Visn. Nac. Akad. Nauk Ukr. 2018. (3):79-84 

V.M. Gvozdecki
Karpenko Physico-Mechanical Institute of the National Academy of Sciences of Ukraine, Lviv

According to the materials of scientific report at the meeting of the Presidium of NAS of Ukraine, December 13, 2017

Electro-arc coatings, moderately doped with chromium, aluminum and silicon, have high heat resistance. The formation of oxide films Cr2O3, Al2O3 and SiO2 on their surface significantly reduces the oxidation rate. At elevated temperatures there is a synergistic effect of the action of erosion wear and oxidation of surfaces of parts, while oxides are destroyed by fast particles of fuel. The coatings provide the main characteristics of materials at elevated temperatures — heat resistance and high-temperature strength. The extraction of the dispersed phases of nanometer sizes provides the microhardness of the coatings at 450–500 HV. The electric arc coating from the powder wire X6B3Al14 has the highest resistance to gas-abrasive wear under operating conditions.
Keywords: spraying, electric arc coatings, powder wires, lamellae, oxidation, oxide films.

Language of article: ukrainian


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