Microstructure, Adhesion, and Erosion Wear of Plasma Sprayed Alumina-TitaniaComposite Coatings

Mishra, Subash Chandra; Sahu, Anupama; Das, Rojaleena; Satapathy, Alok; Sen, Sudipta; Ananthapadmanabhan, P.V.; Sreekumar, K.

doi:10.1177/0731684407087758

Cited by 10 publications

(6 citation statements)

References 10 publications

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“…It is known that impingement angle is one of the most important parameters in the erosion process and for ductile materials the peak erosion normally occurs at 15-20 • angle, whereas for brittle materials the erosion damage is maximum usually at normal impact; that is, at 90 • impingement angle (Mishra,et al (14), (27); Satapathy (28); Bayer (29)). In the present study, the variation of erosion wear rate of the fly ash-aluminum coatings with impingement angle was studied by conducting experiments under specified operating conditions.…”

Section: Erosion Test Results and Taguchi Analysismentioning

confidence: 96%

Tribo-Performance Analysis of Fly Ash–Aluminum Coatings Using Experimental Design and ANN

Sahu

Satapathy

Mishra

et al. 2010

Tribology Transactions

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This article proposes the application of an artificial neural network (ANN) to a Taguchi orthogonal experiment to develop a robust and efficient method of analyzing and predicting the solid particle erosion wear response of a new class of metal-ceramic coatings. An ANN model based on data obtained from experiments performs self-learning by updating weightings and repeated learning epochs. In this work, plasma-sprayed coatings of fly ash premixed with aluminum powder in different weight proportions are deposited on aluminum substrates at various input power levels of the plasma torch. Erosion wear characteristics of these coatings are investigated following a plan of experiments based on the Taguchi technique, which is used to acquire the erosion test data in a controlled way. The study reveals that the impact velocity is the most significant among various factors influencing the wear rate of these coatings. An ANN approach is then implemented taking into account training and test procedure to predict the tribo-performance under different erosive wear conditions. This technique helps in saving time and resources for a large number of experimental trials and successfully predicts the wear rate of the coatings both within and beyond the experimental domain.

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Section: Erosion Test Results and Taguchi Analysismentioning

confidence: 96%

Tribo-Performance Analysis of Fly Ash–Aluminum Coatings Using Experimental Design and ANN

Sahu

Satapathy

Mishra

et al. 2010

Tribology Transactions

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“…Расширение сферы применения методов газотермического напыления привело к развитию порошковой металлургии и разработке новых композиционных порошковых материалов [1][2][3]. В последнее десятилетие на российском рынке поставщиками качественных порошковых смесей были зарубежные фирмы.…”

Section: Introductionunclassified

Structure and Strength Properties of Plasma Coating Obtained From Powdered Material of Zirconium Dioxide Clad With Nickel

Tsareva

Berdnik

Krivina

et al. 2022

PSP

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The problem of increasing the adhesive strength of plasma powder coatings by introducing a metal bundle from a new composite powder of domestic production into them has been solved. Synthesis of composite powder material is carried out by the method of cladding matrix ceramic particles with a metal component. The results of studies of a new powder material of the composition (ZrO2+8%Y2O3) with a granular composition of 40/80 microns obtained by chemical cladding of zirconium dioxide particles with a nickel shell (30 wt.%), as well as the coating formed from it. The regularities of the formation of an experimental coating from this powder material with a spherical particle shape have been studied using electron microscopy and X-ray diffraction analysis. It is established that a coating with a two-phase composition (T-ZrO2+Ni) is formed during high-energy plasma spraying. In cross-section, the coating is a composite structure consisting of zirconium dioxide grains with nickel interlayers. The coating is characterized by an average hardness of HV(medium) ~ 7,6 GPa and a surface roughness of Ra(medium) ~ 6,12 microns. When micro-indenting, the coating does not show fragility. The scratch test method was used as the main method for studying the strength properties of the coating. During sclerometry, a predominantly cohesive mechanism of coating destruction was established. The destruction occurs by a cohesive mechanism with a violation of the bonds in a thin surface layer and is accompanied by chipping of the microfragments of the coating. The critical load of the beginning of the formation of microcracks (Rs) ~ 10 N and the beginning of the formation of chevron microcracks (Rt) ~ 45 N were determined. The high adhesive strength of the adhesion of the investigated coating to the substrate is shown, since during the tests there is no detachment from the substrate up to the maximum load (200 N). The developed ceramic coating is promising for protection against mechanical and erosive wear of critical parts of power engineering working at elevated temperatures.

