A comparative study of three adhesion tests (EN 582, similar to ASTM C633, LASAT (LASer Adhesion Test), and bulge and blister test) performed on plasma sprayed copper deposited on aluminium 2017 substrates

Арригони, М.; Barradas, Sophie; Braccini, M.; Dupeux, M.; Jeandin, Michel; Boustie, M.; Bolis, C.; Berthe, Laurent

doi:10.1163/156856106777144336

Cited by 38 publications

(17 citation statements)

References 19 publications

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“…Indeed, such high stress levels are induced by a dynamic shockwave but only driven during a few nanoseconds if compared to a nearly static test like is the pull‐out test. Nevertheless, it has been stated that the LASAT could be compared with a good agreement to other adhesion tests applied to thermal spray coatings 22. In such measuring range, a standard error was estimated to be around 0.7 kJ m −2 (or 0.01 GW cm −2 ) that corresponded to a ±15 MPa deviation on the calculated maximum stress.…”

Section: Resultsmentioning

confidence: 78%

“…More recent works on such thick metallic or ceramic coatings obtained by CVD,16 thermal spraying,17–20 and cold spraying,21 ascertained that such laser technique could be applied to measure the interface strength of various thick, porous, and rough coating systems. A comparative study has been completed in the case of half‐millimeter thick plasma‐sprayed copper coatings onto Al‐based substrate by Arrigoni et al22 The LASAT was compared to the tensile adhesion test, namely pull‐out test (ASTM C633) and also to the “bulge and blister” test. The discrimination and ranking of the different adhesion levels were checked to be all in keeping.…”

Section: Introductionmentioning

confidence: 99%

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Bond strength determination of hydroxyapatite coatings on Ti‐6Al‐4V substrates using the LAser Shock Adhesion Test (LASAT)

Guipont¹,

Jeandin²,

Bansard³

et al. 2010

J Biomedical Materials Res

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An adhesion test procedure applied to plasma-sprayed hydroxyapatite (HA) coatings to measure the "LASAT threshold" (LAser Shock Adhesion test) is described. The good repeatability and minimal discrepancy of the laser-driven adhesion test data were ascertained for conventional plasma sprayed HA coatings. As a further demonstration, the procedure was applied to HA coatings with diverse characteristics on the ceramic/metal interface. Different preheating and grit blasting conditions and the presence of a thick plasma-sprayed Ti sublayer or a thin TiO(2) layer prepared by oxidation were investigated through LASAT. It was assessed that a rough surface can significantly improve the coating's bond strength. However, it was also demonstrated that a thin TiO(2) layer on a smooth Ti-6Al-4V substrate can have a major influence on adhesion as well. Preheating up to 270°C just prior to the first HA spraying pass had no effect on the adhesion strength. Further development of the procedure was done to achieve an in situ LASAT with in vitro conditions applied on HA coatings. To that end, different crystalline HA contents were soaked in simulated body fluid (SBF). Beyond the demonstration of the capability of this laser-driven adhesion test devoted to HA coatings in dry or liquid environment, the present study provided empirical information on pertinent processing characteristics that could strengthen or weaken the HA/Ti-6Al-4V bond.

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Section: Resultsmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Bond strength determination of hydroxyapatite coatings on Ti‐6Al‐4V substrates using the LAser Shock Adhesion Test (LASAT)

Guipont¹,

Jeandin²,

Bansard³

et al. 2010

J Biomedical Materials Res

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“…), [27]- [29], more intensive studies are required for process optimisation, [30] and to define correlations between process parameters, coating composition and the microstructure obtained [31], [32], physical and mechanical properties of coatings, including bonding interface properties [33], coating thickness and the achieved coating adherence strength. Different qualitative or quantitative methods allow assessing the adhesion strength of thermally sprayed coatings [34]- [36], e.g. scratching test, tensile test, shear test, LASer adhesion test, bulge and blister test, interfacial indentation test and three-point bend test.…”

Section: Introductionmentioning

confidence: 99%

Influence of HVOF deposition thickness on adhesion strength of WC–CrC–Ni coatings

Murariu

Perianu

2019

Adv.Tech&Mat.

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In this paper, adhesion strength of WC–CrC–Ni coatings obtained by HVOF thermal spraying process of WOKA7504 powder has been studied in correlation with deposition thickness, chemical and structural properties. Besides the parameters strictly related to the process, deposition thickness was found to be the most significant factor affecting the adhesion strength. In the frame of experimental program 304L stainless steel and S235JR structural steel were used as substrate. Mechanical tests, SEM and EDX analysis, have been performed in order to assess structural and mechanical properties, phase composition of the deposited layers. Maximum average adhesion strength has been experimentally found of 23.4 N/mm2 for stainless steel and of 35.8 N/mm2 for structural steel, for a deposition thickness of 220 µm, achieved in two layers. Once the coatings’ thickness increases, the adhesion strength decreases constantly and over thickness of 400 to 650 µm, the existing coating imperfections and elongated carbides placed in the interlayer interface area could fail due to the thermal stresses during the HVOF thermal spraying process, since they are brittle stress concentrators and thus leading tocracking of coatings at small loads, since the coating layershave high hardness of 990 to 1151 HV 1.

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“…In the Laser Shockwave Technique (LST), initially developed for determining adhesion of thin films and coatings to substrates [8][9][10][11][12][13][14][15][16][17], a high-energy pulsed laser generates a compressive shock wave at the upper surface of a test sample. The compressive shock traverses the specimen.…”

Section: Introductionmentioning

confidence: 99%

Use of the Hugoniot elastic limit in laser shockwave experiments to relate velocity measurements

Smith¹,

Lacy²,

Lévesque³

et al. 2016

AIP Conference Proceedings

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Compressive strength measurements in aluminum for shock compression over the stress range of Journal of Applied Physics 98, 033524 (2005) Abstract. The US National Nuclear Security Agency has a Global Threat Reduction Initiative (GTRI) with the goal of reducing the worldwide use of high-enriched uranium (HEU). A salient component of that initiative is the conversion of research reactors from HEU to low enriched uranium (LEU) fuels. An innovative fuel is being developed to replace HEU in high-power research reactors. The new LEU fuel is a monolithic fuel made from a U-Mo alloy foil encapsulated in Al-6061 cladding. In order to support the fuel qualification process, the Laser Shockwave Technique (LST) is being developed to characterize the clad-clad and fuel-clad interface strengths in fresh and irradiated fuel plates. This fuel-cladding interface qualification will ensure the survivability of the fuel plates in the harsh reactor environment even under abnormal operating conditions. One of the concerns of the project is the difficulty of calibrating and standardizing the laser shock technique. An analytical study under development and experimental testing supports the hypothesis that the Hugoniot Elastic Limit (HEL) in materials can be a robust and simple benchmark to compare stresses generated by different laser shock systems.

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A comparative study of three adhesion tests (EN 582, similar to ASTM C633, LASAT (LASer Adhesion Test), and bulge and blister test) performed on plasma sprayed copper deposited on aluminium 2017 substrates

Cited by 38 publications

References 19 publications

Bond strength determination of hydroxyapatite coatings on Ti‐6Al‐4V substrates using the LAser Shock Adhesion Test (LASAT)

Bond strength determination of hydroxyapatite coatings on Ti‐6Al‐4V substrates using the LAser Shock Adhesion Test (LASAT)

Influence of HVOF deposition thickness on adhesion strength of WC–CrC–Ni coatings

Use of the Hugoniot elastic limit in laser shockwave experiments to relate velocity measurements

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