Study On The Tribological Properties Of The Lead-free Three-layer Composites Modified By Polymers

Currently, the three-layer composites have been widely used in various fields and the requirements of the properties become more and more critical. It not only needs fine terminological properties of the three-layer composites, but also needs leadless or lead-free materials. In the background, the issue enters into the study of the polymer modified Lead-free PTFE three-layer composites. Through pre-screening experiments, FM12modified fillers, which improve the lipophilic properties of the composites, are the research subjects. Moreover, there will be a comprehensive study of the composite effects on the other modified fillers and solid lubricants.In the research work, qualified friction and wear experiment samples are first be prepared by using the production technology of PTFE composite. The experiment simulated actual conditions with dry friction, oil boundary friction and full oil conditions. The specimen wear surface characteristics are observed by optical microscopy and scanning electron microscopy. And combined with the tribological experimental results, we discuss friction and wear mechanisms of the formulation materials. The useful conclusions are as follows:1. The complex use of FM12and PPTA can make the three-layer composites of PTFE get complementary of the performance. Compare with separate filling two kinds of polymer materials, it is in favor of reducing friction and improving wear resistance.2. To the modified three-layer composite, molybdenum disulfide can greatly improve the wear resistance, and reduce friction performance in the oil-bearing working conditions. The graphite can not obviously improve the friction and wear property of FM12modified composite. Then it will make the wear volume increase significantly.3. The rare earth elements can obviously improve the interface properties among the components of the composites. However, to FM12modified materials, the rare-earth compounds obviously weaken the pro-oil and anti-wear bearing capacity of the original recipes materials.4. Filling PI-MS10obviously improves the friction and wear property of FM12/PPTA modified materials in the conditions of all. At the same time, it inherits the fine characteristics of reducing friction and resistant wear, when the original recipes containing FM12are in the oil-rich conditions. The results show that it created favorable conditions in industrial applications for such three-layer composite materials.