401-410
• 全文大小：2,297 KB
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• 作者单位：Robin Kromer (4)
  Sophie Costil (1)
  Jonathan Cormier (2)
  Laurent Berthe (3)
  Patrice Peyre (3)
  Damien Courapied (3)
  
  4. Université de Bourgogne Franche Comté, UTBM IRTES-LERMPS, Belfort Cedex, 90010, France
  1. IRTES-LERMPS Institute, UTBM, Belfort Cedex, 90010, France
  2. Institut Pprime, Mechanics and Materials Science Laboratory, UPR CNRS 3346, ISAE-ENSMA, Téléport 2, 1, Avenue Clément Ader, BP 40109 86961, Chasseneuil-Futuroscope, France
  3. PIMM, UMR 8006 CNRS, Arts et Métiers Paristech, 151 Bd De l’Hôpital, 75013, Paris, France
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Surfaces and Interfaces and Thin Films
  Tribology, Corrosion and Coatings
  Materials Science
  Characterization and Evaluation Materials
  Operating Procedures and Materials Treatment
  Analytical Chemistry
  
• 出版者：Springer Boston
• ISSN：1544-1016

文摘

Coating characteristics are highly dependent on substrate preparation and spray parameters. Hence, the surface must be adapted mechanically and physicochemically to favor coating–substrate adhesion. Conventional surface preparation methods such as grit blasting are limited by surface embrittlement and produce large plastic deformations throughout the surface, resulting in compressive stress and potential cracks. Among all such methods, laser patterning is suitable to prepare the surface of sensitive materials. No embedded grit particles can be observed, and high-quality coatings are obtained. Finally, laser surface patterning adapts the impacted surface, creating large anchoring area. Optimized surface topographies can then be elaborated according to the material as well as the application. The objective of this study is to compare the adhesive bond strength between two surface preparation methods, namely grit blasting and laser surface patterning, for two material couples used in aerospace applications: 2017 aluminum alloy and AISI 304L stainless steel coated with NiAl and YSZ, respectively. Laser patterning significantly increases adherence values for similar contact area due to mixed-mode (cohesive and adhesive) failure. The coating is locked in the pattern. Keywords adhesion testing thermal barrier coating atmospheric plasma spray (APS) Nd-YAG laser laser surface texturing grit-blasting