Simultaneously enhancing mechanical and tribological properties of carbon fiber composites by grafting SiC hexagonal nanopyramids for brake disk application

doi:10.1016/j.jmst.2021.12.050

Abstract

Abstract:

Extensive attention has been drawn to the development of carbon fiber composites for their application in brake disks due to the increasing demand for brake disks with high mechanical strength and better tribological properties. Herein, we design SiC hexagonal nanopyramids modified carbon/carbon (SiCNPs-C/C) composites, in which SiCNPs are radially grafted on the carbon fibers by the combined sol-gel and carbothermal reduction method, and pyrolytic carbon (PyC) matrix is deposited on nucleation sites including carbon fibers and SiCNPs by isothermal chemical vapor infiltration (ICVI). Benefiting from the special structure, SiCNPs-C/C composites exhibit superior mechanical and frictional performance. Compared with C/C composites, SiCNPs-C/C composites have 147%, 90.3%, 70.6%, and 117.9% improvement in the hardness, interlaminar shear strength, and out-of-plane and in-plane compressive strength, respectively, which is attributed to the optimized fiber/matrix (F/M) interfaces bonding and the enhanced cohesion strength of PyC matrix. In addition, the friction coefficient of SiCNPs-C/C composites increases by 25.5%, and the wear rate decreases by 38.0%. This work provides an optional design thought for the nanomaterials and enlightens the mechanical and frictional modification of composites in the field of the brakes.

Key words: SiC hexagonal nanopyramids, Carbon/carbon composites, Microstructure, Mechanical properties, Tribological properties

Yao Guo, Leilei Zhang, Qiang Song, Ruonan Zhang, Fei Zhao, Wei Li, Hongchao Sheng, Xianghui Hou, Hejun Li. Simultaneously enhancing mechanical and tribological properties of carbon fiber composites by grafting SiC hexagonal nanopyramids for brake disk application[J]. J. Mater. Sci. Technol., 2022, 121: 1-8.

Figures/Tables 7

Fig. 1. (a) Fabrication procedure of SiCNPs-C/C composites; (b) the corresponding SEM and digital images of the samples of three stages.

Fig. 2. (a) XRD pattern and (b, c) SEM images of SiCNPs grafted CFP, (d) enlarged SEM image, (e) TEM and EDS mapping images, (f) HRTEM and SAED images of SiCNPs.

Fig. 3. (a) Schematic of the structure change of PyC matrix with the different deposition times, (b, c) TEM and EDS mapping images of SiCNPs deposited with PyC, (d) SEM and (e) PLM images of SiCNPs-C/C composites.

Fig. 4. (a) Load-depth curves and (b) hardness and elasticity modulus of PyC and SiCNPs modified PyC.

Fig. 5. (a) Interlaminar shearing, (b) out-of-plane compressive, and (c) in-plane compressive stress-strain curves of C/C and SiCNPs-C/C composites, (d, e) SEM images of fracture surfaces of SiCNPs-C/C composites, (f) mechanical strengths of CNTs/SiCNWs-reinforced C/C composites reported in the literature.

Fig. 6. (a) Schematic of the reinforcing mechanism of radially grafted SiCNPs for C/C composites; (b, d, f, and h) four schematic of enhancement areas; (c, e, g, and i) corresponding SEM images of fractured SiCNPs-C/C composites.

Fig. 7. (a) Schematic of friction test, (b) dynamical friction coefficient, and (c) average friction coefficient and wear rate of C/C and SiCNPs-C/C composites under dry sliding, (d, e) SEM images of SiCNPs-C/C composites after wear, (f) 3D surface images of the wear position of SiCNPs-C/C composites.

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