The Microstructure and Selected Mechanical Properties of Al2O3 + 13 wt % TiO2 Plasma Sprayed Coatings

Michalak, Monika; Łatka, Leszek; Sokołowski, Paweł; Niemiec, A.; Ambroziak, Andrzej

doi:10.3390/coatings10020173

Cited by 25 publications

(20 citation statements)

References 33 publications

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“…3-5. The top-view of the coatings indicates their lamellar microstructure and the presence of unmelted powder particles, porosity, and oxides that are typical of thermally sprayed coatings [36,52,53]. According to the XRD analysis results, the coatings A and B form a γ solid solution with the structure of fcc and phases β-(Co,Ni)Al and Cr3Ni, which is in agreement with the data reported in the literature [32,52].…”

Section: Coating Characterizationsupporting

confidence: 88%

“…Samples were cutting in order to obtain cross-sections, and it has been prepared by the standard metallographic procedure (impregnate into the resin, then grinding with abrasive papers and polishing with diamond suspension). Hardness was measured on the metallographic cross-sections with a nano-hardness tester (Anton Paar CSM Instruments) having a load of 500 mN accordingly to the reference [36].…”

Section: Materials Investigationmentioning

confidence: 99%

“…Besides, in comparison to other thermal spraying processes, e.g., plasma spraying or flame spraying, HVOF-deposited coatings exhibit low porosity and crack density, and therefore have a homogeneous structure. This is mainly due to the low thermal stresses, relatively low process temperature, and the high speed of the particles being sprayed [34][35][36]. It is well known that the homogeneous structure of the material has a positive effect on its resistance to cavitation erosion.…”

Section: Introductionmentioning

confidence: 99%

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Cavitation Erosion and Sliding Wear of MCrAlY and NiCrMo Coatings Deposited by HVOF Thermal Spraying

Szala

Walczak

Łatka

et al. 2020

Advances in Materials Science

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AbstractThe investigation into wear resistance is an up-to-date problem from the point of view of both scientific and engineering practice. In this study, HVOF coatings such as MCrAlY (CoNiCrAlY and NiCoCrAlY) and NiCrMo were deposited on AISI 310 (X15CrNi25-20) stainless steel substrates. The microstructural properties and surface morphology of the as-sprayed coatings were examined. Cavitation erosion tests were conducted using the vibratory method in accordance with the ASTM G32 standard. Sliding wear was examined with the use of a ball-on-disc tribometer, and friction coefficients were measured. The sliding and cavitation wear mechanisms were identified with the SEM-EDS method. In comparison to the NiCrMo coating, the MCrAlY coatings have lower wear resistance. The cavitation erosion resistance of the as-sprayed M(Co,Ni)CrAlY coatings is almost two times lower than that of the as-sprayed NiCrMoFeCo deposit. Moreover, the sliding wear resistance increases with increasing the nickel content as follows: CoNiCrAlY < NiCoCrAlY < NiCrMoFeCo. The mean friction coefficient of CoNiCrAlY coating equals of 0.873, which almost 50% exceed those reported for coating NiCrMoFeCo of 0.573. The as-sprayed NiCrMoFeCo coating presents superior sliding wear and cavitation erosion resistance to the as-sprayed MCrAlY (CoNiCrAlY and NiCoCrAlY) coatings.

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Section: Coating Characterizationsupporting

confidence: 88%

Section: Materials Investigationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cavitation Erosion and Sliding Wear of MCrAlY and NiCrMo Coatings Deposited by HVOF Thermal Spraying

Szala

Walczak

Łatka

et al. 2020

Advances in Materials Science

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“…The surface morphology of the coatings is presented in Figures 1 and 2. The top-view of the coatings indicates their lamellar microstructure and the presence of unmelted powder particles, porosity and oxides that are typical of thermally sprayed coatings [14,31,32]. According to the XRD analysis results, the coatings A and B form a γ solid solution with the structure of fcc and phases β-(Co,Ni)Al and Cr3Ni.…”

