Structural design and toughening mechanism of laminated graphene ceramic tool materials. Issue 22 (15th November 2021)

• Record Type: Journal Article
• Authors: Chen, Benshuai; Xiao, Guangchun; Yi, Mingdong; Zhang, Jingjie; Chen, Hui; Zhou, Tingting; Chen, Zhaoqiang; Xu, Chonghai
• Is Part Of: Ceramics international. Volume 47:Issue 22(2021)
• Page Start: 32264
• Page End: 32275
• Publication Date: 2021-11-15
• Subjects: Ceramic tool -- Laminated -- Graphene -- Mechanical properties -- Microstructure; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2021.08.121
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Based on the finite element model, laminated graphene ceramic tool materials were designed, and the effects of the number of layers and thickness ratio on the residual stress were investigated. According to the simulation design results, laminated Al2 O3 –TiB2 –graphene/Al2 O3 –TiN (ATBGN) ceramic tool materials with various structures were prepared using the spark plasma sintering process, and their mechanical properties and microstructures were studied and analyzed. The fracture toughness and flexural strength of ATBGN were 8.65 ± 0.18 MPa m 1/2 and 755 ± 25 MPa, respectively, which increased by 66.7% and 21.6%, respectively, compared to those of monolithic Al2 O3 –TiB2 ceramic. Under the synergistic action of graphene and residual compressive stress, the multiscale deflection of cracks and the change in fracture mode occurred, which made the substantial contribution to the improvement in mechanical properties.