Effect of plasma spray distance on the features and hardness reliability of YSZ thermal barrier coating

Abbas, Ruqaya Abdulkadhim; Ajeel, Sami A.; Bash, Maryam A. Ali; Kadhim, Mohammed Jasim

doi:10.1016/j.matpr.2020.12.578

Cited by 18 publications

(11 citation statements)

References 20 publications

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“…The alumina surface is composed of a larger number of fully melted particles in the presence of a splat formation, resulting in lower surface roughness [9,13]. R. A. Abbas et al [16] observed that the surface roughness increased with an increase in spray distance due to non-melted or insufficiently melted particles. T. Ghara et al [9] observed that an increase in particle velocity from 197 to 219 m/s reduced the porosity and roughness values.…”

Section: Resultsmentioning

confidence: 99%

“…V. C Misra et al [13] demonstrated that the increase in plasma input power from 12 to 20 kW reduced the porosity of Al 2 O 3 coatings from 16 to 9% and increased the amount of metastable γ-Al 2 O 3 phase in as-sprayed alumina coatings. R. A. Abbas et al [16] observed that the surface roughness increased as spray distance increased from 70 to 130 mm. Plasma torch power is considered to be one of the most effective ways to increase the velocity and temperature of the plasma jet.…”

Section: Introductionmentioning

confidence: 97%

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Influence of Plasma Torch Power on the Plasma Jet Properties and Microstructure of Alumina Coatings

et al. 2022

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In this study, alumina coatings were formed using atmospheric plasma spraying, increasing the torch power from 29.4 to 45.1 kW. The surface morphology of the coatings was determined using scanning electron microscopy; the elemental composition was examined using energy-dispersive X-ray spectroscopy (EDS); phase composition was investigated using X-ray diffraction; and surface roughness was determined using a profilometer. The steel surface temperature was measured using a type-K thermocouple, and the plasma jet temperature, at a distance of 70 mm, using a type-B thermocouple. Alumina particle velocity was calculated by analyzing high-speed camera footage using ImageJ software. The results indicate that plasma jet temperature, speed, and in-flight particle velocity increased with plasma torch power. Furthermore, the amount of γ-Al2O3 phase in the coating increased, and the α-Al2O3 decreased with increasing plasma power. The surface roughness (Rq) of the Al2O3 coatings decreased from 7.13 to 5.54 μm, with an increase in torch power. The EDS measurements indicate that the increase in torch power did not affect the elemental composition of as-sprayed coatings. The results provide a wider understanding of an atmospheric plasma spray technique, optimizing and controlling the parameters using air as a primary gas.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 97%

Influence of Plasma Torch Power on the Plasma Jet Properties and Microstructure of Alumina Coatings

et al. 2022

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“…In [8], heating (200-400 °C) of steel the metallizer nozzle to the base surface; this ensures the formation of the optimal size of liquid metal particles, minimizes their oxidation and promotes the formation of strengthening phases ((NiTi, Ni 3 Ti, Ti 2 Ni, and TiO), which increase the mechanical adhesion of the coating to the base. A similar approach was used in [11], devoted to the study of YSZ Also, the adhesion strength of metal gas-flame coatings is effectively increased by the use of vacuum post-heat treatment [3] However, the listed methods of increasing the adhesion strength significantly complicate the spraying process, require the use of specific equipment and highly qualified personnel.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Determination of adhesion of the coating deposited by arc spraying with pulsation of atomizing air flow

Zakharova

2021

EEJET

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During electric arc spraying, during the transfer of molten metal by air flow, there is a significant burnout of alloying elements with the formation of a large amount of oxides, which negatively affects the adhesion of the coating to the base. A solution to the problem of increasing the adhesion strength by using pulsation of the atomizing air flow is proposed. At the optimal frequency of the pulsed flow shut-off, the time of formation of liquid metal droplets at the ends of the electrodes coincides with the frequency of pulses of the spraying flow. As a result, the droplets acquire an optimal size, they are transported by an air flow with conservation of energy, a lower mass of oxygen and, as a consequence, a significant decrease in the oxidation of alloying elements in the sprayed material. The existing test methods of sprayed coatings for adhesion strength to the base are analyzed. The design of a modernized device for determining the adhesion strength is developed and described, which provides complex loading of the coating with a combination of tear-off and shear. The tests revealed a significant (up to two times) increase in the adhesion strength of aluminum, zinc-aluminum and steel (Sv08A) coatings applied with air pulsation. This is achieved by increasing the number of fusion zones of the coating particles between themselves and with the base. It is shown that the effect of the pulsation frequency on the adhesion strength changes along a curve with a maximum corresponding to a frequency of 70–80 Hz, regardless of the coating material. It has been established that the aluminum coating has an increased tendency to oxidation, as a result of which it is 15–20 % inferior to the zinc-aluminum coating in adhesion strength. The data obtained substantiate the use of the proposed spraying technology in production

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“… 28 This low homogeneity can be avoided by adjusting the spray angle along the thermal spray, which can affect the thermal properties and adhesion between one layer and another, resulting in increased thermal resistance. 29 High-velocity oxygen fuel (HVOF) is a thermal spray process in which feedstock material is sprayed after passing through the combustion chamber and flowing through a nozzle, with the raw material being liquid. 30 The use of flame spraying has an advantage when compared to other thermal spraying methods, such as a more even distribution process due to particle spraying on the substrate at low speeds, where a low speed can produce high homogeneity, which can improve adhesion capacity.…”

Section: Introductionmentioning

confidence: 99%

Morphological and mechanical studies of Al₂O₃–Na₂SiO₃ as a skin barrier coated with TiO₂ for carbon fiber reinforced composite materials

Widyastuti,

Hardiyanti,

Muhaqqi Al Haq

et al. 2024

RSC Adv.

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Effect of plasma spray distance on the features and hardness reliability of YSZ thermal barrier coating

Cited by 18 publications

References 20 publications

Influence of Plasma Torch Power on the Plasma Jet Properties and Microstructure of Alumina Coatings

Influence of Plasma Torch Power on the Plasma Jet Properties and Microstructure of Alumina Coatings

Determination of adhesion of the coating deposited by arc spraying with pulsation of atomizing air flow

Morphological and mechanical studies of Al₂O₃–Na₂SiO₃ as a skin barrier coated with TiO₂ for carbon fiber reinforced composite materials

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Effect of plasma spray distance on the features and hardness reliability of YSZ thermal barrier coating

Cited by 18 publications

References 20 publications

Influence of Plasma Torch Power on the Plasma Jet Properties and Microstructure of Alumina Coatings

Influence of Plasma Torch Power on the Plasma Jet Properties and Microstructure of Alumina Coatings

Determination of adhesion of the coating deposited by arc spraying with pulsation of atomizing air flow

Morphological and mechanical studies of Al2O3–Na2SiO3 as a skin barrier coated with TiO2 for carbon fiber reinforced composite materials

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Morphological and mechanical studies of Al₂O₃–Na₂SiO₃ as a skin barrier coated with TiO₂ for carbon fiber reinforced composite materials