摘要
利用阳极氧化法在钛表面制备具有不同管径的TiO2纳米管层,分别在大气及润滑液环境里,以球/平面接触方式,在PLINT高精度液压伺服式微动磨损试验机上,对经阳极氧化处理的纯钛(对磨偶件为12mmGCr15钢球)在40N的法向载荷下进行微动磨损试验,对试样表面形貌和显微硬度进行分析,采用轮廓仪、扫描电子显微镜和X射线能量色散谱仪对磨斑进行分析。结果表明:润滑时,试样的摩擦因数和磨损深度均小于干摩擦时;大管径试样在润滑下的摩擦因数最低,磨损程度也最小,当管径增至一定值(如100nm)时磨损趋缓;干摩擦下,钛表面纳米管的存在降低了摩擦因数,减小了磨损,但纳米管径大小对其磨损过程没有明显影响;纳米管层的磨损的机制为磨粒磨损、疲劳磨损、黏着磨损及氧化磨损。
TiO2 nanotube layers with different diameters on titanium were fabricated by electrochemistry anodic oxidation. The fretting wear tests of oxidated titanium flat against GCrl5 steel ball （Ф12 mm） were carried out on a PLINT fretting fatigue machine using the ball/plane approach under the 40 N tangential load in dry friction and lubrication conditions respectively. Microstructure and mierohardness of anodic oxidation coating were analyzed. Fretting scars were analyzed by scanning electron microscope equiped X-ray energy dispersion spectroscope and surface profiler. The results show that under lubrication condition, the friction coefficient and the depth of wear scar are lower than those under dry friction condition. The TiO2 nanotube specimen with the largest diameter under lubrication condition has the lowest friction coefficient and wear depth. When the diameter increases to a certain value （e. g. , 100 nm） wear is slowed down. Under dry friction condition, the existence of the TiO2 nanotube layers reduces the wear and friction coefficient. The sizes of the nanotubes don＇t obviously influence on wear process of specimens. The wear mechanism of the nanotube layers involves abrasive wear, fatigue wear, adhesive wear and oxidative wear.
出处
《润滑与密封》
CAS
CSCD
北大核心
2009年第10期1-5,25,共6页
Lubrication Engineering
基金
教育部高等学校全国优秀博士学位论文作者专项资金项目(200554)
国家自然科学基金重点项目子课题(50535050)
