Porous electrically conductive materials produced by Spark Plasma Sintering and hot pressing of nanodiamonds
Porous electrically conductive materials produced by Spark Plasma Sintering and hot pressing of nanodiamonds
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DOI：
10.1016/j.ceramint.2015.06.055
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发表时间：
2015-11
影响因子：
5.2
通讯作者：
A. Ukhina;D. Dudina;A. Anisimov;V. Mali;N. Bulina;I. Bataev;I. N. Skovorodin;B. Bokhonov
中科院分区：
文献类型：
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作者：
A. Ukhina;D. Dudina;A. Anisimov;V. Mali;N. Bulina;I. Bataev;I. N. Skovorodin;B. Bokhonov
已知纳米金刚石颗粒在退火时石墨化，逐渐转变成碳洋葱结构。这项工作的目的是评估纳米金刚石粉末作为原料的潜力，通过石墨化伴随的火花等离子烧结和热压来生产大块多孔导电材料。尽管固结与石墨化平行发生，但在具有高石墨化度的压块中观察到比表面积（高达510 m2 g-1）相对于纳米金刚石粉末（360 m2 g-1）的增加。在1200 °C下火花等离子烧结并在1500 °C下热压的压坯显示出高电导率，其比通过纳米金刚石石墨化生产的粉末的电导率高一个数量级，仅比块状石墨的电导率低40-50倍。基于这些结果，得出的结论是，通过放电等离子烧结和热压的纳米金刚石的固结可用于开发具有定制的比表面积的多孔导电材料。提出了放电等离子烧结过程中电流对纳米金刚石石墨化的可能影响。
Nanodiamond particles are known to graphitize upon annealing gradually transforming into carbon onion structures. The goal of this work was to evaluate the potential of nanodiamond powders as a raw material to produce bulk porous electrically conductive materials by means of graphitization-accompanied Spark Plasma Sintering and hot pressing. Despite consolidation that occurred in parallel to graphitization, an increase in the specific surface area (up to 510 m2g−1) relative to the nanodiamond powder (360 m2g−1) was observed in compacts with high graphitization degrees. Compacts Spark Plasma Sintered at 1200 °C and hot-pressed at 1500 °C showed high electrical conductivities, which were one order of magnitude higher than those of the powders produced by nanodiamond graphitization and only 40–50 times lower than that of bulk graphite. Based on these results, a conclusion was made that consolidation of nanodiamonds by Spark Plasma Sintering and hot pressing can be used for developing porous electrically conductive materials with tailored specific surface area. A possible influence of electric current on graphitization of nanodiamonds during Spark Plasma Sintering was suggested.