Investigation of graphite effect on the mechanical and tribological properties of Al 7075-SiC-graphite hybrid metal matrix composites

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.

Tribological studies of different bioimplant materials for orthopedic application using Taguchi experimental design

“…The formed fragmented oxide layer or particles sometimes acts as a lubricating agent and thus this oxide layer reduces weight loss. From literature, it was found that in titanium alloy at higher load and sliding distance there was the formation oxide islands or layers [24,25,26,27]. But in this research, we did not see any metal oxide formation for mentioned process parameter except for SS316L material.…”

Influence of Nano-Silica in Al6061 Composites on Mechanical and Material Properties prepared through Powder Metallurgy

“…The sacri cial yield strength of 8% for AlSi-10 was not remarkable with gain of hardness value to 21% when compared with AlSi-0 composite were represented in gure 11. This was also due to the presence of hard and brittle particles of nano silica content [9,[22][23][24]. The presence of nano silica particles in the soft matrix of Al6061 created the hard and strong bonds.…”

Preparation and investigation of mechanical behavior and characterization of AA7475/ZrO2/Gr hybrid MMC

“…The graphite-containing hybrid composites showed better wear-resistance characteristics [3,4]. The AA7075 hybrid metal matrix composite reinforced with silicon carbide (SiC) ceramic material has good mechanical properties and graphite influences the wear behavior using powder metallurgy [5]. The reinforcement particulate is used to improve the microhardness and surface roughness of nanohybrid metal matrix composites.…”