摘要
通过无压熔渗配合超声辅助工艺,将SiC_(3D)泡沫陶瓷和7050铝合金复合,制备成具有双连通互穿结构的复合材料。研究了SiC_(3D)/7050 Al复合材料的微观结构,并利用盘销式摩擦磨损试验机测试了不同转速和载荷下复合材料的摩擦性能。结果表明,无压熔渗时,7050 Al溶液在850℃保温2 h条件下,成功制备出SiC_(3D)/7050 Al复合材料。SiC_(3D)和7050 Al界面结合良好,SiC_(3D)的三角形空心孔和SiC_(3D)支柱中的微孔被完全填充,金属相与SiC_(3D)陶瓷相互连互锁形成双连通互穿结构。SiC_(3D)/7050 Al经T6热处理后抗压强度由286 MPa提升至324 MPa,力学性能表现良好。与7050 Al相比,SiC_(3D)/7050 Al的摩擦体积和磨损率显著降低。转速为200 r/min时,载荷从50 N增加到100 N,SiC_(3D)/7050 Al的磨损率(δ)仅从1.22×10^(-13) m^(3)/(N·m)增加到1.72×10^(-13) m^(3)/(N·m)。转速为400 r/min时,载荷从50 N增加到100 N,SiC_(3D)/7050 Al的δ仅从1.37×10^(-13) m^(3)/(N·m)增加到1.86×10^(-13) m^(3)/(N·m)。SiC_(3D)/7050 Al的磨损率显著降低的原因是SiC_(3D)与7050 Al摩擦表面的机械混合层交替进行磨损形成协同效应以及7050 Al基体的显微结构细化。
This work successfully fabricated a SiC_(3D)/7050 Al with a bi-continuous interpenetrating structure by combining SiC_(3D)foam and 7050 Al through a pressureless melt infiltration process combined with ultrasonic assistance.The microstructure of the SiC_(3D)/7050 Al and the friction properties of the composites under different rotational speeds and loads using a pin-on-disc friction and wear test apparatus were systematically investigated.The results demonstrate that the SiC_(3D)/7050 Al is successfully synthesized at 850℃for 2 h,exhibiting excellent interfacial bonding.Both the triangular hollow pores in SiC_(3D)and the micropores within SiC_(3D)struts are completely filled by the Al alloy solution.The metallic phase and SiC_(3D)ceramics phase were interconnected and interlocked to form a bi-continuous interpenetrating structure.After T6 heat treatment,the compressive strength of SiC_(3D)/7050 Al increases from 286 MPa to 324 MPa,demonstrating excellent mechanical performance.Compared with 7050 Al,the wear volume and wear rate of SiC_(3D)/7050 Al show a significant reductions.The wear rate(δ)of SiC_(3D)/7050 Al increases from 1.22×10^(-13) m^(3)/(N·m)to 1.72×10^(-13) m^(3)/(N·m)as the load rose from 50 N to 100 N at 200 r/min.Theδincreases from 1.37×10^(-13) m^(3)/(N·m)to 1.86×10^(-13) m^(3)/(N·m)under the same load range at 400 r/min.The significant reduction in the wear rate of SiC_(3D)/7050 Al is attributed to the synergistic effect formed by the alternating wear of the mechanical mixed layer(MML)on 7050 Al matrix friction surfaces and the SiC_(3D),as well as the refinement of the microstructure in the 7050Al matrix.
作者
李艺超
喻亮
姜艳丽
LI Yichao;YU Liang;JIANG Yanli(School of Materials Science and Engineering,Guilin University of Technology,Guilin 541004,Guangxi,China;Key Lab of New Processing Technology for Nonferrous Metals and Materials Ministry of Education,Guilin 541004,Guangxi,China;Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources,Guilin 541004,Guangxi,China)
出处
《材料导报》
北大核心
2026年第3期140-146,共7页
Materials Reports
基金
广西创新驱动发展项目(AA17204021)。
