Modification of the Surfaces of Aluminum and Titanium Alloys Aimed at the Improvement of Their Wear Resistance and Tribological Characteristics.
In: Materials Science, Jg. 57 (2021-11-01), Heft 3, S. 377-386
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Zugriff:
We describe main achievements of the researchers from the Karpenko Physicomechanical Institute of the NAS of Ukraine in the field of formation of wear-resistant coatings and layers on aluminum and titanium alloys. The mechanisms of action of hydrogen, copper, and nickel on the synthesis of oxide-ceramic coatings in the process of plasma electrolytic oxidation (PEO) of aluminum alloys are established. We propose methods aimed at the intensification of synthesis, namely, by adding hydrogen peroxide and ozone to the electrolyte (to increase the oxygen content) and strengthening of the anodic current combined with weakening of the cathodic current, which leads to a decrease in the amount of hydrogen ions in the plasma channel. As a result of combination of these methods, the thickness of the PEO coatings would increase by 80% and the wear resistance would become 4–6 times higher. The metal-oxide composite layers based on corundum and containing copper or nickel inclusions are developed. The relationship between the sizes of metal inclusions and the energy of a separate discharge is established, which enables us to form nanosized copper and nickel inclusions. The influence of hydrogen formed as a result of decomposition of oil and water on the tribological behavior of "metal–PEO coating" contact couples is established, which enables one to make the friction coefficient of these tribocouples 5–20 times lower. The methods aimed at increasing the wear resistance of high-strength (α + β)-titanium alloys and, in particular, of VT22 alloy, are developed. For the first time, it was established that the original (α + β)-globular structure of VT22 alloy is most favorable for the process of gas nitriding. An approach to the intensification of gas nitriding based on the use of cold surface plastic deformation is also proposed. This enables one to lower the temperature and time parameters of nitriding and combine it with hardening thermal treatment of the alloy. It is shown that such a combined deformation-diffusion treatment provides higher tribotechnical characteristics of VT22 alloy. It is shown that the proposed combination of low-temperature oxynitriding with aging of VT22 alloy within a single technological cycle guarantees high fretting resistance of the analyzed alloy in a tribocouple with D16 alloy. [ABSTRACT FROM AUTHOR]
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Titel: |
Modification of the Surfaces of Aluminum and Titanium Alloys Aimed at the Improvement of Their Wear Resistance and Tribological Characteristics.
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Autor/in / Beteiligte Person: | Student, M. M. ; Pohrelyuk, I. M. |
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Zeitschrift: | Materials Science, Jg. 57 (2021-11-01), Heft 3, S. 377-386 |
Veröffentlichung: | 2021 |
Medientyp: | academicJournal |
ISSN: | 1068-820X (print) |
DOI: | 10.1007/s11003-021-00552-z |
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