Tribological Characteristics of LM13/Si3N4/Gr Hybrid Composite at Elevated Temperature
- 28 Downloads
LM13/12wt.%Si3N43wt.%Gr hybrid composite was fabricated by liquid metallurgy route and its tribological characteristics were tested using pin-on-disc tribometer. The experiments were conducted as per L27 orthogonal array to study the influence of process parameter at normal and elevated temperature (150 °C) by varying process parameters such as load (10, 20, 30 N), sliding velocity (1, 2, 3 m/s) and sliding distance (750, 1250, 1750 m). The results revealed that the wear rate at both temperatures was proportional to load due to the stress induced which fractures Si3N4 particles and stripes aluminium matrix. As the sliding velocity increases, wear rate showed an increasing trend due to three body abrasion from eroded Si3N4 grits. The wear rate was inversely proportional to sliding distance, because of MML (Mechanically mixed layer) formed from chemical reactions between tribo-layers. When load increases COF (Coefficient of friction) decreases then increases due to lubricating and tillage effect. As velocity and distance increases, COF decreases due to thermal softening, hardening of layer and also the lubrication effect produced by chemical reactions. Analysis of variance (ANOVA) and S/N ratio at room temperature and elevated temperature for both Wear rate and COF were developed to study the most significant parameters on corresponding responses. Confirmation experiments were conducted to validate multi-linear regression model. Worn surfaces were examined using scanning electron microscope (SEM) to investigate wear characteristics. Energy dispersive X-ray spectroscopy (EDAX) and X-ray diffraction (XRD) results confirmed the formation of MML and different phases formed during wear mechanism. The developed material can be used to fabricate cylinder liners, cylinder blocks and brake rotors.
KeywordsStir casting Mechanically mixed layer L27 Orthogonal array Analysis of variance
Unable to display preview. Download preview PDF.
- 2.Anthony M, Schultz BF, Pradeep R (2012) Metal matrix composites. Adv Mater Process 1:19–23Google Scholar
- 3.Saravanan C, Subramanian K, Sivakumar DB, Sathyanandhan M, Sankara Narayanan R (2015) Fabrication of aluminium metal matrix composite - a review. J Chem Pharm Sci 7:82– 87Google Scholar
- 4.Nassar AE, Nassar EE (2017) Properties of aluminum matrix Nano composites prepared by powder metallurgy processing. J King Saud Univ-Eng Sci 29:295–299Google Scholar
- 5.Vinoth KS, Subramanian R, Dharmalingam S, Anandavel B (2012) Mechanical and tribological characteristics of stir-cast Al-Si10Mg and self-lubricating Al-Si10Mg/MoS2 composites. Mater Technol 46:497–501Google Scholar
- 13.Radhika N, Balaji TV, Palaniappan S (2015) Studies on mechanical properties and tribological behaviour of LM25/SiC/Al2O3 composites. J Eng Sci Technol 10:134–144Google Scholar
- 21.Suryanarayana RC, Khan S, Koppad PG, Khan Z (2013) Tribological behaviour of the hot extruded Al6061-Si3N4 composite. ASME 2013 Int. Mech. Eng. Congress Exposition. ASMEGoogle Scholar
- 23.Devarajaiah RM, Suresha B (2016) Role of organo-modified montmorillonite nanoparticles on wet sand abrasion of carbon fabric reinforced epoxy composites. Ind J Eng Mater Sci 23:411–417Google Scholar
- 24.Al-Samarai RA, Haftirman AKR, Al-Douri Y (2012) Effect of load and sliding speed on wear and friction of aluminum – silicon casting alloy. Int J Sci Res Publ 2:1–7Google Scholar
- 27.Kumar V, Kumar J, Kumar S (2016) Study of wear behaviour of aluminium metal matrix composite reinforced with SiC. Int Res J Eng Technol 3:573–577Google Scholar