Microstructure and Mechanical Properties of Mg Matrix Composites Reinforced with Nano-TiB2 Coated Continuous Carbon Fibers
WU Jiahong1,2, WANG Wenguang2,3,*, NI Dingrui2, XIAO Bolv2, LI Rongde1, LIN Nan4, WU Qiusheng4, XIA Jin4
1 School of Materials Science and Engineering, Shenyang University of Technology, Shenyang 110870, China 2 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China 3 School of Mechanical Engineering, Liaoning Petrochemical University, Fushun 113001, Liaoning, China 4 Shanghai Electro-Mechanical Engineering Institute, Shanghai 201109, China
Abstract: The surface of M55J continuous carbon fibers (Cf) was modified with TiB2 nano-coating, using a combination method of sol-gel and carbot-hermal reduction. At first, TiO2 sol (0.2 mol/L) doped with ammonium pentaborate was prepared as the source of TiO2 and B element, and the molar ratio of Ti to B was 1∶2, and then the doped sol was coated on the surface of Cf. After sintering at 1 350 ℃ for 120 min, the in-suit TiB2 could be formed on the surface of Cf, according to the XPS analysis. Following, 40vol% and 50vol% Cf reinforced Mg matrix (Cf/Mg) composites were fabricated by pressure infiltration method, producing the bending strengths of 720 MPa and 870 MPa, respectively. In contrast, the Mg matrix could not be infiltrated into the uncoated Cf preform. The observation of high-resolution transmission electron microscopy (HRTEM) indicated that the interfacial layer in thickness of 20—30 nm is composed of TiB2 and a small quantity of TiC and TiO2 nanoparticles. It is indicated that in-suit TiB2 coating on Cf could improve the wettability between Cf and Mg matrix, and increase the mechanical properties of Cf/Mg compo-site.
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2023, Vol. 37 
