The microstructure of composite cermet coatings produced by carbo-vibroarc surfacing

Technology of Reconditioning with Hardening of Working Elements of Construction and Road Machines by Composite Coatings

“…Preliminary the carried out investigations allowed to establish that each of the component of the metal ceramic paste for the CVAH considerably influences on the thickness and the physical and mechanical properties of the obtained with this method composite coating [8,9,13,14,15]. As a matrix of the metal ceramic pastes, we used the powder PR-NX17СР4 TU 14-22-33-90, produced by «Polema» (Tula).…”

“…The ceramic components content in the paste composition was changed from 10 to 30%. The content of cryolite Na3AlF6 GOST 10561 in all pastes composition was 10% [14][15][16]. The metal ceramic paste was prepared by mechanical mixture of the above-mentioned components with addition of a binding agent (water solution of glue PVA, then it was applied on the metal base from steel 65G and was dried until hardening.…”

“…For the CVAH we used installation VGDU-2, developed and manufactured by Federal State Budgetary Scientific Institution, Federal National Agricultural Center of All-Russian Engineering Institute (Moscow). The installation contains the inverter thyristor current source of 200…250 А, operating console and vibrator with embodied in it carbon electrode of diameter 6…8 mm [9,11,14,15]. During installation work between carbon electrode and hardened surface with the paste deposited layer, electric arc was ignited, as the result the composite coating was formed from the paste elements on the hardened surface.…”

Theoretical background for the creation of wear-resistant coatings at the carbo-vibro-arc hardening

“…During formation of metal-ceramic coatings by the CVAH method a multicomponent paste was used containing RI ɉɊ-ɇɏɋɊ SRZGHU, 30% of boron carbide, and the restcryolite. In connection with the widespread use of aqueous PVA glue solution in the CVAH coating formation processes, this solution was selected as a binder in these studies [8,9,11,12,14].…”

“…Then, after the paste polymerization, it is melted using a vibrating carbon electrode. The process of metal-ceramic coating formation with high physical and mechanical properties and tribotechnical characteristics is realized due to electric arc combustion [8][9][10][11][12][13][14].…”