Section: Coating Characterizationmentioning

confidence: 99%

Resistance to Cavitation Erosion and the Sliding Wear of MCrAlY and NiCrMo Metallic Coatings

Szala

Walczak

Łatka

et al. 2020

2nd Coatings and Interfaces Web Conference (CIWC-2 2020)

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Bulk cobalt- and nickel-based metallic materials exhibit superior resistance to cavitation erosion and sliding wear. Thus, thermally deposited High-Velocity Oxygen Fuel (HVOF) coatings seem promising for increasing the wear resistance of the bulk metal substrate. However, the effect of chemical composition on the cavitation erosion and sliding wear resistance of M(Co,Ni)CrAlY and NiCrMo coatings has not yet been exhaustively studied. In this study, High-Velocity Oxygen Fuel (HVOF) coatings such as CoNiCrAlY, NiCoCrAlY, and NiCrMoFeCo were deposited on AISI 310 (X15CrNi25-20) steel coupons. The microstructure, hardness, phase composition and surface morphology of the as-sprayed coatings were examined. Cavitation erosion tests were conducted using the vibratory method in accordance with the ASTM G32 standard. Sliding wear was examined with the use of a ball-on-disc tribometer, and friction coefficients were measured. The mechanism of wear was identified with the scanning electron microscope equipped with an energy dispersive spectroscopy (SEM-EDS) method. In comparison to the NiCrMoFeCo coating, the CoNiCrAlY and NiCoCrAlY coatings have a lower sliding and cavitation wear resistance.

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“…A detailed description of APS as well as additional information about this technique can be found e.g. in [9,10].…”

Section: Introductionmentioning

confidence: 99%

Neural Modelling of APS Thermal Spray Process Parameters for Optimising the Hardness, Porosity and Cavitation Erosion Resistance of Al2O3 -13% TiO2 Coatings

Szala¹,

Łatka²,

Awtoniuk³

et al. 2020

Preprint

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The study aims to elaborate a neural model and algorithm for optimising hardness and porosity of coatings and thus ensure that they have superior cavitation erosion resistance. Al2O3-13wt.%TiO2 ceramic coatings were deposited onto 316L stainless steel by atmospheric plasma spray (ASP). The coatings were prepared with different values of two spray process parameters: the stand-off distance and torch velocity. Microstructure, porosity and microhardness of the coatings were examined. Cavitation erosion tests were conducted in compliance with the ASTM G32 standard. Artificial neural networks (ANN) were employed to elaborate the model, and the multi-objectives genetic algorithm (MOGA) was used to optimise both properties and cavitation erosion resistance of the coatings. Results were analysed with Matlab software by Neural Network Toolbox and Global Optimization Toolbox. The fusion of artificial intelligence methods (ANN+MOGA) is essential for future selection of thermal spray process parameters, especially for the design of ceramic coatings with specified functional properties. Selection of these parameters is a multicriteria decision problem. The proposed method made it possible to find a Pareto front, i.e. trade-offs between several conflicting objectives – maximising the hardness and cavitation erosion resistance of Al2O3-13%TiO2 coatings and, at the same time, minimizing their porosity.

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The Microstructure and Selected Mechanical Properties of Al2O3 + 13 wt % TiO2 Plasma Sprayed Coatings

Cited by 25 publications

References 33 publications

Cavitation Erosion and Sliding Wear of MCrAlY and NiCrMo Coatings Deposited by HVOF Thermal Spraying

Cavitation Erosion and Sliding Wear of MCrAlY and NiCrMo Coatings Deposited by HVOF Thermal Spraying

Resistance to Cavitation Erosion and the Sliding Wear of MCrAlY and NiCrMo Metallic Coatings

Neural Modelling of APS Thermal Spray Process Parameters for Optimising the Hardness, Porosity and Cavitation Erosion Resistance of Al<sub>2</sub>O<sub>3</sub> -13% TiO<sub>2</sub> Coatings

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