Ultrafast formation of Al <sub>2</sub> O <sub>3</sub> –Y <sub>3</sub> Al <sub>5</sub> O <sub>12</sub> eutectic ceramic by flash sintering
Jinling Liu, Xiangyu Xu, Dianguang Liu, Liying Chen, Ke Zhao, Linan An
Abstract
Abstract In this study, a dense Al 2 O 3 –Y 3 Al 5 O 12 (YAG) ceramic was synthesized by flash sintering a powder mixture of Al 2 O 3 and Y 2 O 3 in less than 150 seconds at a furnace temperature of 1350°C. The resultant ceramic has a well‐defined eutectic structure consisting of alternating Al 2 O 3 and YAG layers. The hardness and fracture toughness of the ceramic were measured to be 18.5 GPa and 4.3 MPa.m 1/2 , respectively. These values are comparable to those of similar eutectic ceramics made by directional solidification techniques. The results suggest a new method for making high‐performance eutectic ceramics, which could be applied in other systems.
Topics & Concepts
Eutectic systemCeramicMaterials scienceSinteringFlash (photography)Transparent ceramicsFracture toughnessComposite materialMetallurgyMineralogyMicrostructureOpticsChemistryPhysicsAdvanced ceramic materials synthesisMicrowave Dielectric Ceramics SynthesisNuclear materials and radiation effects