摘要
The micro-crystalline diamond (MCD) and fine-grained diamond (FGD) films are deposited on commercial silicon nitride inserts by the hot-filament chemical vapor deposition (HFCVD) method. The friction andcutting properties of as-deposited MCD and FGD films coated silicon nitride (Si3N4) inserts are comparatively investigated in this study. The scanning electron microscopy (SEM) and Raman spectroscopy are adopted to studythe characterization of the deposited diamond films. The friction tests are conducted on a ball-on-plate typereciprocating friction tester in ambient air using Co-cemented tungsten carbide (WC-Co), Si3N4 and ball-bearing steel (BBS) balls as the mating materials of the diamond films. For sliding against WC-Co, Si3N4 and BBS,the FGD film presents lower friction coeffcients than the MCD film. However, after sliding against Si3N4, the FGD film is subject to more severe wear than the MCD film. The cutting performance of as-deposited MCD and FGD coated Si3N4 inserts is examined in dry turning glass fiber reinforced plastics (GFRP) composite materials,comparing with the uncoated Si3N4 insert. The results indicate that the lifetime of Si3N4 inserts can be prolonged by depositing the MCD or FGD film on them and the FGD coated insert shows longer cutting lifetime than the MCD coated one.
The micro-crystalline diamond （MCD） and fine-grained diamond （FGD） films are deposited on commercial silicon nitride inserts by the hot-filament chemical vapor deposition （HFCVD） method. The friction and cutting properties of as-deposited MCD and FGD films coated silicon nitride （Si3N4） inserts are comparatively investigated in this study. The scanning electron microscopy （SEM） and Raman spectroscopy are adopted to study the characterization of the deposited diamond films. The friction tests are conducted on a bail-on-plate type reciprocating friction tester in ambient air using Co-cemented tungsten carbide （WC-Co）, Si3N4 and bail-earing steel （BBS） balls as the mating materials of the diamond films. For sliding against WC-Co, Si3N4 and BBS, the FGD film presents lower friction coefficients than the MCD film. However, after sliding against Si3N4, the FGD film is subject to more severe wear than the MCD film. The cutting performance of as-deposited MCD and FGD coated Si3N4 inserts is examined in dry turning glass fiber reinforced plastics （GFRP） composite materials, comparing with the uncoated Si3N4 insert. The results indicate that the lifetime of Si3N4 inserts can be prolonged by depositing the MCD or FGD film on them and the FGD coated insert shows longer cutting lifetime than the MCD coated one.
基金
the National Natural Science Foundation of China (No. 50975177)
the Shanghai Scienceand Technology Plan of Action for Technical Standardsfor Innovation and Special (No. 08DZ0501700)
