Sintering and mechanical properties of carbon bulks from ordered mesoporous carbon and nano diamond
Sintering and mechanical properties of carbon bulks from ordered mesoporous carbon and nano diamond
复制标题
有序介孔碳和纳米金刚石碳块的烧结和机械性能
DOI：
10.1007/s40145-022-0650-y
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发表时间：
2022-10
影响因子：
16.9
通讯作者：
Wan Jiang
中科院分区：
文献类型：
--
作者：
Bowen Miao;Junzhuo Wang;Jianlin Li;Shijia Gu;Lianjun Wang;Wan Jiang
粉末冶金是材料制备的重要方法。然而，由于碳材料的惰性，即使在高温（2000 °C）下，将粉末状碳烧结成物理上连贯的块状物也是一个巨大的挑战。提高碳粉的烧结活性是碳粉烧结成功的关键。在这里，有序介孔碳（OMC）被用作生产高度均匀的新型碳块的起始材料。在1800 °C烧结过程中，OMC巨大的比表面积极大地促进了碳原子的迁移，从而通过表面扩散机制促进了OMC的烧结。当添加纳米金刚石（ND）时，与金刚石到石墨的相变相关联的体积膨胀促进粉末压坯的致密化。OMC和来自ND的石墨洋葱之间的强连接赋予所制备的碳块体以优异的机械性能。目前的研究开创了一种在相对较低的温度下制备高强度碳材料的新方法。
AbstractPowder metallurgy is important in material preparation. Due to the inertness of carbon materials, however, sintering powdered carbon into physically coherent bulks has been a great challenge even at a high temperature (2000 °C). Improving the sintering activity of carbon powders is the key to the success of the consolidation of the carbon powders. Here ordered mesoporous carbon (OMC) is used as the starting material to produce highly homogeneous novel carbon bulks. During sintering at 1800 °C, the huge specific surface area of the OMC greatly promotes the migration of carbon atoms and thus the sintering of the OMC by surface diffusion mechanism. When nanodiamond (ND) is added, the volume expansion associated with the phase transformation of diamond to graphite facilitates the densification of the powder compacts. The strong connection between the OMC and the graphite onions derived from the ND bestows the as-prepared carbon bulks with excellent mechanical properties. The current research pioneers a novel way to prepare high-strength carbon materials at relatively low temperatures.
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影响因子：
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