摘要
用搅拌铸造法制备不同质量分数二硼化钛(TiB_(2))颗粒增强的铝基复合材料,并研究其摩擦磨损性能。采用销−盘式摩擦试验机对Al2024−TiB_(2)复合材料进行干滑动磨损试验。为了研究摩擦学参数对复合材料的影响,对载荷、滑动距离和滑动速度等参数进行调整。显微组织表征结果表明,TiB_(2)颗粒分散均匀并与基体有良好的结合。实验结果表明,与Al2024合金相比,复合材料的摩擦磨损率更低,而Al2024合金和复合材料的磨损率均随载荷、滑动速度和滑动距离的增加而增加。然而,Al2024合金和复合材料的摩擦因数均随载荷的增大而减小,而随滑动速度和滑动距离的增大而增大。对磨损表面和磨屑的扫描电镜研究表明,耐磨性的提高归因于细小磨屑的形成。
Present work encapsulated the friction and wear behaviour of aluminium matrix composites reinforced with different mass fractions of titanium diboride(TiB_(2))particles,synthesized by stir casting.A pin on disc tribotester was employed for conducting the dry sliding wear tests of Al2024−TiB_(2)composites.The tests were performed adopting various parameters like load,sliding distance and sliding velocity for investigating the effect of tribological parameters on the prepared composites.Microstructural characterization confirmed uniform dispersion of TiB_(2)particles and good matrix−reinforcement bonding.Results of the experiments revealed that,low friction and wear rates were observed in the developed composites compared to Al2024 alloy,whereas wear rates of both Al2024 alloy and fabricated composites increased with the increase in load,sliding velocity and sliding distance.However,friction coefficient of both Al2024 alloy and fabricated composites reduced with the increase in applied load but rose with the increase in sliding velocity and sliding distance.SEM studies of the worn surfaces and debris depicted that enhancement in wear resistance can be ascribed to finer debris formation.
