首页|Microstructure and Mechanical Properties of Hot Pressed ZrC-SiC-ZrB_2 Composites
Microstructure and Mechanical Properties of Hot Pressed ZrC-SiC-ZrB_2 Composites
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Trans Tech Publications Ltd
Ternary ZrC-SiC-ZrB_2 ceramic composites were prepared by hot pressing at 1900℃ for 60 min under a pressure of 30 MPa in argon. The influence of ZrB_2 content on the microstructure and mechanical properties of ZrC-SiC-ZrB_2 composites was investigated. Examination of SEM showed that the microstructure of the composites consisted of the equiaxed ZrB_2, ZrC and SiC grains, and there was a slight tendency of reduction for grain size in ZrC with increasing ZrB_2 content. The hardness increased considerably from 23.3 GPa for the ZS material to 26.4 GPa for the ZS20B material. Flexural strength was a strong function of ZrB_2 content, increasing from 407 MPa without ZrB_2 addition to 627 MPa when the ZrB_2 content was 20vol.%. However, the addition of ZrB_2 has little influence on the fracture toughness, ranging between 5.5 and 5.7 MPam~(l/2).
ZrCceramicmicrostructuremechanical properties
Baoxia Ma、Wenbo Han、Xinghong Zhang
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Center for Composite Materials, Harbin Institute of Technology, Harbin 150001, China Department of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150040, China
Center for Composite Materials, Harbin Institute of Technology, Harbin 150001, China
NETL
NSTL
Trans Tech Publications Ltd
