Fracture characteristics of SiC/graphene platelet composites

摘要

Silicon carbide/graphene platelet (SiC/GPLs) composites were prepared using different weight percent of GPLs filler by hot pressing (HP) technology at 2100 degrees C in argon. The influence of the GPLs addition on bending strength, fracture toughness and related fracture characteristics was investigated. Both the bending strength and fracture toughness increased with increasing GPLs additives..The main fracture origins strength degrading defects were pores at the low content of platelets and combination of pores and GPLs or clusters of GPLs particles in systems with a higher content of platelets. The fracture toughness increased due to the activated toughening mechanisms mainly in the form of crack bridging and crack branching, while the crack deflection was limited. The highest fracture toughness of 4.4 MPa m(1/2) was achieved at 6 wt.% of GPLs addition, which was similar to 30% higher than the K-IC value of the reference material. (C) 2017 Elsevier Ltd. All rights reserved.