Microstructure and Wear Properties of Bi-continuous Interpenetrating Structure SiC3D/7050 Al
LI Yichao1,2,3, YU Liang1,2,3, JIANG Yanli1,2,3,*
1 School of Materials Science and Engineering, Guilin University of Technology, Guilin 541004, Guangxi, China 2 Key Lab of New Processing Technology for Nonferrous Metals and Materials Ministry of Education, Guilin 541004, Guangxi, China 3 Collaborative Innovation Center for Exploration of Nonferrous Metal Deposits and Efficient Utilization of Resources, Guilin 541004, Guangxi, China
Abstract: This work successfully fabricated a SiC3D/7050 Al with a bi-continuous interpenetrating structure by combining SiC3D foam and 7050 Al through a pressureless melt infiltration process combined with ultrasonic assistance. The microstructure of the SiC3D/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 SiC3D/7050 Al is successfully synthesized at 850 ℃ for 2 h, exhibiting excellent interfacial bonding. Both the triangular hollow pores in SiC3D and the micropores within SiC3D struts are completely filled by the Al alloy solution. The metallic phase and SiC3D ceramics phase were interconnected and interlocked to form a bi-continuous interpenetrating structure. After T6 heat treatment, the compressive strength of SiC3D/7050 Al increases from 286 MPa to 324 MPa, demonstrating excellent mechanical performance. Compared with 7050 Al, the wear volume and wear rate of SiC3D/7050 Al show a significant reductions. The wear rate (δ) of SiC3D/7050 Al increases from 1.22×10-13 m3/(N·m) to 1.72×10-13 m3/(N·m) as the load rose from 50 N to 100 N at 200 r/min. The δ increases from 1.37×10-13 m3/(N·m) to 1.86×10-13 m3/(N·m) under the same load range at 400 r/min. The significant reduction in the wear rate of SiC3D/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 SiC3D, as well as the refinement of the microstructure in the 7050Al matrix.
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2026, Vol. 40 
