Microstructure and anisotropy of mechanical properties of graphene nanoplate toughened Al2O3-based ceramic composites. Issue 14 (1st November 2016)

• Record Type: Journal Article
• Authors: Meng, Xianglong; Xu, Chonghai; Xiao, Guangchun; Yi, Mingdong; Zhang, Yubing
• Is Part Of: Ceramics international. Volume 42:Issue 14(2016)
• Page Start: 16090
• Page End: 16095
• Publication Date: 2016-11-01
• Subjects: Microstructure analysis -- Anisotropic mechanical properties -- Toughness and toughening -- Graphene nanoplates; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2016.07.121
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Graphene nanoplate (GNP)-toughened Al2 O3 -based ceramic composites were fabricated by the hot-pressing method. The ceramic composites prepared in this way exhibited anisotropy in their mechanical properties. The fracture toughness and flexural strength of the ceramic composites were measured in the vertical to hot-pressing direction (VHPD) and determined to be as high as 6.2 MPa m 1/2 and 461 MPa, respectively, with GNP contents of 0.75 vol%, which were improvements of 38% and 39%, respectively, over the values measured in the parallel to hot-pressing direction (PHPD). Scanning electron microscope (SEM) observations indicated that GNPs parallel to each other and perpendicular to the hot-pressing direction are the primary explanation for the mechanical property anisotropy. The energy release rate of the crack deflection was calculated, demonstrating the effect of the GNP orientation on the mechanical properties.