首页|Effects of Carbon Black on Microstructure and Mechanical Properties of Hot Pressed ZrB_2-SiC Ceramics
Effects of Carbon Black on Microstructure and Mechanical Properties of Hot Pressed ZrB_2-SiC Ceramics
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Trans Tech Publications Ltd
ZrB_2-SiC ultra-high temperature ceramics (UHTCs) was hot-pressed at a temperature of 1900℃ with the addition of carbon black as a reinforcing phase. Microstructure and mechanical properties were investigated. Analysis revealed that the amount of carbon black had a significant influence on the sinterability and mechanical properties of ZrB_2-SiC ceramics. When a small amount ( < 10 vol.%) of carbon black was introduced, it may react with oxide impurities (i.e. ZrO_2, B_2O_3 and SiO_2) present on the surface of the starting powder, thus promote the densification and grain refining of ZrB_2-SiC ceramics. As a result, the mechanical properties including flexural strength and fracture toughness were improved. However, with the further adoption of carbon black, mechanical properties were not improved much, which could be attributed to the redundant phase at grain boundaries. The results presented here point to a potential method for improving densification, microstructure and mechanical properties of ZrB_2-based ceramic composites.
ZrB_2-SiC UHTCscarbon blackmechanical proper
Xin Sun、Xinghong Zhang、Zhi Wang、Wenbo Han、Changqing Hong
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Center for Composite Materials, Harbin Institute of Technology, Harbin 150001, PR China
NETL
NSTL
Trans Tech Publications Ltd
