Comparative Study of Structures and Properties of Detonation Coatings with α-Al2O3 and γ-Al2O3 Main Phases

Rakhadilov, Bauyrzhan; Kakimzhanov, Dauir; Baizhan, Daryn; Muslimanova, G.; Pazylbek, S.; Zhurerova, Laila

doi:10.3390/coatings11121566

Cited by 10 publications

(8 citation statements)

References 27 publications

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“…Consequently, the structural and phase characteristics of aluminum oxide coatings are significantly affected by the technological parameters of detonation spraying. Our previous studies [23][24][25] also confirmed that changes in parameters such as the explosion frequency and the volume filled with the gas mixture in the barrel lead to changes in the content of α-Al 2 O 3 and γ-Al 2 O 3 phases in the coatings. In our studies [23][24][25], we used α-Al 2 O 3 as a starting powder and investigated the effects of maximum parameters on a CCDS2000 detonation machine.…”

Section: Introductionsupporting

confidence: 58%

Tribological and Mechanical Properties of Gradient Coating on Al2O3-Based Coating Produced by Detonation Spraying Methods

Rakhadilov,

Kakimzhanov,

Buitkenov

et al. 2023

Advances in Tribology

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This work is aimed at obtaining gradient coating of aluminum oxide (Al2O3) by detonation spraying. The influence of technological parameters of spraying on the formation of structure, phase composition. mechanical, and tribological characteristics of Al2O3 coatings have been investigated. It was determined that coatings obtained from the same raw powder materials under different technological conditions show different structural and phase characteristics. X-ray diffraction analysis showed that when the barrel is filled with gas mixture by 56%, the coating with the main phase α-Al2O3 is formed, and when the barrel is filled with gas mixture by 63%, the coating with the main phase γ-Al2O3, which is relatively more ductile than α-Al2O3, is formed. It is determined that the α-Al2O3 formed mainly on the surface provides good wear resistance. The bottom layer composed of γ-Al2O3 phase, which is relatively more ductile than α-Al2O3, provides good adhesion of the coating to the substrate. Tribological study showed that the coating obtained at 56% of filling shows good wear resistance compared to other samples. At 63% of filling the results of scratch test showed good adhesive strength. By varying the technological mode of detonation sputtering (56%, 53%, and 63%), Al2O3 coating with gradient structure was obtained, in which γ-Al2O3 smoothly transitions to α-Al2O3 from the substrate to the surface. The hardness of the coatings was found to increase smoothly from substrate to surface (12.4–14.2 GPa).

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Section: Introductionsupporting

confidence: 58%

Tribological and Mechanical Properties of Gradient Coating on Al2O3-Based Coating Produced by Detonation Spraying Methods

Rakhadilov,

Kakimzhanov,

Buitkenov

et al. 2023

Advances in Tribology

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“…Composite HATi coatings with a thickness of about 60 μm were applied to a Ti6Al4V substrate using a CCDS2000 detonation complex (CCDS-2000, developed by Siberian Protective Coating Technologies LLC, Novosibirsk, Russia), the operation principle of which is described in detail in [20,21]. Detonation spraying is performed by feeding combustible and oxidizing gases (propane, oxygen) into the channel in a ratio close to stoichiometric.…”

Section: Methodsmentioning

confidence: 99%

Obtaining functional-gradient Ti-HA coatings by detonation spraying

Sagdoldina¹,

Baizhan²,

Kambarov³

et al. 2022

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Functional-gradient titanium/hydroxyapatite (TiHA) coatings were obtained using detonation spraying technology to improve the structure and mechanical properties. To obtain functional-gradient coatings, pulsed energy sources are best suited, namely, detonation spraying, in which the energy of the explosion of gas mixtures is used as a source of pulsed action. By controlling the modes of detonation spraying, it is possible to vary the temperature and rate of coating deposition; accordingly, it is possible to obtain a certain structuralphase structure of the coatings. The structural-phase state and tribological properties of TiHA detonation coatings were investigated by modern materials science methods: X-ray phase analysis (XRD), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDX-mapping), profilometry and ball-disk wear-resistance test. The results showed that the coatings had a continuously gradient elemental composition across the cross-section of the coatings with no boundary between the elemental layers of the coatings. The amount of Ti gradually decreased and the amount of hydroxyapatite gradually increased in the direction from the substrate to the surface of the coatings, which allows to expand the possibilities of using TiHA-coatings for bone implants. Since the surface layer is composed of HA, the resulting functional-gradient coating demonstrates excellent biocompatibility and the ability to create new bone tissue. The excellent mechanical strength of the functionally graded coatings is ensured by the Ti phase.

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“…Obviously, the nature of detonation spraying-interaction with gaseous products of an exothermic chemical reaction-is close to flame spraying. However, in contrast to it, there is no strong heating of the part, which is related to the pulse character of the detonation spraying process [12].…”

Section: Introductionmentioning

confidence: 99%

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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Comparative Study of Structures and Properties of Detonation Coatings with α-Al2O3 and γ-Al2O3 Main Phases

Cited by 10 publications

References 27 publications

Tribological and Mechanical Properties of Gradient Coating on Al2O3-Based Coating Produced by Detonation Spraying Methods

Tribological and Mechanical Properties of Gradient Coating on Al2O3-Based Coating Produced by Detonation Spraying Methods

Obtaining functional-gradient Ti-HA coatings by detonation spraying

Synthesis and Formation Mechanism of Metal Oxide Compounds

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