THEORETICAL AND EXPERIMENTAL INVESTIGATION OF MULTILAYER (TiAlSiY)N/CrN COATING BEFORE AND AFTER GOLD IONS IMPLANTATION

Maksakova, O. V.; Pogrebnjak, A.D.; Buranich, Vladimir; Иващенко, В. И.; Baimoldanova, Lazat S.; Rokosz, Krzysztof; Raaen, S.; Malovana, Nina

doi:10.1615/hightempmatproc.2021038087

Cited by 4 publications

(1 citation statement)

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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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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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Influence of Mechanical Activation on the Evolution of TiSiCN Powders for Reactive Plasma Spraying

Baimoldanova,

Rakhadilov,

Kengesbekov

et al. 2024

Crystals

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In modern materials science and surface engineering, reactive plasma spraying (RPS) holds a key position due to its ability to create high-quality coatings with unique properties. The effectiveness of this process is largely determined by the physicochemical characteristics of the initial powder materials. This study examines the effects of mechanical activation for two compositions in the TiSiCN system and their impact on the quality and performance characteristics of RPS-produced coatings. It is shown that mechanical activation induces significant changes in the crystalline structure of the powders, reducing their particle size and increasing their specific surface area, thereby enhancing the reactivity of the materials during mechanochemical reactions. These changes contribute to the formation of dense and durable coatings with improved hardness and thermal stability. Thermogravimetric analysis (TGA) results confirm that the powders retain stable thermal properties and exhibit resistance to oxidation and decomposition. X-ray structural analysis reveals multiphase structures, including TiC, SiC, and TiCN, with the TiCN phase playing a key role in ensuring coating hardness. Additionally, SEM analysis showed that the TiSiCN-2-2 coating possesses a denser and more homogeneous structure with minimal pores and microcracks, providing superior mechanical strength and wear resistance compared to TiSiCN-1-2. Cross-sectional micrographs further revealed that the TiCN + Si coating has a greater average thickness (39.87 μm) and more uniform distribution compared to Ti + SiC (35.48 μm), indicating better application control and a more homogeneous material structure. Mechanical activation significantly influences the properties of powders, allowing for the determination of optimal parameters for RPS, which is a highly efficient method for creating coatings with unique performance characteristics.

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Electrolyte-plasma surface hardening of hollow steel applicator needles for point injection of liquid mineral fertilizers

Rakhadilov,

Bayandinova,

Kussainov

et al. 2024

AIMSMATES

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<abstract> <p>This paper presents the results of research on the effect of electrolyte-plasma hardening on tribological and mechanical properties of hollow needles of 12Kh18N10Т steel applicators for liquid fertilizer application. For the application of liquid fertilizers for processing and testing, the hollow needles of the applicator are made of 12Kh18N10Т steel of cylindrical shape with a diameter of 20 mm. To ensure uniformity of the hardening process, the part was rotated clockwise during the entire procedural cycle. To reveal the influence of the sample rotation speed on the uniform surface hardening, an experiment was conducted for three applicators with rotation speeds of 4, 6, and 8 rev/min. As a result of electrolyte-plasma surface hardening (EPSH), the phase composition of the specimen's surface is characterized by the presence of austenite (γ-Fe) and ferrite (α-Fe). It is revealed that the maximum value of microhardness after EPSH is 2 times higher than the initial value. According to the results of the performed works, the contract on application of tests in field conditions and revealing of perspectivity of needle applicators for liquid fertilizers application was concluded.</p> </abstract>

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THEORETICAL AND EXPERIMENTAL INVESTIGATION OF MULTILAYER (TiAlSiY)N/CrN COATING BEFORE AND AFTER GOLD IONS IMPLANTATION

Cited by 4 publications

References 0 publications

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

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

Influence of Mechanical Activation on the Evolution of TiSiCN Powders for Reactive Plasma Spraying

Electrolyte-plasma surface hardening of hollow steel applicator needles for point injection of liquid mineral fertilizers

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