Comparative Study on Dry Sliding Wear Behaviour of Metal Matrix Hybrid Composites at Room and High Temperature Conditions

Abstract

In this present study, hybrid composites was used to fabricate Boron Carbide (B₄C) and Molybdenum disulfide (MoS₂) particles reinforced aluminium Al2219,to achieve wettablity among Al and B₄C the k₂TiF₆ halide salt was incorporated into Al 2219 alloy. The hybrid composites were successfully fabricated using stir casting technique and then casted samples were characterized by SEM examination. The microstructure examination demonstrate that uniform distribution of B₄C and MoS₂ particles in matrix Al2219.The monolithic Al2219 and prepared hybrid composites were subjected to Dry sliding wear test using pin-on disc tribometer as for ASTM G99-95 standard and comparative study between room temperature and high temperature(180⁰C) wear test under different sliding situation were done. The examination room result revels that, the specific wear rate at temperature was found lesser as compared to high-temperature 180⁰C and the specific wear rate was found to increase with applied loads and sliding distances in both conditions. For both room temperature and high temperature the hybrid composites had a lower specific wear rate when compared to Al2219.The specific wear rate increases with increases in load and sliding distance, the addition of reinforcing particles i.e B₄C and MoS₂ reduces specific wear rate of composites and the addition of secondary reinforcement MoS₂ has significant effect on reducing wear rate of prepared hybrid composites for both room temperature and high temperature. The worn surface of pin samples tested under both conditions were analyzed using SEM.