摘要
金属粉体、陶瓷颗粒及玻璃微珠等可作为PTFE的改性填料提高其耐磨性,但过去少有上述填料用于PTFE基粘结固体润滑涂层耐磨改性的研究。制备了未添加填料的和分别填充Cu,SiC,c-BN,h-BN,玻璃微珠(T-60)的PTFE基粘结固体润滑涂层,评定了各涂层的附着力、耐冲击性;并考察了其在室温干摩擦条件下的滑动摩擦磨损性能,并分析了磨痕形貌。结果表明:各填充涂层附着力1~2级,抗冲击性良好;T-60和c-BN填充试样在试验条件下磨损量近乎为零,与未填充试样相比,SiC和h-BN填充试样磨损量分别下降82.9%,74.4%,Cu填充试样磨损量下降幅度最小;填充试样的磨痕均呈现出一定程度犁沟和切削,其中Cu填充试样磨痕深且宽,c-BN,SiC,T-60,h-BN填充试样磨痕浅且窄,c-BN和T-60填充试样磨损表面的转移膜最均匀;填料改变了粘结涂层的磨损机理,使其由单一的PTFE黏着磨损转变为以填料的磨粒磨损为主、PTFE的黏着磨损为辅的复合磨损,增强了涂层的抗极压承载能力和转移膜与基体间的结合力,提高了涂层的摩擦磨损性能。
Cu,SiC,c-BN,h-BN,and glass microsphere (T-60) were separately introduced as fillers into polytetrafluoroethylene-based (denoted as PTFE-based) bonded solid lubricant coatings. The adhesion to substrate and anti-impact behavior of as-prepared coatings were measured. Moreover,the friction and wear behavior of the PTFE-based bonded solid lubricant coatings under room temperature dry sliding condition was evaluated,and the morphology of their wear scars was observed. Results indicated that the PTFE-based bonded solid lubricant coatings containing fillers possessed adhesion to substrate of Grade 1 ~ 2 as well as good anti-impact strength. In the meantime,PTFE-based bonded solid lubricant coatings filled with T-60 or c-BN had nearly zero wear mass loss. The wear mass loss of the coatings filled with SiC or h-BN was reduced by 82. 9% and 74. 4% as compared with that of unfilled PTFE-based bonded solid lubricant coating,but the coating filled with Cu showed the smallest change in wear mass loss. Moreover,the wear scars of the filled PTFE based bonded solid lubricant coatings showed signs of scuffing and cutting,while the fillers led to changes in the wear mechanism of PTFE-based bonded solid lubricant coatings. Namely,unfilled coating was dominated by adhesion wear,but the filled PTFE based bonded solid lubricant coatings were dominated by abrasive wear in association with mild adhesion wear,exhibiting improved friction and wear behavior.
出处
《材料保护》
CAS
CSCD
北大核心
2013年第5期51-53,1-2,共3页
Materials Protection
关键词
粘结固体润滑涂层
PTFE
填料
摩擦磨损
附着力
耐冲击性
bonded solid lubricant coatings
PTFE
fillers
friction and wear behavior
adhesion
anti-impact strength