The effect of composite structural parameters on tribo‐mechanical characteristics and thermal conductivity of self‐lubricant composites

Abstract

This article aims to look into the impact of structural parameters on the tribological, mechanical, and thermal functions of composites. These parameters include the reinforcement type, the winding angle and winding type. The tribological characteristics of polytetrafluoroethylene (PTFE)/epoxy filament wound composites with various reinforcements including E-glass, Kevlar, and ultra-high-molecular weight polyethylene were examined under two different loads and the sliding velocity of 0.12 m/s. After the wear test, the worn surfaces were observed by scanning electron microscopy. The compressive strength of the composites was considered under static loading conditions to investigate the mechanical properties. Also, the thermal conductivity of the composites was investigated. Interfacial shear strength (IFSS) was measured by applying a single fiber microdroplet pullout test. The tribological and mechanical performance of the composites containing Kevlar reinforcement fibers was found to be better than that of PE and glass. The winding angle of 55 showed a better performance, and the hybrid winding type was more suitable than the layered one. So in general, it could be concluded that the hybrid-Kevlar/PTFE-55 composite exhibited the best tribological and mechanical performance among all composites. The thermal conductivity of hybrid-Kevlar/PTFE-55 composites was not high; therefore, it was increased by tungsten carbide (WC). According to the microdroplet test results, IFSS was the highest between Kevlar fibers and the matrix; it was raised by employing WC. The reported results may facilitate the development of self-lubricant composites embedded in WC fillers applicable in bearings.

Effect of irregular silicon carbide and tackifying phenolic resin on friction coefficients of rubber compounds

“…The abrasion performance is an important index of sole rubber materials, which determines the service life of shoes. In the field of footwear, DIN abrasion is the most commonly used index to evaluate the abrasion performance of rubber materials 35–37 . Herein, effect of SiC size, SiC content, and phenolic resin content on DIN abrasion of rubber compounds was also investigated.…”

“…This is because with the reduction of SiC particle size, the specific surface area of SiC increases, so the interface between SiC and rubber is larger, while the rubber content reduces and the SiC‐rubber interface increases with the increase of SiC content (as shown in Figure 3). The wear resistance of rubber compounds decreases with the increase of phenolic resin content because the tackifying phenolic resin used here is a kind of brittle and weak plastic 35–37 …”

“…In the field of footwear, DIN abrasion is the most commonly used index to evaluate the abrasion performance of rubber materials. [35][36][37] Herein, effect of SiC size, SiC content, and phenolic resin content on DIN abrasion of rubber compounds was also investigated. As shown in Figure 9, DIN abrasion of rubber compounds increases with the content of SiC size and phenolic resin, while it decreases with SiC content.…”

“…The wear resistance of rubber compounds decreases with the increase of phenolic resin content because the tackifying phenolic resin used here is a kind of brittle and weak plastic. [35][36][37]…”

In situ emulsion polymerization of poly (vinyl acetate) and asparagus racemosus biopolymer composites for flexible energy storage applications

“…PMCs are multi-phase materials in which an organic or inorganic component is embedded within the polymer matrix in order to achieve interesting features not demonstrated by either component alone. [1][2][3] The attributes of polymer composites are generally determined by the properties of constituents, the filler volume fraction and the dispersion of filler within the polymer matrix. Thus, the final properties of PMCs can be tailored by properly selecting the individual components, which usually have different physical and chemical properties.…”