High Temperature Friction and Wear Properties of Squeeze Cast (SiC w +CNTs)/2024Al Composites

Author of the article:ZHANG Jiajia, ZHANG Jidong, YAN Ruifang, QIAN Mingfang, ZHANG Xuexi, GENG Lin

Author's Workplace：School of Materials Science and Engineering

Key Words： squeeze casting; hybrid reinforcement; (SiC w +CNTs)/2024Al composites; high temperature friction and wear

Abstract： Aluminum matrix composites are ideal materials for lightweight brake components due to their low density, high hardness, high strength and wear resistance. In this study, (SiC w +CNTs)/2024Al composites with excellent wear resistance were prepared by squeeze casting and hot extrusion. The wear resistance of the composites was investigated under different loads (5~20 N) at high temperature (200 ℃) using dry sliding friction and wear experiments. The results show that compared with 2024Al, the composites have a high and stable friction coefficient and low wear rate at low loads and high temperatures, while the friction coefficient of composites decreases significantly and fluctuates at high loads. With increasing load, SiC w and CNTs are extracted, fully utilizing the self-lubricating ability of CNTs and the surface strengthening effect of hard SiC w , which significantly reduce the friction coefficient of 2024Al. Additionally, 2024Al is softened at high temperatures and adhesive wear occurres, while the presence of reinforcements in the composites effectively improves the high-temperature wear resistance.