Abstract
The aluminium metal matrix composite reinforced with ceramic material of Silicon carbide (SiC) has good mechanical properties. However, aluminium based ceramic composites require improvements in their lubrication and tribological properties. In this study an attempt is made in the development of a new material through powder metallurgy technique by the addition of Graphite, which acts as a solid lubricant. This work investigated the influence of graphite on the wear behaviour of Al 7075/SiC /X wt.% graphite(X=0, 5 and 10) hybrid composite. The investigation reveals the effectiveness of incorporation of graphite in the composite for gaining wear reduction. The Al 7075 (aluminium alloy 7075) reinforced with SiC –graphite were investigated. The composites were fabricated using powder metallurgy route. The microstructures, material combination, wear and friction properties were analysed by scanning electron microscopy, XRD, and pin-on-disc wear tester. The newly developed aluminium composite has significant improvements in tribological properties with a combination of 5% Silicon carbide (SiC) and 5% Graphite. The test reveals that sliding distance of 1000 m and sliding speed of 1.5 m/s with applied load of 5 N result in minimum wear loss of 0.01062g and coefficient of friction as 0.1278.
Highlights
MMCs -Metal matrix composites possess many advantages over monolithic materials, MMCS are basically metallic alloys reinforced with mostly ceramic materials [1,2]
The X-ray diffraction measurements (XRD) pattern confirmed the presence of aluminium, Gr (C) and Silicon carbide (SiC) particles in the hybrid nano-composite
SEM Analysis: The polished specimen images were captured in the scanning electron microscopy with various magnification and scale
Summary
MMCs -Metal matrix composites possess many advantages over monolithic materials, MMCS are basically metallic alloys reinforced with mostly ceramic materials [1,2]. SiC and Alumina are mostly utilized compared to other synthetic reinforcing particulates. SiC particulates reinforced AMCs are well-known for high strength and wear resistance compared to traditional alloys [4,16]. Increase in volume of SiC and its size decreases the specific wear rate of AA6061/SiC composites [5-7]. Both mechanical strength and wear resistance of Al alloy increases with increase in SiC particulates [18,19]. Self lubricating (Gr, MoS2) particulates are well suited to this application, and their addition improves the machinability and wear resistance of Al–SiC composites [8,9,20,21]
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