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Modification of engineering parts

Vacuum-plasma, plasma methods of surface modification of engineering parts Victor Kazachenko, PhD, Associate professor Laboratory of Surface Physics and Thin Films, Belarusian State University of Transport, Gomel 246653, Belarus, kvp_@mail.ru. Modification of engineering parts.

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Modification of engineering parts

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  1. Vacuum-plasma, plasma methods of surface modification of engineering partsVictor Kazachenko, PhD, Associate professorLaboratory of Surface Physics and Thin Films, Belarusian State University of Transport, Gomel 246653, Belarus, kvp_@mail.ru

  2. Modification of engineering parts • PART 1Deposition of nanostructured TiN+C coatings from pulsed cathodic-arc plasma discharge in vacuum • PART 2Electrofriction Discharge Hardening (EDH) of engineering parts operating under the conditions of abrasive wear

  3. PART 1 Nanostructured TiN+C coatings

  4. Pulsed cathodic arc carbon plasma source • The cathode is made of titanium. • The arc ignition system and additional anode are made of graphite. • The pressure of nitrogen is about 6·10-3 Pa during the coating synthesis.

  5. Structure of TiN+C coating, synthesized by pulsed-arc method AFM 3D AFM phase AFM topography 5 m 2 m SEM image of TiN coating SEM image of TiN+C coating

  6. Raman spectroscopy study of TiN+C coatings Optical modes G mode Acoustical modes D mode TiN Carbon

  7. Tribotechnical properties of TiN-C coatings

  8. Applications measuring tools simmerings plunger pairs of high-pressure fuel pumps

  9. PART 2Electrofriction Discharge Hardening (EDH)

  10. Electrofriction Discharge Hardening Scheme 1 - rotating tool, 2 - water, 3 - sample, 4 - zone of discharge

  11. The setups allow hardeningflat surfaces

  12. Structure and microhardness with thickness of the modified layer of 65Г steel (65Mn) HV EDH current - 250 A The distance from the surface, mm

  13. Structure and microhardness with thickness of the modified layer of 35ХГСАsteel (35CrMnSi) HV EDH current - 200 A The distance from the surface, mm

  14. Structure of surface layers of ВЧ100 cast iron (ISO 900-2) Quasi ledeburite Microhardness – up to 1000 HV Graphitic inclusions are preserved Martensite and residual austenite Microhardness – 800-850 HV Gradual transition to the pristinecast iron structure 100x 500x

  15. Hardened cartridge of cutters for rock fracturing Hardened chisel-like plowshares (“Kverneland”) Hardened zone The lifetime of the hardened plowshares increased by 76 ha in sandy loam soils Hardened zone

  16. Conclusion • In comparison with conventional TiN coatings, the nanocomposite layers of TiN containing carbon demonstrate lower roughness, less defects, significantly lower coefficient of friction and high wear resistance • Electrofriction discharge hardening (EDH) method allows hardening layers up to 3.5 mm deep without significant heating of the part. The method does not use expensive welding materials. Hardened layers exhibit the abrasive wear rate up to 5 times lower than the pristine material. The EDH is characterized by high productivity, low-cost equipment and easy automation. The EDH is suitable for hardening the soil processing and rock fracturing tools in agriculture and mining machinery.

  17. Thank You!We are looking forward to successful cooperation. Victor Kazachenko, PhD, Associate professor Laboratory of Surface Physics and Thin Films, Belarusian State University of Transport, Gomel 246653, Belarus, kvp_@mail.ru

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