摘要
研究不同摩擦体系下法向载荷对浸渍石墨的摩擦磨损特性的影响,采用扫描电子显微镜和激光共聚焦显微镜分别表征摩擦表面磨痕形貌、磨痕轮廓,对浸渍石墨与对偶球(GCr15钢球和Si_(3)N_(4)陶瓷球)的摩擦磨损情况与机制进行评估分析。结果表明:磨损痕迹随着施加载荷的增加而加深加宽,磨损率与法向载荷呈负相关,而摩擦因数、磨损体积则与法向载荷呈正相关;小载荷作用下石墨的磨损机制为黏着磨损和磨粒磨损,大载荷下则主要表现为黏着磨损、氧化磨损以及疲劳磨损;GCr15/石墨摩擦副相比于Si_(3)N_(4)/石墨摩擦副磨损率较低,在摩擦过程中形成完整、连续性更好的“第三体”转移膜减轻了磨损,对石墨基体起到保护作用。
The effects of normal load on the friction and wear characteristics of impregnated graphite under different friction systems were investigated.The surface wear morphology and wear profile were characterized by scanning electron microscope and laser confocal microscope,respectively,and the friction and wear mechanism between impregnated graphite and dual balls(GCr15 steel ball and Si_(3)N_(4)ceramic ball)were evaluated.The results show that the wear marks deepen and widen with the increase of normal load.The wear rate is negatively correlated with the normal load,while the friction coefficient and wear volume is positively correlated with the normal load.The wear mechanism of graphite under small load is adhesive wear and abrasive wear,while the main wear mechanism under large load is adhesive wear,oxidation wear and fatigue wear.Compared to the friction pairs of Si_(3)N_(4)/graphite,the friction pairs of GCr15/graphite have lower wear rates and form a complete and more continuous"third body"lubricating film during the friction process,which reduces wear and protects the graphite matrix.
作者
宋伟
李凯民
马荣荣
李万佳
丁雪兴
陈昊翔
SONG Wei;LI Kaimin;MA Rongrong;LI Wanjia;DING Xuexing;CHEN Haoxiang(College of Petrochemical Industry,Lanzhou University of Technology,Lanzhou Gansu 730050,China)
出处
《润滑与密封》
CAS
CSCD
北大核心
2024年第7期58-66,共9页
Lubrication Engineering
关键词
浸渍石墨
接触载荷
摩擦磨损
转移膜
impregnated graphite
contact load
friction and wear
lubrication film
