Obrabotka Metallov. 2016 no. 2(71)

ОБРАБОТКА МЕТАЛЛОВ № 2 (71) 2016 68 МАТЕРИАЛОВЕДЕНИЕ OBRABOTKAMETALLOV (METAL WORKING AND MATERIAL SCIENCE) N 2 (71), April – June 2016, Pages 59–69 The kinetics of formation of coatings based on titanium carbide during diffusion metallization from the fusible liquid metal solutions, on the hard alloys Sokolov A.G., D.Sc. (Engineering), Professor, e-mail: Sag-51@bk.ru Bobylyov E.E., Ph.D. student, e-mail: ebobylev@mail.ru Kuban State Technological University, 2 Moskovskaya st., Krasnodar, 350072, Russian Federation Abstract The analysis of the strengths and weaknesses of existing technologies to improve the performance properties of carbide cutting tool is given. The results of studies of the diffusion metallization process by titanium of hard alloys from the fusible liquid-metal solutions are given. The influence of titanium diffusion coatings on the durability of carbide tools is investigated. Amethod of providing formation on hard alloys for wear-resistant titanium high-quality functional coatings is described. The thickness of the coating varies depending on the temperature and exposure time, and ranges from 2.6 to 5.6 µm in the alloys of type TC; from 2 to 5.4 µm on alloys of the type VK. The hardness of the coatings obtained depends on the temperature of the coating and modes of pre-carburizing, and varies from 24100 to 30000 MPa for alloys of type TK; 21580 up to 24750 MPa for alloys of the type VK. The kinetics of formation of diffusion coatings on titanium carbide is investigated. The microstructure of the coatings is investigated. The coating consists of two layers: the coating and the transition zone, which size and hardness depends on the conditions of pre-carburization and modes of application of the coating. The dependence of the thickness of the coatings from the exposure time of the plates in the melt, the temperature of coating composition from the coated hard alloy is investigated. It is revealed that the coatings formed on the TK-type alloy have greater thickness and hardness, then coatings on the VK-type alloys. Keywords titaniumdiffusion coatings, hardmetals, properties of the coatings, kinetics of coating formation, pre-carburization, tool life. DOI: 10.17212/1994-6309-2016-2-59-69 References 1. Il’in A.A., Stroganov G.B., Skvortsova S.V. Pokrytiya razlichnogo naznacheniya dlya metallicheskikh mate- rialov [Coatings of various purposes for metallic materials]. Moscow, Al’fa-M Publ., INFRA-M Publ., 2013. 144 p. 2. Kozyreva L.V. [Chemical vapor deposition as a method of obtaining of nanostructured materials]. Materialy 12 Mezhdunarodnoi nauchno-prakticheskoi konferentsii “Resursosberegayushchie tekhnologii remonta, vosstanov- leniya i uprochneniya detalei mashin, mekhanizmov, oborudovaniya, instrumenta i tekhnologicheskoi osnastki ot nano- do makrourovnya” [Proceedings of the 12 th International Scientific and Practical Conference “Resource-saving technology of repair, restoration and strengthening of machine parts, machinery, equipment, tools and tooling from the nano- to the macro level”]. St. Petersburg, 2010, pt. 2, pp. 174–178. (In Russian) 3. Lakhtin Yu.M., Arzamasov B.N. Khimiko-termicheskaya obrabotka metallov [Chemical heat treatment of met- als]. Moscow, Metallurgiya Publ., 1985. 256 p. 4. DeBenedetti B., Grassini S., Maffia L. Comparison between eco-profiles of innovative PA-CVD and tradi- tional galvanic coatings. Proceedings of International Conference on Materials for Advanced Technologies “IC- MAT 2005” , Singapore, 2005, pp. 1–4. 5. Vereshchaka A.S., Tret’yakov I.P. Rabotosposobnost’ rezhushchego instrumenta s iznosostoikimi pokrytiyami [Performance of cutting tool with wear-resistant coatings]. Moscow, Mashinostroenie Publ., 1993. 336 p. 6. Mattox D.M. Handbook of physical vapor deposition (PVD) processing: film formation, adhesion, surface preparation and contamination control . Westwood, NJ, Noyes Publ., 1998. 917 p. ISBN 0-8155-1422-0. eIS- BN 1-5912-4079-4