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Outline
Combining high-energy ball milling and high-pressure high-temperature technique, high-dense ZrN-ZrB2 nanocomposites have been synthesized using Zr and h-BN powders as raw materials. The structures of product materials were studied through X-ray diffraction, high resolution transmission electron microscopy and Raman spectroscopy measurements. The result showed that only ZrNx can be synthesized during mechanical alloying process, which can be explained by the thermodynamics and kinetics of reaction of Zr atoms with N and B atoms. ZrN-ZrB2 nanocomposites synthesized at 5 GPa and 1 300 ℃ using 10 h ball-milled powder mixture show excellent mechanical and electrical properties. The microhardness, thermal expansion coefficient and thermal coefficient of resistivity of ZrN-ZrB2 composites are 17 GPa, 7.57×10-6 ℃-1 and 8.846×10-4 ℃-1, respectively.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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