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Fabrication and Characterization of ZrB 2 ‐Based Ceramic Using Synthesized ZrB 2 –LaB 6 Powder
Author(s) -
Spring Alex,
Guo WeiMing,
Zhang GuoJun,
Wang PeiLing,
Krstic Vladimir D.
Publication year - 2008
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.1551-2916.2008.02509.x
Subject(s) - materials science , ceramic , fracture toughness , composite material , microstructure , hot pressing , fabrication , zirconium diboride , flexural strength , ceramic matrix composite , medicine , alternative medicine , pathology
ZrB 2 –LaB 6 powder was obtained by reactive synthesis using ZrO 2 , La 2 O 3 , B 4 C, and carbon powders. Then ZrB 2 –20 vol% SiC–10 vol% LaB 6 (ZSL) ceramics were prepared from commercially available SiC and the synthesized ZrB 2 –LaB 6 powder via hot pressing at 2000°C. The phase composition, microstructure, and mechanical properties were characterized. Results showed that both LaB 6 and SiC were uniformly distributed in the ZrB 2 matrix. The hardness and bending strength of ZSL were 17.06±0.52 GPa and 505.8±17.9 MPa, respectively. Fracture toughness was 5.7±0.39 MPa·m 1/2 , which is significantly higher than that reported for ZrB 2 –20 vol% SiC ceramics, due to enhanced crack deflection and crack bridging near SiC particles.