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Sintering dense boron carbide without grain growth under high pressure
Author(s) -
Liu Lixin,
Li Xuhai,
He Qiang,
Xu Liang,
Cao Xiuxia,
Peng Xusheng,
Meng Chuanmin,
Wang Wenqiang,
Zhu Wenjun,
Wang Yuan
Publication year - 2018
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.15282
Subject(s) - sintering , materials science , boron carbide , grain growth , ceramic , fracture toughness , vickers hardness test , grain size , boron , metallurgy , abnormal grain growth , composite material , microstructure , chemistry , organic chemistry
Traditionally, densification and grain growth are two competing processes in sintering of ceramics. To improve the density, while limiting grain growth at the same time, an ultrahigh pressure (>1 GPa) is employed here and results in plastic deformation as the dominant densification mechanism during the sintering process. In this way, fully dense boron carbide (B 4 C) structural ceramics without grain growth is prepared under the pressure of 4.5 GPa at low temperature of 1300°C in 5 minutes, while showing excellent mechanical properties such as Vickers hardness of 38.04 GPa, Young's modulus of 487.7 GPa, and fracture toughness of 3.87 MPa·m 1/2 . This study should also facilitate the development of other structural ceramics for practical applications.