Program: RELANSIN
Contract Nr.237/2006; Project type: P-CD
Project code: TEHMEC
Period: 27 months (July 2006 – September 2008)
Project
Title: Advanced technologies for development of antifriction,
ecological metal-carbon layers
Project Director: Dr. Cristian P. LUNGU
Coordinator: National
Institute of Laser, Plasma and Radiation Physics (INFLPR), Bucuresti-Magurele
Partners:
Partner 1 |
“Politehnica”
University, (CESIT) Bucuresti, (UPB), www.omtr.pub.ro/ |
|
Project
Responsible: Prof. Dr. Andrei TUDOR |
Partner 2 |
National Institute for
Aerospace Research "Elie Carafoli" (INCAS), Bucuresti, www.incas.ro |
|
Project
Responsible: Ing. Gheorghe IONESCU |
Partner 3 |
Research and Development Institute for Gas Turbine COMOTI , Bucuresti, www.comoti.ro |
|
Project Responsible:
Ing. Daniela BUZESCU |
Partner 4 |
SC
PLASMAJET SRL, Magurele, Jud. Ilfov |
|
Project
Responsible: Ing. Dacia TRUSCA |
Partner 5 |
Bucharest
University (UNIV. BUC), Physics Department, Bucuresti, www.unibuc.ro |
|
Project Responsible: Professor Dr. Ion
GRUIA |
Partner 6 |
University
„Ovidius” Constanta (UNIV.OVIDIUS), www.univ-ovidius.ro |
|
Project Responsible: Professor Rodica
VLADOIU |
The achievent of a new technology concerning nanostructured Metal-Carbon
film depositions, besides the development of knowledge in the field of
mechanical microsistems, opens a wide area of applications with beneficial
effects in economy by the possibility of the development of a new cathegory of
devices with low friction and increased wear resistance like plain bearings used
at high compression engines and moving parts of the machine elements.
The research will try to obtain some
performance parameters higher than that obtained by clasical devices. Those
parameters will be studied experimentally in order to be optimized by
fabrication of similar composite structures on planar substrates as well as on
cylindrical substrates used in industry.
The proposed original deposition method,
called TVA (Thermionic Vacuum Arc) already used successfully in Romania by the
group proposing this project, is to achieve the carbon (or metal) film
deposition by mean of plasma running in the pure vapors of the element (carbon
or metal). The vapors are resulting by the intense bombardment of graphite (or
metal) anode with the electrons emitted by the cathode, made buy a thick W
filament externally heated by a current supply. The potential of plasma
produced by this way can be adjusted between 50 – 500 V. One can obtain
energetic ions of the material to be deposited in order to improve the
structural quality of the films.
Simultaneous depositions of carbon, soft or
refractory metals (Ag, Cu, Mo, Ti, Nb, W, etc.) will be prepared by running two
TVA discharges (one in C and another in one of the metals) in order to obtain a
thick film (over one μm thickness) with low stress and good adherence on
substrate. A comparison will be made with silver-graphite coatings prepared by
plasma spray. The support will be given by the medium size entreprise PLASMA
JET ensuring the usage of plasma spray machine.
Proposed
targets/dead lines
Study of the existent TVA
solutions on international level. Analysis of the tribological
test methods for the antifriction layers manufacture. Simulation using the
finite element analysis software. |
30.11.2006 |
Elaboration of a model for
the deposition of antifriction layers using the TVA method for applications
in automotive industry. The deposition of antifriction layers using TVA
method |
10.06.2007 |
Design of the experimental devices (specialized TVA guns for each material type) for the in vacuum simultaneous evaporation of carbon and a metal (Ag, Cu, Al).Experimental device design (TVA guns)/ Specification for manufacturing the experimental device of carbon-metal evaporation. Manufacturing the experimental device. |
10.04.2008 |
Laboratory experiments for
optimization of the antifriction coatings on flat and semicilindric bearings
using carbon-soft metals (Ag, Cu, Sn, Al) |
15.12.2007 |
Optimization of the vacuum
arc plasma intensity distribution and the cylinder substrate conformity in
order to obtain a uniform deposition//Uniform composite carbon-metal
depositions on half cylinder (plain bearing) surfaces. Improving the tribologic properties of half cylinder elements. |
20.09.2008 |
Output:
Elaboration of
metal-carbon coating methods in order to prepare coatings with improved tribological properties and studies on the involved
phenomena.
Dissemination: scientific publications, conferences, website
Fulfilled
targets:
There
was fulfilled the first target concerning “Study of the existent TVA
solutions on international level; Analysis of the tribological
test methods for the antifriction layers manufacture; Simulation using the
finite element analysis software”, deadline: 30.11.2006
Equipment
acquisition: Was purchased a Ball-on-disc
Tribometer, from CSM,
Publications:
•
Conferences:
• D. Buzescu,
M. Pascovici, “Bearing Behavior under Unusual Operating Conditions”, 5th EDF
and LMS