Developing technology of creating wear-resistant ceramic coating for internal combustion engine cylinder sleeve

Chavdarov, Anatoliy V.; Denisov, Viatcheslav A.

doi:10.5377/nexo.v34i04.12689

Cited by 4 publications

(5 citation statements)

References 10 publications

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“…The most cost-effective is hardening by microplasma electrolytic oxidation of friction surfaces of friction pairs: plain bearings, gears, pulleys, sliding guides, mechanical seals for internal combustion engines, etc. [1,3,[5][6][7][8]. It has been found that the modification of the units of the cylinder-piston group results in an increase in wear resistance by a factor of 10-15 [5].…”

Section: Main Applications Of Microplasma Electrolytic Oxidation Tech...mentioning

confidence: 99%

“…Modification by microplasma electrolytic oxidation of aluminum parts to protect them from aggressive environments: chemically active solutions, seawater, extreme weather conditions, etc. [3,9,10,18]. It was found in [19] that, at temperatures up to 870°C, MAO coatings on titanium alloy Ti-6Al−4V 45-50 µm thick, retained high adhesion to the substrate and surface density without signs of pitting.…”

Section: Main Applications Of Microplasma Electrolytic Oxidation Tech...mentioning

confidence: 99%

“…The oxidation process consists in the formation of a hardened ceramic layer under the action of high stress on the surface of metals with the strongly marked valve properties (Al, Mg, Ti, Zr, Nb, Ta, Be and alloys based on them). The technology of microplasma modification of the surface of parts is in demand for the modification of tribounits in the machine building, oil and gas industry, instrument making, radio electronics, transport, aviation and space, and other industries [1][2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

“…The characteristics of the materials formed in the electrolyte plasma are determined by the combination of physical and mechanical parameters of the base materials, transitional and working ceramic layer. The properties and structure of the oxide ceramic layer, in turn, are determined by the electrical modes of material formation, the chemical composition of the electrolyte, and the possible further modification of the ceramic matrix with micro-and nanosized tribofillers [3,4,10]. As a result of the universality of the technology, it is possible to obtain composite ceramic coatings and materials characterized by high tribomechanical, electrical insulating, and thermophysical properties.…”

Section: Introductionmentioning

confidence: 99%

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Application features of microarc oxidation technology

2023

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The technology of microarc oxidation of valve metals is one of the promising methods for engineering the working surface of friction units of modern technology. As a result of the versatility of the technology, it is possible to obtain composite ceramic coatings and materials of various types. Their properties are set by the electrical modes of material formation, the chemical composition of the electrolyte, and the possible further modification of the ceramic matrix with micro- and nanosized tribofillers. Based on the practical results of their research in the field of creating coatings of various types by microarc oxidation, an analysis is given of the main areas of application of microplasma electrolytic oxidation technology, their advantages over other methods of surface modification, structure and properties of the materials obtained. It is possible to distinguish the modification of the friction surface of a part by the method of microplasma electrolytic oxidation in order to increase its hardness and wear resistance. Good results were obtained in increasing the wear resistance of the hardened working surface of the spinning machine parts, the number of equipment repairs was reduced by more than 20 times. The use of microarc oxidation is promising for the preparation of composite coatings, which are a ceramic matrix in which solid lubricating dispersed particles are embedded. The technology of forming a matrix on aluminum, modified with dispersed magnetite, graphite and molybdenum disulfide, has been developed. According to the results of comparative tribotechnical tests, it was found that the intensity of linear wear of the material filled with MoS2 is 3 times, and Fe3O4 - 1.6 times lower than that of the coatings without filler. Based on the technology of microplasma electrolytic oxidation, an original technology has been developed for obtaining mineral-ceramic material, which is a matrix of aluminum oxide and dispersed diamond inclusions. Abrasive wheels made from this material have a consistently high volumetric cutting ability, 1.5-3.5 times higher than the traditional analogues and are characterized by high diamond retention. The possibilities of microplasma oxidation have not yet been fully explored, the most promising direction being the creation of nanostructured coatings for a specific technological task.

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Section: Main Applications Of Microplasma Electrolytic Oxidation Tech...mentioning

confidence: 99%

Section: Main Applications Of Microplasma Electrolytic Oxidation Tech...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Application features of microarc oxidation technology

2023

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“…Most emergency situations involve creating maps based on contamination due to nuclear fallout and pinpointing the position or specific location for lost radioactive sources. In order to solve large geological and environmental problems, an introduction to data processing using modern computers was made thus attaining a higher rate of achieving success in solving geological problems [3]. Many people are unaware that radioactivity is present in this world naturally.…”

mentioning

confidence: 99%

Measurements of Terrestrial Gamma Dose Rate Distributions along Idiroko Road, Ota, Ogun State, Nigeria: Health Implications on Roadside Dwellers

Omeje,

Chijuo,

Okafor

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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An extensive study concerning the terrestrial gamma dose rates of the surface soils from Canaanland entrance Road, Ota to Eleha Complex along Idiroko Road, Ota has been carried out to cover the road running across both areas. The In-situ measurements of gamma dose rates and radionuclides were carried out using the Gamma detector (Super Spec RS 125). The result shows that the average outdoor gamma dose rate in the study area is 73.57 nGyh−1. The average values of the radionuclides obtained were 32.9 Bq/kg for 238U, 68.4 Bq/kg for 232Th, and 328.7 Bq/kg for 40K. The background dose rate of 113.3 nGy/h was found in station 9 and is twice higher than the recommended permissible limit of 59 nGy/h suggested by UNCSEAR, 2000, and ICRP, 1999, respectively. Results were obtained based on radiological parameters for the outdoor absorbed dose rate (Dout) with a mean value of 73.57 nGyh−1, the indoor absorbed dose rate (Din) with a mean value of 131.84 nGyh−1, the annual effective dose rate (AEDR) with a mean value of 0.74, the radium equivalent (Raeq) with a mean value of 156.0, the internal hazard index (Hin) with a mean value of 0.51, the external hazard index (Hex) with a mean value of 0.42 and the excess lifetime cancer risk (ELCR) with a mean value of 2.57. Similarly, results obtained from estimated radiological parameters show that the station with the highest value for radium equivalent (Raeq), external hazard index (Hex), internal hazard index (Hin), and annual effective dose rate (AEDR) is Station 9 at 237.91 Bq/Kg, 0.64, 0.72 and 1.13 mSvy−1 respectively while the station with the lowest value for radium equivalent (Raeq), external hazard index (Hex), internal hazard index (Hin) and annual effective dose rate (AEDR) is Station 17 at 85.58 Bq/Kg, 0.23, 0.27 and 0.40 mSvy−1 respectively. This study will serve as a guide on assessing the road construction materials on radioactive contents before application to reduce the exposure risks to the populace along the busy roadsides.

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