Determination of the influence of a filler on the properties of composite materials based on polytetrafluorothylene for tribosystems of mechanisms and machines

Abstract

This paper reports a comprehensive laboratory study into the thermophysical, physical-mechanical characteristics, and tribological properties of the designed composite materials based on polytetrafluoroethylene. In the structures of machines and mechanisms, a significant role belongs to the tribological conjugations made from polymeric and polymer-composite materials. The reliability of machines, in general, depends to a large extent on the reliability of movable connections. Composite materials of nonmetallic origin have a low cost, they are resistant to most aggressive chemicals and are capable of operating under conditions without lubrication. It was established that the characteristics and properties of materials must be adapted to the working conditions of separately considered tribological conjugations. The mechanisms of thermal destruction have been established, both in the basic material and the carbon fiber based on it. It was found that carbon fiber, regardless of its content (quantity) in the polymer-composite material based on polytetrafluoroethylene, is mainly oriented perpendicular to the force application plane. It was found that with an increase in the carbon fiber content from 10 to 40 % by weight, the heat capacity decreases by 16‒39 % compared to the main material. The optimal operating modes for the designed composite materials have been substantiated on the basis of a pv factor: under a dry friction mode – up to 4 MPa∙m/s; at friction with lubrication – up to 36.4 MPa∙m/s. The dependence has been established of the friction coefficient on the operating modes of a composite material based on polytetrafluoroethylene containing 20 % by weight of carbon fiber when lubricated with oil and water. The results reported here make it possible to synthesize the physical-mechanical characteristics and tribological properties of composite materials in accordance with the required modes of tribological conjugation.

Determining the influence of a filler on the properties of composite materials based on Phenylone C2 for tribojunctions in machines and assemblies

“…The study of friction surfaces and the distribution of TEG in the polymer matrix was carried out using the microscope NEOFOT 30 (Germany) (Fig. 1) [12].…”

Influence of high-modulus filler content on critical load on tribocouples made of microheterophase polymer composite materials

“…However, it is known that the value c p is greater the greater 0 U and f U 0 . If we take into account the results of the study of the evolution of the structure of multiphase PCM, we can conclude that the deformation processes during friction PCM with fillers with low and medium modulus of elasticity more accurately describes the Ansell-Lenel mechanism [4][5][6]. Knowing the values of the average PCM stresses and fillers by the equations:…”

Optimum abrasive wear resistance for epoxy composites reinforced with polyethylene (PET) waste using Taguchi design and neural network

“…The solution to the problem of increasing the abrasive wear resistance of epoxy composites will contribute to improving the reliability of connecting joints in machine structures. Moreover, adding fillers from cheap and lightweight sources will help reduce production costs and, on the other hand, preserve the environment [1,2]. Adopting heating as a method for recycling waste results in a filler with varying specifications depending on the heating period.…”