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“…La diversité des revêtements utilisés pour les pièces usées continue de faire l'objet d'une recherche intense sur leur caractérisation tribologique et électrochimique [4][5][6][7][8][9]. Les dépôts à base Ni [10][11][12] sont des candidats excellents pour des applications anti-usure et anticorrosion [13][14][15][16][17]. Cependant, l'optimisation des applications demande une meilleure compréhension des phénomènes intervenant au cours de la technique de projection thermique, de façon à améliorer la fiabilité et la durabilité des lamelles projetées [18][19][20][21].…”

Section: Introductionunclassified

“…Des mesures de microduretés, sous une charge de 200 g, ont été également réalisées sur la surface de ces dépôts. Six efforts normaux de contact (5,10,15,20,30 et 40 N) et deux vitesses de glissement 0,5 et 0,1 m/s ont été retenus pour cette étude pendant une durée de 30 minutes moyennant le tribomètre pion-disque en vue de déterminer l'influence de la vitesse sur le taux d'usure des différents dépôts réalisés.…”

Section: Introductionunclassified

Influence des post-traitements sur la résistance à l’usure des dépôts en superalliage Ni-Cr-Al-Mo obtenus par projection thermique

Younes

Bradai

Sadeddine

et al. 2018

Matériaux & Techniques

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Ce travail porte sur la caractérisation microstructurale, structurale et mécanique des dépôts métalliques à base Nickel déposés sous forme de poudres par la technique de projection thermique flammepoudre sur un substrat type E335. Pour améliorer les propriétés de ces dépôts, des traitements thermiques sont préconisés en vue d'homogénéiser ces derniers et permettre d'obtenir de meilleures propriétés mécaniques. Ces post-traitements ont été réalisés à différentes températures 400, 600 et 800°C avec un temps de maintien d'une heure et un refroidissement à l'air. La caractérisation structurale et microstructurale de la poudre et des dépôts est obtenue en utilisant le microscope électronique à balayage (MEB) et la diffraction X (DRX). Des relevés de micro duretés Vickers ont été également réalisés sur la surface de ces dépôts. Les essais tribologiques ont été réalisés avec une configuration pion-disque à différentes charges avec deux vitesses de glissement en vue de déterminer le taux d'usure. Les observations microstructurales ont montré que les traitements effectués aux températures de 400 et 600°C ont réduit les porosités en rendant les microstructures plus homogènes et plus denses par le phénomène de colmatage. Par contre, le traitement à 800°C a présenté un délaminage au niveau de l'interface substrat/dépôt. Les résultats d'usure ont révélé que la vitesse de glissement et la pression de contact appliquée influent sur la variation du taux d'usure et que les dépôts traités à 400°C présentent une meilleure résistance à l'usure que ceux traités à 600 et 800°C.Mots clés : projection thermique / dépôts / post-traitement / microstructure / usure Abstract. Effect of heat treatment on tribological behavior of superalloys Ni-Cr-Al-Mo coatings obtained by thermal spraying. The purpose of this work is to produce metallic coatings, in powder form on nickel-based onto a steel type E335 by the technique flame spraying. To improve the properties of these coatings, post-treatments are recommended in order to homogenize them and allow obtaining better mechanical properties. These coatings were subjected to post-treatments at different temperatures 400, 600, 800°C and maintained for 1 hour and cooled in air. The structural and microstructural characterization of the powder and coatings is obtained using the scanning electron microscope (SEM) and X-ray diffraction (XRD). Measures micro hardness was also performed on the surface of the coatings. The tribological tests were carried out with a pin-disk configuration under different load, with two sliding velocities in order to determine the wear rate. The microstructural results showed that the treatments carried out at temperatures of 400 and 600°C present a homogeneous lamellar morphology, denser and more compact and reduced the porosities by the clogging phenomenon. Otherwise, the post-treatment at 800°C caused a delamination at the interface substrate / coating. The tribological test results revealed that the sliding velocity and the applied load influenced the variation of wear ra...

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Microstructure, Adhesion, and Erosion Wear of Plasma Sprayed Alumina-TitaniaComposite Coatings

Cited by 10 publications

References 10 publications

Tribo-Performance Analysis of Fly Ash–Aluminum Coatings Using Experimental Design and ANN

Tribo-Performance Analysis of Fly Ash–Aluminum Coatings Using Experimental Design and ANN

Structure and Strength Properties of Plasma Coating Obtained From Powdered Material of Zirconium Dioxide Clad With Nickel

Influence des post-traitements sur la résistance à l’usure des dépôts en superalliage Ni-Cr-Al-Mo obtenus par projection thermique

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