Diamond synthesis through the generation of plasma during spark plasma sintering
Diamond synthesis through the generation of plasma during spark plasma sintering
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DOI：
10.1002/pssa.201228317
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发表时间：
2012-11
期刊：
影响因子：
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通讯作者：
Faming Zhang;F. Ahmed;J. Bednarčík;E. Burkel
中科院分区：
文献类型：
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作者：
Faming Zhang;F. Ahmed;J. Bednarčík;E. Burkel
采用放电等离子烧结(SPS)技术，在极低的真空和Ar气氛中对碳纳米管基材料在金刚石表面进行了烧结。采用同步辐射X射线、拉曼光谱和扫描电子显微镜对烧结样品进行了物相分析和显微结构分析。在真空和Ar气氛中，碳纳米管/FeNi混合物在9.55兆帕的压力下在SPS过程中生成金刚石相。在此压力下，只有在Ar气氛中1200°C才能获得碳花和完美的金刚石晶体。这一结果为SPS过程中血浆的存在提供了间接证据。Ar气氛促进了等离子体的产生，从而促进了金刚石的转变。
Spark plasma sintering (SPS) of carbon nanotubes based materials to diamond was conducted at a very low pressure in vacuum and argon atmospheres. The phases and microstructures of the sintered samples were analyzed by Synchrotron X‐ray, Raman spectroscopy, and scanning electron microscopy. Diamond phases are created from carbon nanotubes/FeNi mixtures at pressure of 9.55 MPa in vacuum and argon atmospheres during SPS. At this pressure, carbon flowers, and perfect diamond crystals are obtained at 1200 °C only in the argon atmosphere. The consequences provide an indirect evidence for the existence of plasma during SPS. The argon atmosphere promotes the plasma generation and thus enhances the diamond transition.