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10.3390/cryst14110949
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Article

Surface Modification of Graphene Oxide and Its Strengthening and Toughening Mechanism for Alumina-Based Ceramic Materials

by
Yangyang Hu
1,*,
Zhenzhen Feng
1,
Yonghui Xie
1,
Hongyang Wang
1,
Qinglong Ji
1,
Jiaoni Wang
1 and
Chonghai Xu
2
1
School of Mechanical Engineering, Weifang Vocational College, Weifang 262737, China
2
School of Mechanical and Automotive Engineering, Qilu University of Technology (Shandong Academy of Sciences), Jinan 250353, China
*
Author to whom correspondence should be addressed.
Crystals 2024, 14(11), 949; https://doi.org/10.3390/cryst14110949
Submission received: 25 September 2024 / Revised: 26 October 2024 / Accepted: 29 October 2024 / Published: 31 October 2024
(This article belongs to the Special Issue Advanced Technologies in Graphene-Based Materials (2nd Edition))
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Abstract

This study investigated the effects of incorporating reduced-graphene-oxide-coated alumina (Al2O3–RGO) nanoparticles and unmodified graphene oxide (GO) onto the microstructure as well as the mechanical properties of Al2O3/TiB2 matrix ceramic materials. The microstructure observation revealed that, compared with GO addition, the addition of Al2O3–RGO nanoparticles significantly improved RGO dispersion in the ceramic materials and reduced defects such as pores caused by graphene agglomeration. In addition, the uniformly dispersed RGO nanosheets were interwoven with each other to form a three-dimensional grid structure due to grain growth and the disappearance of pores during sintering, which increased the contact area and interface-bonding strength between the RGO and ceramic matrix. According to the results of microstructure observation and analysis, the good interfacial strength not only facilitated load transfer from the ceramic matrix to the RGO but also induced the fracture mechanism of the RGO, which consumes more fracture energy than the traditional toughening mechanism. The results of mechanical properties analysis showed that the hardness, flexural strength, and fracture toughness of the obtained ATB–RG3.0 ceramic material was measured at 19.52 GPa, 1063.52 MPa, and 9.16 MPa·m1/2, respectively. These values are 16.82%, 27.92%, and 26.87% higher than those of the ceramic material with 3.0 vol.% GO.
Keywords: ceramic materials; microstructure; interfacial bonding; mechanical properties; enhancement mechanism ceramic materials; microstructure; interfacial bonding; mechanical properties; enhancement mechanism

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MDPI and ACS Style

Hu, Y.; Feng, Z.; Xie, Y.; Wang, H.; Ji, Q.; Wang, J.; Xu, C. Surface Modification of Graphene Oxide and Its Strengthening and Toughening Mechanism for Alumina-Based Ceramic Materials. Crystals 2024, 14, 949. https://doi.org/10.3390/cryst14110949

AMA Style

Hu Y, Feng Z, Xie Y, Wang H, Ji Q, Wang J, Xu C. Surface Modification of Graphene Oxide and Its Strengthening and Toughening Mechanism for Alumina-Based Ceramic Materials. Crystals. 2024; 14(11):949. https://doi.org/10.3390/cryst14110949

Chicago/Turabian Style

Hu, Yangyang, Zhenzhen Feng, Yonghui Xie, Hongyang Wang, Qinglong Ji, Jiaoni Wang, and Chonghai Xu. 2024. "Surface Modification of Graphene Oxide and Its Strengthening and Toughening Mechanism for Alumina-Based Ceramic Materials" Crystals 14, no. 11: 949. https://doi.org/10.3390/cryst14110949

APA Style

Hu, Y., Feng, Z., Xie, Y., Wang, H., Ji, Q., Wang, J., & Xu, C. (2024). Surface Modification of Graphene Oxide and Its Strengthening and Toughening Mechanism for Alumina-Based Ceramic Materials. Crystals, 14(11), 949. https://doi.org/10.3390/cryst14110949

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