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Properties of ZrB 2 –SiC Ceramics by Pressureless Sintering
Author(s) -
Zhang Hui,
Yan Yongjie,
Huang Zhengren,
Liu Xuejian,
Jiang Dongliang
Publication year - 2009
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.1551-2916.2009.03039.x
Subject(s) - materials science , composite material , flexural strength , sintering , fracture toughness , microstructure , ceramic , scanning electron microscope , porosity , zirconium diboride , vickers hardness test , elastic modulus , thermal expansion
Pressureless sintering was used to densify ZrB 2 –SiC ultra‐high temperature ceramics. The physical, mechanical, thermal, electrical, and high temperature properties were investigated. This comprehensive set of properties was measured for ZrB 2 containing 20 vol% SiC in which B 4 C and C were used as the sintering aids. The three‐point flexural strength was 361±44 MPa and the elastic modulus was 374±25 GPa. The Vickers hardness and fracture toughness were 14.7±0.2 GPa and 4.0±0.5 MPa·m 1/2 respectively. Scanning electron microscopy studies of the microstructure of ZrB 2 –SiC showed that SiC particles were distributed homogenously in the ZrB 2 matrix with little residual porosity.