Nanocarbon-dependent synthesis of ZrB sub(2) in a binary ZrO sub(2) and boron system
Thermodynamically, ZrO sub(2) may react with boron to form B sub(2)O sub(3)/B sub(2)O sub(2) and ZrB sub(2) at room temperature. However, this reaction is incomplete at temperatures lower than 1550 degree C, even with the use of metastable reactants, i.e., as-synthesized amorphous hydrous nano-ZrO s...
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Veröffentlicht in: | Journal of alloys and compounds 2011-08, Vol.509 (34), p.8581-8583 |
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Hauptverfasser: | , , , , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Thermodynamically, ZrO sub(2) may react with boron to form B sub(2)O sub(3)/B sub(2)O sub(2) and ZrB sub(2) at room temperature. However, this reaction is incomplete at temperatures lower than 1550 degree C, even with the use of metastable reactants, i.e., as-synthesized amorphous hydrous nano-ZrO sub(2) and amorphous boron powders. In this study, a complete disintegration of ZrO sub(2) was achieved by introducing nanocarbon to the binary system of ZrO sub(2) and boron at 1550 degree C. The metastable reactants affected the temperature required for the solid-state reactions and also strongly affected the kinetics of the transformation. Single crystal and plate-like ZrB sub(2) particles with a uniform distribution and a size of ca. 1.0 mu m in two-dimensions were obtained using 5 wt.% nanocarbon and a B/Zr molar ratio of 4. |
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ISSN: | 0925-8388 |
DOI: | 10.1016/j.jallcom.2011.06.028 |