摘要
利用MMU-5G销-盘式端面磨损试验机考察了干摩擦条件下Si3N4-hBN复合陶瓷与1Cr18Ni9Ti配副时的摩擦磨损性能,分别采用扫描电子显微镜(SEM)、激光扫描显微镜(LSM)、X光电子能谱仪(XPS)、X射线能谱仪(EDS)、电子探针(EPMA)和X射线衍射仪(XRD)分析摩擦面以及磨屑的形貌和物质组成.结果表明:Si3N4-hBN/1Cr18Ni9Ti摩擦副的摩擦系数随hBN含量的增加而降低,当hBN体积含量为30%时,摩擦系数降至0.03,Si3N4-hBN复合陶瓷的磨损率接近于零.在干摩擦条件下,Si3N4-hBN复合陶瓷与1Cr18Ni9Ti配副时,摩擦表面上形成含SiO2、B2O3和Fe2O3的表面膜,起到良好的减摩作用.
The main objective of this paper is to study the tribological behavior of Si3N4-hBN composites sliding on stainless steel.Unlubricated wear tests were carried out on a MMU-5G type pin-on-disc wear tester.The results showed that the addition of hBN to Si3N4 resulted in a marked decrease of friction coefficient,from 0.95 for Si3N4 against stainless steel to 0.03 for Si3N4-30%hBN against stainless steel.Wear coefficients were below 10-4 mm3/（Nm）for all materials tested and decreased sharply with increasing volume fraction of hBN,e.g.nearly zero for Si3N4-20%hBN pin.The materials and worn surfaces as well as wear debris were characterized by means of scanning electron microscopy（SEM）and X-ray diffraction（XRD）.Furthermore,the tribofilms were analyzed by using electron probe microanalysis（EPMA）,laser scanning microscope（LSM）,X-ray photoelectron spectroscopy（XPS）.The analysis indicated that,under unlubricated condition,a tribo-oxide film containing B2O3,SiO2 and Fe2O3 was formed on the wearing surface.The tribofilm with a certain thickness protected both Si3N4-hBN pin and stainless steel disc,and lubricated the wear surfaces.
出处
《摩擦学学报》
EI
CAS
CSCD
北大核心
2010年第3期243-249,共7页
Tribology
基金
国家自然科学基金项目(50672074)的资助
教育部2009年全国博士生学术会议(现代摩擦学材料)的部分版面费资助
关键词
复合陶瓷
干摩擦
剥落坑
摩擦化学反应膜
composite ceramics
unlubricated
spalling pit
tribochemical film
