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, [e-mail]

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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__at_mail.ru
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Modification of engineering parts

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

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PART 1 Nanostructured TiNC coatings
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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 610-3 Pa
  during the coating synthesis.

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Structure of TiNC coating, synthesized by
pulsed-arc method
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Raman spectroscopy study of TiNC coatings
Optical modes
G mode
Acoustical modes
D mode
Carbon
TiN
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Tribotechnical properties of TiN-C coatings
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Applications
measuring tools
simmerings
plunger pairs of high-pressure fuel pumps
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PART 2Electrofriction Discharge Hardening (EDH)
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Electrofriction Discharge Hardening Scheme
1 - rotating tool, 2 - water, 3 - sample, 4 -
zone of discharge
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The setups allow hardeningflat surfaces
Experimental Setup Parameters Value
Maximum discharge power, kW 7,5
Tool rotation frequency, min-1 1 - 200
Linear speed, m/min 0.05 - 10
The size of the processed part, mm maximum length maximum width maximum depth 500 225 50
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Structure and microhardness with thickness of
the modified layer of 65? steel (65Mn)
HV
EDH current - 250 A
The distance from the surface, mm
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Structure and microhardness with thickness of
the modified layer of 35???? steel (35CrMnSi)
HV
EDH current - 200 A
The distance from the surface, mm
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Structure of surface layers of ??100 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
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Hardened chisel-like plowshares (Kverneland)
Hardened cartridge of cutters for rock
fracturing
Hardened zone
The lifetime of the hardened plowshares
increased by 76 ha in sandy loam soils
Hardened zone
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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.

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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__at_mail.ru