A Study Of Multi-Interface Fluctuation And Anti-Wear Mechanism Of Alumina PTFE Transfer Film

Solid lubricating materials study is important in aerospace engineering.The anti-wear performance of self-lubricating polymers has been enhanced by using nano-size filler.Transfer film provides protection for both composite and metal interface.And even under steady state,there is still wear existed in the counterfaces.But the quantitative study of wear of metal counterface is rarely.In this paper,the friction and wear models of alumina PTFE composites are studied.The wear of counterface and volume of transfer film growth are quantitatively analyzed.A numerical model of wear interface is established based on the physical and chemical information of counterface.Firstly,wear surfaces of various periods were prepared by self-made tribometer and "stripe test method".Then the interface behavior was measured and recorded by stylus,interference-light profilometer and scanning electron microscopy.Moreover,physical and chemical changes of transfer films were recorded by contact angle measuring instrument and Fourier transform infrared spectroscopy.After analyzing the wear data of metal substrates,it is found that there is a strong linear relationship between the inter facial wear and the transfer film coverage(R2 =0.91).The mixed wear model was used to fit the data and get a good agreement with the experimental results.The coexistence of adhesive wear and fatigue wear of metal substrate surface polymer exerted on was proved.Furthermore,Using the study of debris behavior,the physical and numerical models are established to simulate the volume and quantity of debris.the surface energy of debris and counterface are measured for Monte Carlo simulation method.By input the default physical and chemical value,the wear rate of composites and transfer film growth rate are obtained.Comparing with the experimental data,some of the results of the calculation matched well with the experimental data.With the establishment of this model,we have a deeper understanding of the anti-wear mechanism of Alumina PTFE composites and the fluctuation behavior of transfer film.