Advanced materials and approaches in electrospark deposition
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KUDRYASHOV, A., ZAMULAEVA, E., POGOZHEV, Yu., MANAKOVA, O., DORONIN, O., LEVASHOV, A.. Advanced materials and approaches in electrospark deposition. In: Materials Science and Condensed Matter Physics, Ed. 7, 16-19 septembrie 2014, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2014, Editia 7, p. 291.
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Materials Science and Condensed Matter Physics
Editia 7, 2014
Conferința "Materials Science and Condensed Matter Physics"
7, Chișinău, Moldova, 16-19 septembrie 2014

Advanced materials and approaches in electrospark deposition


Pag. 291-291

Kudryashov A., Zamulaeva E., Pogozhev Yu., Manakova O., Doronin O., Levashov A.
 
National University of Science and Technology MISiS, Moscow
 
Proiecte:
 
Disponibil în IBN: 18 martie 2019


Rezumat

In this communication we will overview some achievements of the Scientific-Educational Center MISiS–ISMAN (affiliated at MISiS since 1989) in the field of electrospark deposition (ESD).   Our commercialized electrode materials can be subdivided into the following three groups:  (1) Electrode materials for ESD produced by self-propagating high-temperature synthesis (SHS). Such materials (of STIM brand) represent metal-matrix (or intermetallic-matrix) materials containing 10-60% refractory particles (TiC, TiB2, TaC, Cr3C2). Addition of nanopowders (ZrO2, Al2O3, NbC, Si3N4, W, WC, WC–Co, Mo–Al2O3, diamond) in amounts of up to 7% markedly improved the service parameters of deposited ESD coatings. Another approach is based on simultaneous utilization of dispersion strengthening and precipitation of surplus phases (such as MeVC or MeV) in carbide grains and metal matrix (e.g. g'-phases). In this way, we managed to fabricate such electrode materials as (Ti,Nb)C, (Ti,Zr)C, and (Ti,Ta)C whose metal matrix also contained 10-60% Ni–Co–Al–Cr, Ni–Al or Ni to improve the service parameters of deposited coatings. For deposition of heat-resistant coatings, we designed and manufactured electrode materials based on Сr–Al–B–Si, Mo–Si–B, Cr–Al–B, and МАХ phases in the Ti–Cr–Al–C system.   (2) Sintered nanostructured materials (of SNM brand) fabricated from WC–Co nanopowders by vacuum sintering or hot pressing.   (3) Materials for thermoreactive electrospark surface strengthening (TRESS process). The TRESS process combines ESD with chemical reaction in discharge plasma.   ESD of die tools with STIM electrodes was found to increase their service life by a factor two. The deposition process was mechanized by using disk-shaped SHS-produced electrodes. In case of large rollers, we used home-made equipment with a vibrating holder and eight generators of pulsed current. ESD resulted in a 4-fold increase in the service life of thus processed rollers. ESD of a Ni-based face seal in rocket engines also gave good results: the mounting withstood two engine start-ups. When deposited onto the flange surface in an aero-machine, the coating of STIM-3BVn (TiC–Cr3C2–Ni–Wnano) imparted a higher wear resistance as compared to that of conventionally used T15K6 coating.   Further improvement in service parameters of ESD coatings (friction coefficient, wear resistance) can be achieved by performing the deposition process in two stages: first deposition of hard alloys and then, of carbon-containing materials to improve tribological behavior. The latter can be also attained by deposing solid lubricants (WSe2, MoS2).   The above strengthening processes and synthesized electrode materials have already been tested on an industrial scale and implemented at several plants.