The intrinsic properties of aluminium such as low density, high resistance to corrosion, better thermal conductivity and high strength to weight ratio made it suitable as a matrix material in MMC to fabricate components like automobile pistons, brake discs and automobile bodies
etc.,[1, 2]. However, the lower hardness and poor wear resistance of aluminium made limited applications in the tribological environment. Therefore, reinforcement particles were incorporated into the aluminium matrix to enhance the mechanical and tribological properties of the material . Reinforcing ceramic Al2O3, SiC, TiC and WC into the softer aluminium matrix enhance the wear resistance, creep and yield point of the material . Among available ceramic reinforcements, SiC reinforced MMC exhibits better mechanical and anti-wear characteristics . However, Incorporating single SiC reinforcement enhances the brittleness and C.O.F to the composite specimen. To eradicate this difficulty, ductile and self-lubricated secondary reinforcements were added to the aluminium matrix material . Despite all fabricating methods available, the Spark plasma sintering technique was adopted due to higher sintering rate, lesser porosity defects and the possibility of obtaining nearly net-shaped products [7, 8]. Amra et al.,  studied the wear and frictional behaviour of Al5083/CeO2/SiC HMMC and concluded that minimum wear rate of 4 × 10− 3 mm3/m obtained for Al5083/CeO2/SiC HMMC when compared to Al5083/SiC MMC due to the existence of self-lubricating property of the CeO2 reinforcement particles. Umanath et al.,  investigated dry sliding wear characteristics of Al6061/ SiC/Al2O3 HMMC against the counter steel disc. Results reveal that the 15 % reinforced HMMC exhibits superior anti-wear performance than the 5 % reinforced HMMC. In addition to this, the worn surface of the HMMC sample confirms the presence of tear ridges and cracked SiC and Al2O3 reinforcement particles indicating combined ductile and brittle fracture of HMMC specimen. Halil Karakoc et al.,  examined the wear behaviour of Al6061/SiC/B4C HMMC composite fabricated through powder metallurgy technique. Results concluded that a lower rate of 1.4 × 10− 13 mm3/m was achieved for the Al6061/9% B4C/3%SiC HMMMC for 100 m sliding distance at an applied load of 15 N. Mehta et al., studied the wear properties of aluminium and magnesium alloys under wet and dry lubricating environments and claimed that wear rate of the fabricated pin materials depends on the lubricating conditions. Further, to enhance the wear and thermal properties, nanofluids with nanoparticles of higher thermal conductivity were used as lubricants . Singh et al.,  studied the tribological behavior of Al6061/SiC/Gr HMMC under MWCNT-in-oil and surfactant functionalized MWCNT-in-oil lubricating conditions. Results reveal that wear rate of the HMMC pin specimen was reduced by 5 and 6 times respectively for the respective lubricating conditions due to the
formation of tribofilm and the enhanced retaining stability of the lubricants between the matting surfaces.
From the above literature, it was concluded that limited work was carried on the tribological behaviour of the aluminium HMMC reinforced with naturally available reinforcements. Kaoline is a naturally available clay material that contains oxides of Al, Si, Zn, Mg and Fe which improves the mechanical and anti-wear characteristics of the aluminium matrix . In addition to this, kaoline clay contains self-lubricating properties and the presence of magnesium in the kaoline clay improves the wettability between the interface particles . Therefore, In this present study, an attempt has been made to investigate the tribological behaviour of the Spark Plasma Sintered Al- SiC-Kaoline HMMC under the dry, wet and nanofluids with SiC nanoparticles lubricating conditions.