TiB<sub>2</sub>纳米涂层改性碳纤维增强Mg基复合材料的微观结构及力学性能

doi:10.11896/cldb.22030117

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Abstract The surface of M55J continuous carbon fibers (C_f) 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 C_f. After sintering at 1 350 ℃ for 120 min, the in-suit TiB₂ could be formed on the surface of C_f, according to the XPS analysis. Following, 40vol% and 50vol% C_f reinforced Mg matrix (C_f/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 C_f 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 C_f could improve the wettability between C_f and Mg matrix, and increase the mechanical properties of C_f/Mg compo-site.

Key words： sol-gel carbothermal reduction TiB₂ nano-coating C_f/Mg composite mechanical property

Published: 25 July 2023 Online: 2023-07-24

CLC number:

TG148

Fund:National Key R & D Program of China (2021YFA1600704), Major Program of National Natural Science Foundation of China (52192594), and the National Natural Science Foundation of China (52120105001, 52192594, 52192595, 519131009).

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	Articles by authors
	WU Jiahong
	WANG Wenguang
	NI Dingrui
	XIAO Bolv
	LI Rongde
	LIN Nan
	WU Qiusheng
	XIA Jin

Cite this article:

WU Jiahong,WANG Wenguang,NI Dingrui, et al. Microstructure and Mechanical Properties of Mg Matrix Composites Reinforced with Nano-TiB₂ Coated Continuous Carbon Fibers[J]. Materials Reports, 2023, 37(14): 22030117-6.

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http://www.mater-rep.com/EN/10.11896/cldb.22030117 OR http://www.mater-rep.com/EN/Y2023/V37/I14/22030117

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