Characteristic evaluation of friction and wear in the C-N and TiN coated gear |
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Authors: | Long Lu Feng Xu Tao Jiang Qi Zhang and Sungki Lyu |
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Affiliation: | (1) Department of Mechanical and Civil Engineering, University of Oviedo, Gij?n, Asturias, Spain;(2) Department of Physical and Analytical Chemistry, University of Oviedo, Oviedo, Asturias, Spain; |
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Abstract: | C-N films were deposited on the 20CrMo alloy steel substrate by the Plasma Source Ion Implantation (PSII) method and TiN films
were coated on the same material by the Physical Vapor Deposition (PVD) method. It was found that friction coefficient of
C-N coating were relatively lower than TiN coating. And with the load increased, the friction coefficients of C-N coating
and TiN coating were both decreased. Then the author puts forward the test rig, working under the conditions of 1,800 rpm,
20 N·m for 100 h. The observations by microscope showed the wear reduced. The antiwearing performance enhanced prominently.
But the TiN coated gear had a more serious friction phenomenon than C-N coated gear. This is caused by that coating of TiN,
which was made at a high temperature about 500°C. The high temperature led to the substrate intenerated and the surface hardness
had decreased from 850 HV to 630 HV. PSII method eliminates the tempering problem of the coating of C-N films, which had better
wear resistance than TiN films. The friction and wear resistance of gears which coated by C-N films ameliorated significantly. |
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