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Ultrafast formation of Al 2 O 3 –Y 3 Al 5 O 12 eutectic ceramic by flash sintering
Author(s) -
Liu Jinling,
Xu Xiang,
Liu Dianguang,
Chen Liying,
Zhao Ke,
An Linan
Publication year - 2020
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.17109
Subject(s) - eutectic system , materials science , ceramic , sintering , flash (photography) , transparent ceramics , fracture toughness , composite material , metallurgy , microstructure , mineralogy , optics , physics , chemistry
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.