In-situ nanodiamond to carbon onion transformation in metal matrix composites
In-situ nanodiamond to carbon onion transformation in metal matrix composites
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DOI：
10.1016/j.carbon.2017.12.072
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发表时间：
2018-04
期刊：
影响因子：
10.9
通讯作者：
S. Suárez;L. Reinert;M. Zeiger;P. Miska;Samuel Grandthyll;F. Müller;V. Presser;F. Mücklich
中科院分区：
文献类型：
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作者：
S. Suárez;L. Reinert;M. Zeiger;P. Miska;Samuel Grandthyll;F. Müller;V. Presser;F. Mücklich
在本研究中，以纳米金刚石（6.5 vol%）为增强相的镍基复合材料在750 ℃~ 1300 ℃的不同温度下进行真空退火。这是为了评估纳米金刚石在先前致密的复合材料中向碳洋葱的原位转化。通过互补的分析方法，包括拉曼光谱、透射电子显微镜、扫描电子显微镜、能量色散x射线能谱和x射线光电子能谱，对所得材料进行了彻底的分析。提出的原位变换方法有两个主要优点。一方面，由于纳米金刚石增强复合材料的颗粒分布明显比碳洋葱均匀，因此预计转化后的颗粒将保留纳米金刚石的初始分布特征。另一方面，所提出的过程允许通过应用一个简单的后处理步骤来调整sp3/sp2碳比。
In the present study, nickel matrix composites reinforced with a fine distribution of nanodiamonds (6.5 vol%) as reinforcement phase are annealed in vacuum at different temperatures ranging from 750 °C to 1300 °C. This is carried out to evaluate the in-situ transformation of nanodiamonds to carbon onions within a previously densified composite. The resulting materials are thoroughly analyzed by complementary analytical methods, including Raman spectroscopy, transmission electron microscopy, scanning electron microscopy, energy dispersive X-ray spectroscopy and X-ray photoelectron spectroscopy. The proposed in-situ transformation method presents two main benefits. On one hand, since the particle distribution of a nanodiamond-reinforced composite is significantly more homogenous than in case of the carbon onions, it is expected that the transformed particles will preserve the initial distribution features of nanodiamonds. On the other hand, the proposed process allows for the tuning of the sp3/sp2carbon ratio by applying a single straightforward post-processing step.