Mechanical properties of biomimetic ceramic with Bouligand architecture
Yumin An, Yi Yang, Yongna Jia, Wenbo Han, Yehong Cheng
Abstract
Abstract Biomimetic Bouligand architecture is constructed in the ceramic to improve its toughness. Firstly, unidirectional carbon fiber‐reinforced ZrB 2 ‐SiC ceramic films are achieved through a vacuum‐assisted filtration method using graphene oxide. Then, ceramic films are helically assembled at a fixed angle of 30° in the graphite die based on the fiber orientation. Finally, the spark plasma sintering method was utilized to densify helical assembly carbon fiber/ceramic films. By constructing Bouligand structure, high fracture toughness (7.4 MPa·m 0.5 ) and work of fracture (∼1055 J/m 2 ) are achieved in ZrB 2 ‐based ceramic. The toughening mechanisms mainly are crack deflection, twisting and branching, carbon fiber pulling out, and bridging.