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LI Hui
LI Runfang
State Key
Laboratory of Mechanical
Transmission,
Chongqing University,
Chongqing 400044, China
XU Hongbin
ZHANG Jin
Department of
Materials Science
and Engineering,
Chongqing Institute of Technology, Chongqing 400050, China |
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EXPERIMENTAL STUDY ON SUPERFICIAL
COAT OF GEARS
OF NITRIDED 32Cr2MoV COATED
WITH TiN FILM BY
MULTI-ARC
ION PLATING*
Abstract:
After 32CrMoV is selected to manufacture nitrided gears coated with TiN by multi-arc ion plating, all of these uncoated gears and coated gears run in the gearbox under the same initial conditions so as to compare their difference concerning properties and microstructure. Experiment results indicate that tooth surface of the coated-TiN gears does not suffer surface abnormalities in meshed zone. Instead, the gears with nitrided case exhibit an abrasion mark on the meshed zone of tooth surface, which results in more weight loss of nitrided gears. The morphology of the surface suggests TiN film with more than 2 000 HV is so dense and smooth that coated-TiN gears have higher wear resistance compared with the uncoated gears. The microstructure of coated-TiN gears is finer, hardness is higher and its distribution of coated-TiN gears is more reliable than uncoated ones, which makes nitride layer combined with TiN film tightly. Consequently, the wear-resistance of gears has been dramatically promoted.
Key words:
Gear Multi-arc ion plating TiN Wear-resistance |