Influence of substrate surface conditions on the plasma sprayed ceramic and metallic particles flattening

Syed, A. A.; Denoirjean, Alain; Hannoyer, B.; Fauchais, Pierre; Denoirjean, Paule; Khan, Amir Azam; Labbé, Jean-Claude

doi:10.1016/j.surfcoat.2005.01.014

Cited by 52 publications

(25 citation statements)

References 28 publications

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“…When metal surfaces are preheated over the transition temperature ( Ref 4,5,10,13,25,26,30,37,38,40,43,52,56,[60][61][62][63][64][65][66] or treated with laser energy densities high enough to modify the oxide layer (Ref 17,20,58), the surface is changed. In addition to desorbtion of adsorbates, the oxide layer composition, thickness and roughness is modified.…”

Section: Substrate Surface Modificationsmentioning

confidence: 99%

Formation of Solid Splats During Thermal Spray Deposition

2009

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This paper reviews the findings of recent research on the formation of solid splats by the impact of thermal spray particles on solid substrates. It discusses methods of describing the substrate, by characterizing both chemical (oxide layers) and physical (surface topography, adsorbed and condensed contaminants) aspects. Recent experiments done to observe impact of thermal spray particle are surveyed and techniques used to photograph particle impact and measure cooling rates described. The use of numerical modeling to simulate impact and deformation of impacting particles is appraised. Two different break-up mechanisms are identified: solidification around the edges of splats; and perforations in the interior of thin liquid films created by droplet spreading without solidification. These two modes can be reproduced in numerical models by varying the value of thermal contact resistance between the splat and substrate. A simple criterion to predict the final splat shape is presented.

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Section: Substrate Surface Modificationsmentioning

confidence: 99%

Formation of Solid Splats During Thermal Spray Deposition

2009

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“…The underlying cause of the change in splat morphology is not clearly understood. It has been attributed to desorption of gases ( Ref 7,8,11,12), oxidation of the surface ( Ref 3,9), and changes in surface roughness (Ref 1, 3). Jiang (Ref 11) showed that the contact area between splat and substrate is increased and the adhesion is improved on substrates where the adsorbed gas has been removed or reduced.…”

Section: Introductionmentioning

confidence: 99%

Effects of Surface Chemistry on Splat Formation During Plasma Spraying

et al. 2008

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Ni-Cr single splats were plasma-sprayed at room temperature onto aluminum and stainless steel substrates, which were modified by thermal and hydrothermal treatments to control the oxide surface chemistry. The proportions of the different splat types were found to vary as a function of substrate pretreatment, especially when the pretreatment involved heating. It was observed that surface roughness did not correlate with changes in splat morphology. Substrate surfaces were characterized by X-ray photoelectron spectroscopy using in situ heating in vacuum to determine the effect of thermal pretreatment on substrate surface chemistry. It was found that the surface layers were composed primarily of oxyhydroxides. When the substrates were heated to 350°C, water vapor was released from the dehydration of oxyhydroxide. Preheating the substrate can remove the water prior to spraying: preheated substrates had improved the physical contact between the splat and substrate, which enhanced the formation of disk splats and increased the number of splats.

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“…Denoirjean et al (Ref 61,62) demonstrated that ceramic (Al 2 O 3 ) coatings deposited onto lowcarbon steel substrates previously oxidized up to 300°C under a CO 2 atmosphere significantly improved the coating tensile adhesion. These improvements are related to the growth of a Wü stite (FeO) layer on top of the metallic Journal of Thermal Spray Technology substrates during the oxidizing step, which leads to epitaxial solidification of the alumina lamellae.…”

Section: Laser-integrated Pretreatmentsmentioning

confidence: 99%

Pre-/During-/Post-Laser Processes to Enhance the Adhesion and Mechanical Properties of Thermal-Sprayed Coatings with a Reduced Environmental Impact

et al. 2011

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Document VersionPublisher's PDF, also known as Version of Record (includes final page, issue and volume numbers) Please check the document version of this publication:• A submitted manuscript is the author's version of the article upon submission and before peer-review. There can be important differences between the submitted version and the official published version of record. People interested in the research are advised to contact the author for the final version of the publication, or visit the DOI to the publisher's website.• The final author version and the galley proof are versions of the publication after peer review.• The final published version features the final layout of the paper including the volume, issue and page numbers. Link to publication Citation for published version (APA):Garcia -Alonso, D., Serres, N., Demian, C., Costil, S., Langlade, C., & Coddet, C. (2011). Pre-/during-/post-laser processes to enhance the adhesion and mechanical properties of thermal sprayed coatings with a reduced environmental impact. Journal of Thermal Spray Technology, 20(4), 719-735. DOI: 10.1007/s11666-011-9629-x General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. Lasers have been used to improve the ultimate performance of thermal spray coatings for specific applications, but the full potential of additional laser treatments must be further explored. Laser treatments (auxiliary processes) can be applied before, during or after thermal spraying (main process), leading to a wide range of coating improvements (microstructure, adhesion, etc.). The aim of this review is to introduce the most significant laser treatments for thermal spray applications. The potential improvements for thermal spray coatings are illustrated by a selection of representative research cases. Laser pretreatments (ablation and texturing) promote coating/substrate adhesion and are suitable to prepare the surface of sensitive substrates such as aluminum, titanium, or magnesium alloys. The use of these techniques, which leads to several benefits such as surfaces free of grit-particle inclusions, directly improves the quality of coatings. Laser treatments applied simultaneously during the spraying process deeply modify the coatings microstructure. These hybrid technologies allow in situ laser melting of coatings, resu...

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Influence of substrate surface conditions on the plasma sprayed ceramic and metallic particles flattening

Cited by 52 publications

References 28 publications

Formation of Solid Splats During Thermal Spray Deposition

Formation of Solid Splats During Thermal Spray Deposition

Effects of Surface Chemistry on Splat Formation During Plasma Spraying

Pre-/During-/Post-Laser Processes to Enhance the Adhesion and Mechanical Properties of Thermal-Sprayed Coatings with a Reduced Environmental Impact

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