Modelling of mechanical properties of Pa6 based reinforced graphite and graphite nano platelets composites using different aspect ratio

Abstract

Purpose This study aims to fabricate and study the effect of five cumulative graphite (G) and graphite nanoplatelets (GNP) filler loading composites by polymerising PA6 precursor; monomer epsilon caprolactam with the two carbons in situ while taking cognisance of the mixing effects (simultaneous stirring and sonication at varying amplitudes and duration). Different aspect ratios will be used to model the two streams of polymerisations. Design/methodology/approach High viscosity extrusion grade PA6 and synthetic G of less than 2 µm particle size were used as fillers. GNP and G are dried for 6 h in vacuum oven at 90°C. Prior to in situ polymerisation, probe sonication was applied to disperse fillers in molten ɛ-caprolactam, the PA6 monomer. Five carbon loadings were made, that is 5–25 Wt.% for G and 0.5–2.5 Wt.% for GNP composites. Two different sonification regimes were applied 20% sonication amplitude for 20 min (20/20) and 40% sonication amplitude for 10 min (40/10). Findings Better tensile properties were achieved using the 20/20 processing streams for both G and GNP. The G- and the GNP-based composites systems of the 20/20 processing stream had tensile modulus and yield strength retained or improved above the unfilled PA6 value. The highest modulus obtained in the 20/20 streams are 1,878 and 1,201 MPa, respectively, for GNP and G at the highest loading levels, while the 40/10 processing streams had 963 and 1,247 MPa, respectively, for the GNP and G. Originality/value To the best of the authors’ knowledge, nobody has ever used sonification amplitude to compare mechanical properties.

An investigation on the influence of sintering temperature on microstructural, physical and mechanical properties of Cu-SiC composites

“…The enhancement in hardness is due to the uniform dispersion of hard SiC-reinforcement particles as well as the good bonding to matrix alloy in the composites leads to improve the hardness of the composite. The addition of a higher amount of reinforced material into matrix element results in more dislocation which also results in the increment of the hardness of the composite (Somani et al , 2018b; Gupta et al , 2020; Somani et al , 2021; Yan, 2020; Bhavya Swathi et al , 2020; Li et al , 2016; Reddy et al , 2019; Umar et al , 2021).…”

“…Optimum results were found for the sintering temperate of 800°C. Many researchers around the globe have contributed in these area (Somani et al , 2018b; Gupta et al , 2020; Somani et al , 2021; Yan, 2020; Bhavya Swathi et al , 2020; Li et al , 2016; Reddy et al , 2019; Umar et al , 2021). This technique has been developed for composite fabrication.…”

Experimentation and optimization of wear behavior on polytetrafluoroethylene composites using response surface methodology and bald eagle search optimization

“…This is due to the better load carrying capability of different reinforcing particulates, resulting in less friction film with suppressed abrasion rates. [12,13] The input process parameters like sliding velocity, sliding distance, and the application of load are the major influencing factors of increased wear rate behavior of composites. [14,15] The graphite filler acted as a solid lubricant and exhibited reductions in COF ($27% on average) and mass loss ($4.2 times lower on average).…”