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碳烟对ZDDP摩擦反应膜分布及力学性能的影响

发表时间:2017-07-31  浏览量:51  下载量:12
全部作者: 凤维民,胡献国
作者单位: 合肥工业大学摩擦学研究所
摘 要: 为探究发动机燃油碳烟对润滑油添加剂二烷基二硫代磷酸锌(ZDDP)摩擦反应膜的破坏机制及其磨损机理,采用高频往复摩擦磨损试验机对含碳烟和ZDDP的液体石蜡进行摩擦学试验,使用三维激光扫描仪、扫描电子显微镜/能谱仪(scanning electron microscope/energy dispersive spectroscopy,SEM/EDS)、纳米压痕仪对磨损表面ZDDP摩擦反应膜的分布和力学性能进行表征。结果表明,高含量的碳烟会增大摩擦系数和磨损量,而低含量的碳烟则会降低摩擦系数和磨损量;磨损表面的犁沟随碳烟含量的增加而增多并加深;ZDDP摩擦反应膜因碳烟的介入而出现分布不均的现象;相应磨损表面的硬度(H)降低、弹性模量(E)升高,H/E值降低。碳烟在摩擦副间充当了第三体磨粒的作用,将ZDDP摩擦反应膜刮离磨损表面,减弱了膜对基体材料的保护作用,磨损表面的力学性能因而变差,减摩抗磨性能降低。
关 键 词: 机械摩擦、磨损及润滑;磨损;碳烟;摩擦反应膜;分布;力学性能
Title: Effect of soot on distribution and mechanical performances of ZDDP tribofilm
Author: FENG Weimin, HU Xianguo
Organization: Institute of Tribology, Hefei University of Technology
Abstract: In order to understand the failure mechanism of ZDDP tribofilm caused by soot as well as the wear mechanism, tribological tests were conducted using liquid paraffin containing ZDDP and different contents of soot as lubricant by means of high frequency reciprocating tribometer. Then 3D laser scanner, scanning electron microscope/energy dispersive spectroscopy (SEM/EDS) and nano-indenter were adopted to analyze the distribution and mechanical performances of tribofilm on disks. The results showed that high content of soot would increase friction coefficient and wear loss while low content of soot would do the opposite. The number and depth of grooves on worn surface both increased with the increasing of the soot content. The distribution of ZDDP tribofilm became inhomogeneous when soot added. Correspondingly, the hardness (H) of worn surface decreased while the elastic modulus (E) of worn surface increased and these two led to a decrease of H/E. Soot acted as third-body abrasion in frictional pairs and scraped ZDDP tribofilm from worn surface, weakening the protection of substrate from tribofilm. The mechanical properties of worn surface deteriorated, and as a result, the antifriction and anti-wear properties of worn surface decreased.
Key words: mechanical friction, wear and lubrication; wear; soot; tribofilm; distribution; mechanical performance
发表期数: 2017年7月第14期
引用格式: 凤维民,胡献国. 碳烟对ZDDP摩擦反应膜分布及力学性能的影响[J]. 中国科技论文在线精品论文,2017,10(14):1562-1570.
 
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