Preparation and Characterization of NiCr/NiCr-Al2O3/Al2O3 Multilayer Gradient Coatings by Gas Detonation Spraying

Rakhadilov, Bauyrzhan; Буйткенов, Д.Б.; Sagdoldina, Zhuldyz; Idrisheva, Zhanat; Zhamanbayeva, Manira; Kakimzhanov, Dauir

doi:10.3390/coatings11121524

Cited by 4 publications

(5 citation statements)

References 20 publications

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“…A small number of pores and cracks are observed at the interface between the white, curved strips and the gray matrix. In [28,29], it is reported that the coatings obtained by detonation spraying have a wave-like porous structure. EDS analysis along the gradient-structured coating line showed that the light, curved bands consisted mainly of Ti, while the dark regions consisted mainly of Ti and O.…”

Section: Resultsmentioning

confidence: 99%

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Synthesis and Formation Mechanism of Metal Oxide Compounds

et al. 2022

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In this work, the influence of the technological parameters of the detonation method on the formation of metal oxide compounds on the basis of titanium was investigated. The aim of the work was to investigate the method of the effective control of the phase composition and microstructure of titanium-based coatings during detonation spraying. The main parameters that varied in detonation spraying were the volume of filling the detonation barrel with explosive mixture and the oxygen/fuel ratio. The mechanism of formation of the gradient structure of coatings based on metal oxide compounds depending on the technological parameters of detonation spraying was considered. The structural-phase states and tribological properties of detonation coatings were investigated by the following methods: X-ray phase analysis (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDX-mapping), profilometry, and the test for wear-resistance according to the “ball-disk” scheme. It is shown that the phase composition of coatings may significantly change relative to the initial titanium powder during the detonation spraying due to the interaction of particles of powders with components of the gas atmosphere. Varying the spraying parameters may control the chemical reaction and provide conditions for the synthesis of the desired phases in the coatings (titanium oxide TiO2 and Ti2O3).

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Section: Resultsmentioning

confidence: 99%

“…A small number of pores and cracks are observed at the interface between the white, curved strips and the gray matrix. In [28,29], it is reported that the coatings obtained by detonation spraying have a wave-like porous structure. Tribological tests of the coatings obtained under different regimes of detonation spraying were carried out.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and Formation Mechanism of Metal Oxide Compounds

et al. 2022

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“…Therefore, WC-Co-Cr coatings can be applied to pipeline valve parts using the HVOF process as a replacement for conventional hard chrome plating to extend the service life of gate valves [1,19]. WC-Co-Cr coatings can also be deposited using various spraying methods such as air plasma spraying (APS), vacuum plasma spraying (VPS), detonation spraying, arc spraying and flame spraying [20][21][22][23][24][25][26]. Among the above methods, the HVOF process is considered to be the most promising method, successfully providing solutions to many issues related to oxidation, wear resistance, hot corrosion and erosion [27].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Influence of Powder Fraction on Tribological and Corrosion Characteristics of 86WC-10Co-4Cr Coating Obtained by HVOF Method

Rakhadilov,

Muktanova,

Kakimzhanov

et al. 2024

Coatings

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Samples using powders of four different fractions, 15–20 μm, 20–30 μm, 30–40 μm and 40–45 μm, were fabricated to investigate the wear resistance, corrosion resistance and tribological properties of the 86WC-10Co-4Cr coating obtained using the HVOF method. The phase composition, microstructure and elemental distribution were analyzed using X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy techniques. The hardness was measured on a Vickers microhardness tester, the friction coefficient and wear rate were investigated using a tribometer, and the corrosion resistance was evaluated on an electrochemical corrosion station. The results showed that the cross-sectional microstructure of the coating is mainly represented by multifaceted WC crystals embedded in the Co-Cr matrix and the presence of lower tungsten carbides, particularly W2C. The 15–20 μm fraction particles were subjected to superheating, contributing to the decarburization process. The 20–30 µm and 30–40 µm sized particles prevented overheating and had a more homogeneous structure. The 40–45 µm powder fractions did not reach sufficient temperature for complete melting, resulting in the formation of pores in the coating layers. The phase composition of the coatings included WC, W2C and CoO phases. According to the results of the study, it was found that the optimal powder fraction for coating the 86WC-10Co-4Cr composition with improved characteristics is the fraction of the 20–30 µm sized particles.

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“…Detonation spraying is widely used to obtain gradient coatings [23][24][25]. Detonation spraying of gradient coatings is performed by alternating shots from two powder dispensers with diferent powders [22].…”

Section: Introductionmentioning

confidence: 99%

“…Terefore, we developed a method of obtaining composite gradient coatings by varying the spray parameters during spraying, i.e., after a certain number of shots, the technological modes (the barrel flling degree, gas ratio, etc.) change [22][23][24][25]. To implement this method, it is necessary to apply a detonation setup with a single powder dispenser flled with composite powder.…”

Section: Introductionmentioning

confidence: 99%

Influence of Spraying Parameters on the Structure and Tribological Properties of Cr3C2-NiCr Detonation Coatings

Rakhadilov

Kakimzhanov

Dautbekov

et al. 2023

Advances in Tribology

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In this work, the influence of spray parameters on the formation of the microstructure, phase composition, and the tribological properties of detonation flame sprayed coatings was studied. It was determined that the chemical composition of Cr3C2-NiCr coatings during detonation spraying depends on the degree of filling the barrel with an explosive gas mixture. The degree of filling the barrel with an explosive gas mixture at 73% leads to a decrease in the content of carbide phases, and at 57% filling of the barrel, an increase in carbide phases is observed. It is established that the decrease of the filling degree leads to the increase of hardness and wear resistance of the Cr3C2-NiCr coatings since the hardness and wear resistance of the coating material deposited at 57% is higher than at 65% and 73%; this is due to the increase in the carbide phase Cr3C2. Detonation flame sprayed Cr3C2-NiCr gradient coatings have been developed in this study, which is carried out by varying the spray parameters. It was found that in the gradient coating, Cr3C2-NiCr carbide phases gradually increase from the depth to the surface. The obtained gradient coating closer to the substrate consists of the CrNi3 phase, while the coating surface consists of CrNi3 and Cr3C2 phases.

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Preparation and Characterization of NiCr/NiCr-Al2O3/Al2O3 Multilayer Gradient Coatings by Gas Detonation Spraying

Cited by 4 publications

References 20 publications

Synthesis and Formation Mechanism of Metal Oxide Compounds

Synthesis and Formation Mechanism of Metal Oxide Compounds

Investigation of the Influence of Powder Fraction on Tribological and Corrosion Characteristics of 86WC-10Co-4Cr Coating Obtained by HVOF Method

Influence of Spraying Parameters on the Structure and Tribological Properties of Cr3C2-NiCr Detonation Coatings

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