TEM analysis, mechanical characterization and oxidation resistance of a highly refractory ZrB2 composite
TEM analysis, mechanical characterization and oxidation resistance of a highly refractory ZrB2 composite
复制标题
DOI：
10.1016/j.jallcom.2014.02.133
复制
发表时间：
2014-07
影响因子：
6.2
通讯作者：
L. Silvestroni;D. Sciti
中科院分区：
文献类型：
--
作者：
L. Silvestroni;D. Sciti
The microstructure of a dense ultra-high-temperature ceramic, namely ZrB2containing 15 vol% of WSi2, was characterized by X-ray diffraction, scanning and transmission electron microscopy. ZrB2displayed a core–shell structure: the core was constituted by the original MB2grain and the shell by a (Zr,W)B2solid solution which grew epitaxially on the core. According to the final microstructure with mixed Zr,W-silicides, -borides and -carbides at the triple points and clean grain boundaries, a densification mechanism for ZrB2in presence of WSi2is proposed. This composite displayed excellent thermo-mechanical properties, like strength retention of 84% at 1500 °C in air and moderate oxidation up to 1650 °C. Correlation between microstructure and properties are here presented in relationship to other ultra-refractory ceramics available in the literature.
