| Reactive Synthesis of ZrB2-based Ultra High Temperature Ceramics |
| Hai-Tao Liu, Guo-Jun Zhang |
| State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics |
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| ABSTRACT |
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Reactive processing, such as reactive hot pressing (RHP) and reactive spark plasma sintering (R-SPS), is effective densification method to prepare $ZrB_2$-based ultra high temperature ceramics (UHTCs). The present paper reviewed some typical reactive processing of $ZrB_2$-based UHTCs. All the reactions from the starting materials in the reactive processing are thermodynamically favorable, which generate enough energy and driving force for the densification of the final products under a relatively low temperature. Besides, compared with non-reactive processing, anisotropic $ZrB_2$ grains, such as $ZrB_2$ platelets, can only be obtained in the reactive processing, resulting in an improvement of the mechanical properties. |
| Key words:
Zirconium diboride ($ZrB_2$), Ultra high temperature ceramics (UHTCs), Reactive processing, Reactive hot, pressing (RHP), Platelet |
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