期刊
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
卷 82, 期 -, 页码 81-90出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrmhm.2019.03.025
关键词
WC-Al2O3 composites; Mechanical properties; Graphene platelets; Toughening mechanisms
To enhance the toughness of the WC-Al2O3 composite, graphene platelets (GPLs) were incorporated to this ceramic composite by using ball milling and hot pressing sintering. The influences of graphene on microstructure and mechanical properties of the WC-Al2O3 composites were investigated. Results of the experiments showed that the grain size of the composite first diminished and then increased gradually along with the increase of graphene content. Both the Vickers hardness and toughness increased first and then diminished along with the increase of graphene content. The optimized composite exhibited the highest Vickers hardness (18.78 GPa) and the highest fracture toughness (11.09 MPa.m(1/2)) at the indentation load of 294 N (30 kg) when incorporated with 0.3 wt% GPLs, which are about 18.7% and 40.8% higher than that of WC-Al2O3 without GPLs, respectively. However, the relative density of the WC-Al2O3 composites decreased stably along with the increase of graphene content. Agglomeration of GPLs and porosity were observed in the composites with high content, which weakened the properties. The toughening mechanisms are proposed to be crack deflection, crack bridging, graphene pull out and grain refinement.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据