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Microstructure and Mechanical Properties of Zirconium Diboride Obtained by Aqueous Tape Casting Process and Hot Pressing
Author(s) -
Lü Zhihui,
Jiang Dongliang,
Zhang Jingxian,
Lin Qingling
Publication year - 2010
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/j.1551-2916.2010.04015.x
Subject(s) - materials science , microstructure , flexural strength , composite material , relative density , sintering , hot pressing , fracture toughness , zirconium diboride , grain size , ceramic , scanning electron microscope , vickers hardness test , tape casting , grain boundary , metallurgy
Aqueous ZrB 2 suspensions with different content of B 4 C were prepared for tape casting. After drying, the green tapes were laminated and hot pressed. It was shown that the mechanical properties of the sintered bodies increased with the increase in B 4 C content, while the ZrB 2 grain size decreased correspondingly. High sintering temperature also results in ZrB 2 ceramics with higher relative density and larger grain size. The ZrB 2 samples with 8 wt% B 4 C sintered at 1900°C had a relative density of 95.9 ± 2.0% and an average grain size of 2.80 ± 0.98 μm. The flexural strength, elastic modulus, Vickers hardness, and fracture toughness were 512.4 ± 63.9 MPa and 378.5 ± 43.7, 16.5 ± 0.7 GPa, and 2.76 ± 0.11 MPa·m 1/2 , respectively. Scanning electron microscopy and transmission electron microscopy showed a fine and homogeneous microstructure with a clear grain boundary. The fracture mode was mainly intragranular type.