An increase in life times of products with gas-dynamic spray coatings

Архипов, В. Е.; Londarskii, A. F.; Москвитин, Г. В.; Mel'shanov, A. F.; Pugachev, M. S.

doi:10.3103/s1052618813060022

Cited by 5 publications

(2 citation statements)

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“…Within this concept, an important place is occupied by the development and research of new coatings that provide specified tribological surface properties. One of the promising techniques for effectively applying tribological coatings based on aluminum matrices is cold gas dynamic spraying [1][2][3][4][5][6][7][8]. However, gas-dynamic spraying of powders with a particle size smaller than 2 μm is difficult due to their deceleration in a compressed layer that occurs when a supersonic gas flow impinges on an obstacle.…”

Section: Introductionmentioning

confidence: 99%

Fabrication and characterization of aluminum-based powders multi-reinforced with nano- and microparticles

Aborkin,

Babin,

Bokaryov

2023

E3S Web Conf.

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Multi-reinforced powders were obtained by high-energy ball milling in a planetary mill. The process of obtaining heterogeneous powders consisted of two stages. At the first stage, a nanocomposite powder of AlMg6 + 0.3 wt.% C60 was obtained. In the second stage, 10, 30, 50, and 70 wt.% Al2O3 were added to the obtained nanocomposite powder and processing continued. Methods such as scanning electron microscopy, X-ray diffraction, and particle size analysis were used to characterize the obtained powders. It is shown that after the first stage of processing, the particles of the composite powder are characterized by an irregular shape. C60 reinforcing particles in the form of nanosized agglomerates were fixed on the surface of aluminum powder particles. After the second stage of processing, the particle size of the powder mixture decreased from 17.8 to 12.3 μm, while the proportion of Al2O3 particles increased from 10% to 70% by weight. It is shown that the synthesized heterogeneous powders were a mechanical mixture consisting of complex composition agglomerates and micro-sized ceramic particles. Complex composition agglomerates were formed from nanocrystalline matrix material particles and C60, and also with Al2O3 microparticles embedded in them, as well as located on the surface. The concentration of Al2O3 particles on the surface and inside the agglomerates increased with increasing weight fraction of ceramic particles in the mixture. It has been found that the introduction of 10-70 wt. % Al2O3 into the powder mixture increases the microhardness of the powder particles by approximately 16-23%. The resulting multi-reinforced powder mixtures can be utilized for coating deposition using the cold gas dynamic spraying method.

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Section: Introductionmentioning

confidence: 99%

Fabrication and characterization of aluminum-based powders multi-reinforced with nano- and microparticles

Aborkin,

Babin,

Bokaryov

2023

E3S Web Conf.

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“…Technologies of coating application of various functional purposes are widely used to improve the physical and mechanical characteristics of the surface of parts, products and structures, such as breaking strength under the influence of a corrosion medium [1][2][3][4][5][6][7][8][9]. The most important characteristic of coating, which determines the ability to resist breaking on operation under the influence of tangential and normal loads, is the cohesive strength (cohesion) of the applied metal layer.…”

Section: Introductionmentioning

confidence: 99%

Evaluation Methods of Cohesive Strength of Coatings

Arkhipov

Pugachev

2020

MSF

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Based on the test results of the coatings applied by gas-dynamic deposition, the paper evaluates the possibility of using the “pin” and “ring separation” methods to examine the cohesive strength of coatings on tensile test. There is a limitation of the “pin” method application for coatings with porosity due to a significant scatter in results (≤50%). Using the method of the “ring separation” with a high reliability of the results (scatter ≤5%) makes it possible to evaluate the effect of technological parameters of deposition, as well as changes in the phase composition of the coating on cohesion. For example, the cohesive strength of the aluminum coating decreases from ≈180 MPa to ≈50 MPa with rising deposition temperature from 180°C to 540°C; a sharp drop in cohesion of the applied metal layer from 78 MPa to 44 MPa is observed for the coating based on copper and zinc particles on formation of βʹ - and γ phases.

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