Spark Plasma Sintering and Characterization of Graphene Platelet/Ceramic Composites

作者：Jiang, Kyle; Li, Jiran; Liu, Jian^*

来源：Advanced Engineering Materials, 2015, 17(5): 716-722.

DOI：10.1002/adem.201400326

• MECHANICAL-PROPERTIES
• CERAMIC COMPOSITES
• ALUMINA
• GRAPHITE

This paper reports a study on sintering and characterization of graphene platelet (GPL)-reinforced ceramic composites. Alumina (Al2O3) and zirconia (ZrO2) toughened Al2O3 (ZTA) composites reinforced with GPLs are fabricated, respectively, using spark plasma sintering. The microstructures and mechanical properties of the sintered samples are investigated. It is found that the addition of GPLs hinders the growth of the ceramic matrix grains and help form homogenous microstructures of the ceramic matrices. Agglomeration of GPLs occurs during the fabrication process and formation of GPL aggregates is impeded when ceramic powders of smaller particle size and a shorter milling process are used. Fracture toughness of the ceramic matrices is significantly improved by introducing GPLs. Approximately, a 26.4% and a 29% improvements in fracture toughness are achieved for GPL/Al2O3 and GPL/ZTA composites, respectively. The main toughening mechanisms induced by GPLs are pull-out and crack bridging.

• 出版日期2015-5
• 单位太原科技大学; 四川大学