<正>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 condi- tions 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 sur- face,which results in more weight loss of nitrided gears.The morphology of the surface suggests TiN film with more than 2000HV is so dense and smooth that coated-TiN gears have higher wear resis- tance 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.
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机译:Comparative experimental study on application feasibiility of MTCVD TiCN-Al2O3-TiOCN multi-layer coated carbide and PVD TiN single layer coated composite ceramic inserts during dry machining of Ti-6Al-4V