Specific Features of the Formation of Wear-Resistant Titanium-Carbide Coatings by the Method of Electrophoretic Depositi
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SPECIFIC FEATURES OF THE FORMATION OF WEAR-RESISTANT TITANIUMCARBIDE COATINGS BY THE METHOD OF ELECTROPHORETIC DEPOSITION H. А. Bahlyuk,1, 2 L. M. Apinins’ka,1 N. M. Verheles,1 N. O. Us’kova,1 and O. V. Bezdorozhev1
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We present the results of investigation of the possibilities of application of the method of electrophoretic deposition for the formation of the wear-resistant coatings based on titanium carbide and the dependence of the yield of deposits on the technological modes of the process. It is shown that adhesively strong titanium carbide coatings can be obtained on steel substrates by liquid-phase sintering of electrophoretic deposits under the condition that a nickel–phosphorus sublayer of the eutectic composition is added to the composition of the coating. Keywords: electrophoretic deposition, titanium carbide, sublayer, coating, electrolyte, suspension, sintering.
Recent advances in mechanical engineering are closely connected with the solution of the problem of significant increase in the reliability and service life of machines and mechanisms as a result of the development of contemporary structural materials capable of withstanding high loads and characterized by high wear resistance under different operating conditions. As one of efficient and cost-effective method for the solution of this problem, we can mention the formation of multifunctional protective coatings on the working surfaces of the components. These coatings undertake a part of functional properties of the component (wear resistance, contact strength, etc.) and, thus, decrease the requirements to the characteristics of the base material and the total cost of the entire component. Alloys based on carbides and borides of refractory metals belong to the group of the most promising wearresistant materials and are successfully used for the deposition of coatings [1]. The methods of thermochemical surface alloying guaranteeing the possibility of getting high-quality diffusion coatings are used especially extensively. At the same time, the methods and procedures used for the formation of coatings are also improved with the development of new materials. Thus, the method of electrophoretic deposition (EPD) characterized by the high productivity and constant thicknesses of the layers of coatings proves to be quite promising in this field of engineering [2–4]. The technology of electrophoretic deposition is based on the realization of a directed motion of solid particles suspended in a liquid under the action of electric fields in the case where certain conditions are satisfied. This leads to the formation of coatings with predicted compositions and properties. This method is efficient not only due to the universal technological possibilities of getting coatings from various materials and their combination on the surfaces of any complex shape but also due to the low cost of the technology, which does not require the use of complex equipment [2]. 1 2
Frantsevych Institute for Problems in Materials Science, Ukrainian Nationa
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