Effect of morphology of carbon black fillers on the tribological properties of fibrillated PTFE
Effect of morphology of carbon black fillers on the tribological properties of fibrillated PTFE
复制标题
DOI：
10.1016/j.wear.2007.03.013
复制
发表时间：
2008-02
期刊：
影响因子：
5
通讯作者：
Y. Takeichi;A. Wibowo;M. Kawamura;M. Uemura
中科院分区：
文献类型：
--
作者：
Y. Takeichi;A. Wibowo;M. Kawamura;M. Uemura
采用环盘式摩擦磨损试验机研究了12种炭黑填充原纤化聚四氟乙烯的摩擦学性能。研究了炭黑的平均粒径、氮气表面积和DBP吸附量对摩擦系数和比磨损率的影响。本实验中使用的炭黑分为小炭黑（d≤25nm）和大炭黑（d≥38nm）。当炭黑的质量分数为10%时，耐磨性最好。与纯PTFE相比，大炭黑填充PTFE复合材料的摩擦系数降低。摩擦系数随着氮气表面积的减小和g因子或氮气表面积与平均粒径的乘积的减小而线性减小。PTFE复合材料的比磨损率随平均粒径的减小而减小，随平均粒径与摩擦系数乘积的减小而减小。这些结果意味着炭黑的减磨作用是通过捕获在炭黑中而使PTFE纤维难以从复合材料中提取，并且大填料在很大程度上促进纤维和炭黑之间的相互缠绕，并导致高磨损率。
The tribological properties of fibrillated PTFE filled with 12 kinds of carbon black were studied using ring-on-disk tribometer. The effects of the average particle diameter, the nitrogen surface area and the DBP absorption of carbon black on the friction coefficient and the specific wear rate were studied. The carbon blacks used in this experiment were categorized into small carbon blacks (d≤25nm) and large carbon blacks (d≥38nm). The 10mass% of carbon black was the best concentration for the highest wear resistance. The PTFE composites filled with the large carbon blacks showed lower friction coefficient than that of the pure PTFE. The friction coefficient decreased linearly with the decrease of the nitrogen surface area and with the decrease of the g-factor or the product of the nitrogen surface area and the average particle diameter. The specific wear rate of the PTFE composites decreased with the decrease of the average particle diameter and with the decrease of the product of the average particle diameter and friction coefficient. These results mean the wear reducing action of carbon black is to make it difficult to extract the PTFE fibre from the composite by getting caught in the carbon black and the large fillers promote the inter-winding between the fibre and the carbon black on a large degree, and result in high wear rate.