Abstract
This paper investigates the effect of mechanical, microstructural and dry sliding wear behaviour of Al-Si/2wt%MoS2, Al-Si/12wt%Al2O3, and Al-Si/12wt% Al2O3/2wt%MoS2 composites that prepared using the stir-casting route. To avoid friction and wear at the interfaces of materials, an attempt has been made by adding solid lubricant MoS2 to build such a self-lubricating composite with Al-matrix. The tribological analysis has been described based on the Taguchi orthogonal array (L27). Three variables combination such as sliding velocity, sliding distance and contact pressure are used for this study to determine the tribological responses, i.e. wear rate and coefficient of friction. The properties of composites were improved by increasing the weight % of MoS2 and Al2O3. The tensile strength of Al-Si/2MoS2, Al-Si/12Al2O3, and Al-Si/12 Al2O3/2MoS2 composites is 6.02%, 12.46%, and 2.44% compared to the base matrix. The addition of MoS2 helps the hybrid composite to attain better tribological properties with a slightly lower specific strength. Analysis of variance showed that the composites such as Al-Si/2 MoS2 and Al-Si/12Al2O3/2MoS2 were strongly influenced by the pressure in wear rate. Similarly, sliding velocity affects the coefficient of friction for Al-Si/2MoS2. Wear tracks formed during the dry slide process were analysed using optical and SEM with an EDS. It was discovered that pressure plays a vital effect in the wear mechanism. The hybrid composite (Al-Si/12 Al2O3/2MoS2) material can be utilised in place of conventional materials in tribological demanding automotive applications
Highlights
In recent times, technologists constantly develop novel materials, having lightweight and good reliability parts, much like in the vehicle sector, to meet the ever-increasing demands and complexity of the new technologies
The improvement of UTS may be caused to the strong Al2O3 reinforcement particles lead to the homogenous dispersion in the materials and acts as a load barrier
The decreased UTS in the hybrid and MoS2 composites can be attributable to low ultimate MoS2 tensile strength compared with the Al-Si matrix resulting in a decrease in UTS of MoS2 composites
Summary
Technologists constantly develop novel materials, having lightweight and good reliability parts, much like in the vehicle sector, to meet the ever-increasing demands and complexity of the new technologies. A number of economic benefits have been associated with aluminium matrix composites, being good modulus of elasticity, wear resistance, low cost, high strength, and thermal conductivity, along with use in aircraft, space, defence, and automobiles [1,2,3]. That is usually difficult to do but can be done while interfaces are wearing components. Few lubricants do not need a liquid medium to have low friction. While they are in the solid state to decomposition at high temperature, it is difficult to stay the liquid lubricant for some time, and solid lubricants are used to meet the specific requirements[4,5,6,7,8]
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