Influence of Hot Pressing Temperature and SiC Content on the Microstructure and Mechanical Properties of ZrB₂-SiC

Abstract:

The influence of hot pressing temperature and SiC content on the microstructure and mechanical properties of ZrB2-SiC ceramics was investigated. ZrB2 containing 20 volume percent SiC were prepared by hot pressing at 1850, 1900 and 1950°C for 60 min. Fully dense ceramic was obtained after hot pressing at temperature of 1950°C. In addition, the materials with SiC content of 0, 10vol.%, 15 vol.%, 20 vol.% and 30 vol.% hot pressed at 1950°C were also investigated. Results showed that the grain size of the ZrB2 significantly reduced on adding 10vol.% SiC and then decreased slightly with further increasing SiC content, whereas the grain size of SiC exhibited a opposite trend. The flexural strength of ZrB2-SiC ceramics remarkedly increased on adding 10vol.% SiC due to the significant decrease of ZrB2 particle size and then slightly increased with increasing SiC content up to 20vol.%. However, further increasing SiC content led to a reduction of the flexural strength.

• Periodical: Key Engineering Materials (Volumes 434-435)
• Pages: 189-192
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.434-435.189
• Online since: March 2010
• Authors: Yong Zhang, Ping Hu, Xing Hong Zhang
• Keywords: Mechanical Property, Microstructure, Silicon Carbide (SiC), ZrB₂

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DOI: 10.1007/s10853-006-1274-2