铁氟龙 发表于 2009-5-1 10:36:42

聚四氟乙烯表面微摩擦学特性的改性

本帖最后由 铁氟龙 于 2009-5-1 10:48 编辑

英文标题:Modification of surface tribology characteristic of PTFE   
英文刊名:THE CHINESE JOURNAL OF NONFERROUS METALS
关键词:纳米复合薄膜;A1203;聚四氟乙烯;摩擦特性;表面改性
摘要:利用离子注入系统PSⅡ和MEVVA80-10型离子注入机,采用射频磁控溅射和等离子束注入沉积两种技术,制备Ag、Al2O3、PTFE和Al2O3/PTFE纳米复合薄膜.采用XRD、AFM/FFM和纳米探针测试方法,研究5种薄膜改性聚四氟乙烯(PTFE)表面微摩擦学特性的效果.结果表明:在相同磨损测试条件下,离子注入技术制备的Al2O3/PTFE纳米复合薄膜的损伤深度比其他样品的浅,样品的耐磨性至少增加4倍;铝离子注入Al2O3/PTFE纳米复合膜的化学成分主要是Al、F、C、O和N;除C2F4峰外,还存在AlF3、Al2O3和AlN峰,且Al2O3为γ相,呈体心立方结构;薄膜硬度达到0.15、0.19和0.65 Gpa;弹性模量为0.9、1.5和2.2 Gpa.   
Abstract:Using ion implantation system PS Il and MEWA80—10 ion implantation machine,Ag,A1203,P邗E,
A1203/Pm nanometer laminated films were prepared by RF magnctron sputtering and plasma beams into sedimentary.
Using XRD.AFM/FFM and nanometer probe test method,the PTFE surface tribology characteristic of five kinds of
modified films were studied.The results show that under the same test condition,A1203/PTFE nanometer laminated
film’s damage depth made by the ion implantation technology is shallower than those of other samples,while the wear
resistance increases at least 4 times.The chemical composition of aluminum ion implantation A1203/PTFE nanometer
compound films is mainly AI,F'C,O and N.AIF3,A1203 and A1Npeaks exist as well as C2F4 peak,and A1203 is r-phase
with body—centered cubic structure.The hardness of the film achieves 0.1 5,O.19 and O.65 GPa.The elastic modulus is 0.9,1.5 and2.2GPa.
Key words:nanometer compound membrane;A1203;PTFE:tribology characteristic;superficial modification
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      自1989年我国借鉴前苏联先进技术开始研制弹性金属塑料瓦(EMP)以来,虽然利用聚四氟乙烯(PTFE)一金属弹性瓦改善了轴承瓦面的耐磨性,使轴瓦发热问题在一定程度上得到解决。但另一个难题一直没有解决:即由于聚四氟乙烯材料的摩擦因数较小,且随着轴瓦转速的增大磨损情况将趋于严重,尤其是在停机时,油膜失去作用,产生瞬时干磨擦。
      如何使这一难题得到解决,是提高EMP瓦寿命及质量的关键,已成为制造商亟待解决的问题。PTFE改性研究己成为近20年来材料领域研究的热点之一,如日本东芝公司为改善PTFE的压缩弹性、蠕变性和耐磨性,在PTFE中填充玻璃纤维和MoS2。张招柱等利用Pb304、PbO和Cu20这3种金属氧化物填充PTFE,对干摩擦与GCrl5轴承钢对磨时的摩擦学性能进行了研究。
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