The friction behavior of the hot filament chemical vapor deposition（HFCVD） diamond film plays a critical role on its applications in mechanical fields and largely depends on the environment. Studies on the tribologi...The friction behavior of the hot filament chemical vapor deposition（HFCVD） diamond film plays a critical role on its applications in mechanical fields and largely depends on the environment. Studies on the tribological properties of HFCVD diamond films coated on Co-cemented tungsten carbide （WC-Co） substrates are rarely reported in available literatures, especially in the water lubricating conditions. In this paper, conventional microcrystalline diamond（MCD） and fine-grained diamond（FGD） films are deposited on WC-Co substrates and their friction properties are evaluated on a reciprocating ball-on-plate tribometer, where they are brought to slide against ball-bearing steel and copper balls in dry and water lubricating conditions. Scanning electron microscopy（SEM）, atomic force microscopy（AFM）, surface profilometer and Raman spectroscopy are adopted to characterize as-deposited diamond films; SEM and energy dispersive X-ray（EDX） are used to investigate the worn region on the surfaces of both counterface balls and diamond films. The research results show that the friction coefficient of HFCVD diamond films always starts with a high initial value, and then gradually transits to a relative stable state. For a given counterface and a sliding condition, the FGD film presents lower stable friction coefficients by 0.02-0.03 than MCD film. The transferred materials adhered on sliding interface are supposed to have predominate effect on the friction behaviors of HFCVD diamond films. Furthermore, the effect of water lubricating on reducing friction coefficient is significant. For a given counterpart, the stable friction coefficients of MCD or FGD films reduce by about 0.07-0.08 while sliding in the water lubricating condition, relative to in dry sliding condition. This study is beneficial for widespread applications of HFCVD diamond coated mechanical components and adopting water lubricating system, replacing ofoil lubricating, in a variety of mechanical processing fields to implement the green pr展开更多
对摩擦性能优良的三嗪杂环进行水溶性改良,合成了一种无灰无磷水基润滑添加剂2,4,6-三(N,N-二羟乙基氨基亚甲基硫代)-均三嗪(SNOT),并用红外光谱仪对其结构进行分析。以自来水为基础液,采用四球摩擦磨损试验机考察了其在基础液中的摩擦...对摩擦性能优良的三嗪杂环进行水溶性改良,合成了一种无灰无磷水基润滑添加剂2,4,6-三(N,N-二羟乙基氨基亚甲基硫代)-均三嗪(SNOT),并用红外光谱仪对其结构进行分析。以自来水为基础液,采用四球摩擦磨损试验机考察了其在基础液中的摩擦学性能。结果表明,该添加剂能够较大程度地提高基础液的极压性能,并显著提高其抗磨减摩性能。通过磨斑表面的金相照片和 X 光能量色散谱(EDS)分析可知,在摩擦过程中,该添加剂与摩擦副表面发生了复杂的摩擦化学反应,在其表面生成硫、氮等复合边界润滑膜,从而起到极压抗磨减摩作用。展开更多
基金supported by National Natural Science Foundation of China (Grant No. 50575135)Program for New Century Excellent Talents of Ministry of Education of China (Grant No. NCET-06-0399)Tribology Science Fund of the State Key Laboratory of Tribology, China
文摘The friction behavior of the hot filament chemical vapor deposition（HFCVD） diamond film plays a critical role on its applications in mechanical fields and largely depends on the environment. Studies on the tribological properties of HFCVD diamond films coated on Co-cemented tungsten carbide （WC-Co） substrates are rarely reported in available literatures, especially in the water lubricating conditions. In this paper, conventional microcrystalline diamond（MCD） and fine-grained diamond（FGD） films are deposited on WC-Co substrates and their friction properties are evaluated on a reciprocating ball-on-plate tribometer, where they are brought to slide against ball-bearing steel and copper balls in dry and water lubricating conditions. Scanning electron microscopy（SEM）, atomic force microscopy（AFM）, surface profilometer and Raman spectroscopy are adopted to characterize as-deposited diamond films; SEM and energy dispersive X-ray（EDX） are used to investigate the worn region on the surfaces of both counterface balls and diamond films. The research results show that the friction coefficient of HFCVD diamond films always starts with a high initial value, and then gradually transits to a relative stable state. For a given counterface and a sliding condition, the FGD film presents lower stable friction coefficients by 0.02-0.03 than MCD film. The transferred materials adhered on sliding interface are supposed to have predominate effect on the friction behaviors of HFCVD diamond films. Furthermore, the effect of water lubricating on reducing friction coefficient is significant. For a given counterpart, the stable friction coefficients of MCD or FGD films reduce by about 0.07-0.08 while sliding in the water lubricating condition, relative to in dry sliding condition. This study is beneficial for widespread applications of HFCVD diamond coated mechanical components and adopting water lubricating system, replacing ofoil lubricating, in a variety of mechanical processing fields to implement the green pr
文摘对摩擦性能优良的三嗪杂环进行水溶性改良,合成了一种无灰无磷水基润滑添加剂2,4,6-三(N,N-二羟乙基氨基亚甲基硫代)-均三嗪(SNOT),并用红外光谱仪对其结构进行分析。以自来水为基础液,采用四球摩擦磨损试验机考察了其在基础液中的摩擦学性能。结果表明,该添加剂能够较大程度地提高基础液的极压性能,并显著提高其抗磨减摩性能。通过磨斑表面的金相照片和 X 光能量色散谱(EDS)分析可知,在摩擦过程中,该添加剂与摩擦副表面发生了复杂的摩擦化学反应,在其表面生成硫、氮等复合边界润滑膜,从而起到极压抗磨减摩作用。
