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In situ hot‐pressed ZrB 2 ‐based composite with polycarbosilane‐derived SiC: Microstructure and mechanical behavior
Author(s) -
Guo Shuqi
Publication year - 2019
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.16248
Subject(s) - materials science , microstructure , flexural strength , composite material , composite number , equiaxed crystals , scanning electron microscope , deformation (meteorology) , hot pressing , transmission electron microscopy , nanotechnology
In this study, a homogenously dispersed finer SiC particles‐containing ZrB 2 composite was prepared using nanosized polycarbosilane ( PCS ) particles‐containing ZrB 2 mixture powder, followed by hot pressing. The microstructure of the resulting composite was characterized by field‐emission scanning electron microscopy and transmission electron microscopy. The composite microstructure comprised finer equiaxed ZrB 2 and SiC grains. The mechanical behavior of the composite was evaluated using four‐point bending test at different temperatures between room temperature ( RT ) and 1600°C. The results show that the composite exhibited only linear deformation behavior prior fracture at or below 1500°C. However, a trace quantity of nonlinear deformation was observed at 1600°C. In addition, the flexural strength of the composite decreased as the temperature increased from RT to 1200°C, then the strength increased as the temperature raised to 1400°C. Subsequently, the flexural strength remained almost the constant between 1400°C and 1600°C, with a strength of ~760 MP a.