Influence of Detonation-Spraying Parameters on the Phase Composition and Tribological Properties of Al2O3 Coatings

Kantay, Nurgamit; Rakhadilov, Bauyrzhan; Kurbanbekov, Sherzod; Yeskermessov, Didar; Yerbolatova, Gulnara; Apsezhanova, Akbota

doi:10.3390/coatings11070793

Cited by 17 publications

(5 citation statements)

References 29 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: 60%

“…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. We found that as the blast frequency decreases, the α-Al 2 O 3 content of the coatings increases.…”

Section: Introductionsupporting

confidence: 60%

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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: 60%

Section: Introductionsupporting

confidence: 60%

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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“…Our earlier studies [22][23][24] also showed that when changing the technological modes (firing frequency, barrel filling volume) of detonation spraying, the ratio of the α-Al 2 O 3 and γ-Al 2 O 3 phases changes. In these studies [22][23][24], α-Al 2 O 3 was used as the initial powder, and the maximum possible parameters (frequency of firing and barrel filling) of the CCDS-2000 detonation unit were studied using an acetylene-oxygen mixture. It was found that with a decrease in the frequency of the shot, as well as with a decrease in the volume of filling the barrel with an acetylene-oxygen mixture, α-Al 2 O 3 increases.…”

Section: Introductionmentioning

confidence: 83%

“…Therefore, the structural and phase states of aluminium oxide coatings strongly depend on the technological mode of detonation spraying [22]. Our earlier studies [22][23][24] also showed that when changing the technological modes (firing frequency, barrel filling volume) of detonation spraying, the ratio of the α-Al 2 O 3 and γ-Al 2 O 3 phases changes. In these studies [22][23][24], α-Al 2 O 3 was used as the initial powder, and the maximum possible parameters (frequency of firing and barrel filling) of the CCDS-2000 detonation unit were studied using an acetylene-oxygen mixture.…”

Section: Introductionmentioning

confidence: 84%

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

et al. 2021

Self Cite

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This study is aimed at obtaining a coating of aluminum oxide containing α-Al2O3 as the main phase by detonation spraying, as well as a comparative study of the structural, tribological and mechanical properties of coatings with the main phases of α-Al2O3 and γ-Al2O3. It was experimentally revealed for the first time that the use of propane as a combustible gas and the optimization of the technological regime of detonation spraying leads to the formation of an aluminum oxide coating containing α-Al2O3 as the main phase. Tribological tests have shown that the coating with the main phase of α-Al2O3 has a low value of wear volume and coefficient of friction in comparison with the coating with the main phase of γ-Al2O3. It was also determined that the microhardness of the coating with the main phase of α-Al2O3 is 25% higher than that of the coatings with the main phase of γ-Al2O3. Erosion resistance tests have shown (evaluated by weight loss) that the coating with α-Al2O3 phase is erosion-resistant compared to the coating with γ-Al2O3 (seen by erosion craters). However, the coating with the main phase of γ-Al2O3 has a high value of adhesion strength, which is 2 times higher than that of the coating with the main phase of α-Al2O3. As the destruction of coatings by the primary phase, α-Al2O3 began at low loads than the coating with the main phase γ-Al2O3. The results obtained provide the prerequisites for the creation of wear-resistant, hard and durable layered coatings, in which the lower layer has the main phase of γ-Al2O3, and the upper layer has the main phase of α-Al2O3.

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“…This process can lead to undesirable overheating or melting of particles and a significant increase in the substrate temperature, which limits their effective application. The DS method utilizes a pulsed regime of operation [19]. On the one hand, this provides an opportunity to reduce the above negative effects.…”

Section: Introductionmentioning

confidence: 99%

Study of the Structural-Phase State of Hydroxyapatite Coatings Obtained by Detonation Spraying at Different O2/C2H2 Ratios

Baizhan,

Sagdoldina,

Buitkenov

et al. 2023

Crystals

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This work studies the influence of the composition of an acetylene–oxygen explosive O2/C2H2 mixture on the structure and properties of hydroxyapatite coatings obtained by detonation spraying. The molar ratios of O2/C2H2 were 2.61; 3.03 and 3.35; the explosive charge was between 73 and 77%. The results of X-ray phase analysis showed partial conversion of the hydroxyapatite (HA) phase to the tricalcium phosphate (α-TCP) phase and formation of the amorphous phase during detonation sputtering. The formation of a small amount of the α-TCP phase during detonation spraying of HA is obviously due to structural transformations occurring during the heating of the material by detonation products. In addition, very rapid cooling of molten particles leads to the formation of the amorphous phase. The study results of the microstructure of the cross sections of the formed coatings, conducted using scanning electron microscopy, indicate that an increase in the O2/C2H2 ratio leads to increased porosity in the coatings. Additionally, an increase in the explosive charge by 77% results in the appearance of transverse cracks in the coating.

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Influence of Detonation-Spraying Parameters on the Phase Composition and Tribological Properties of Al2O3 Coatings

Cited by 17 publications

References 29 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

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

Study of the Structural-Phase State of Hydroxyapatite Coatings Obtained by Detonation Spraying at Different O2/C2H2 Ratios

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