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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Effect of iron on mechanical activation and structural evolution of hematite-graphite mixture
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Effect of iron on mechanical activation and structural evolution of hematite-graphite mixture

机译：铁对赤铁矿-石墨混合物机械活化和结构演变的影响

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In this study the effect of iron on mechanical activation (MA) and structural evolution of hematite (H) and graphite (G) mixture has been investigated. Different amounts of iron powder (0-10 wt percent) were added to H-G mixture (with C/O=l). Then the H-G-iron mixtures were mechanically treated by a planetary ball mill for different time periods (0-10 h). X-ray diffraction (XRD) results demonstrated that a fraction of H particles reduces to magnetite (M) and G peaks completely disappear due to mechanical milling. In addition, H crystallite size and structural microstrain were obtained performing different procedures based on integral breadth analysis of obtained XRD patterns. The obtained results showed that H crystallite size decreases tremendously and its structural microstrain increases as a result of increasing milling time and iron intensifies these changes. Moreover, the concept of epsilon/d was proposed as the MA parameter. The variations in H amorphization degree and dislocation density were also investigated, showing the major impact of both milling time and iron content. Furthermore, scanning electron microscopy (SEM) studies were carried out in order to investigate the induced changes in the structure due to milling and also to study the effect of iron on structural evolution and its mechanism. SEM observations revealed that mechanical milling produces a compacted composite structure of particles. Additionally, MA in the presence of iron increases the stored energy in powder mixture. So, iron not only intensifies the induced changes in the structure but also accelerates the MA process.
机译：在这项研究中，研究了铁对机械活化（MA）和赤铁矿（H）和石墨（G）混合物的结构演变的影响。将不同量的铁粉（0-10重量％）添加至H-G混合物（C / O = 1）。然后，通过行星式球磨机对H-G-铁混合物进行机械处理不同的时间段（0-10小时）。 X射线衍射（XRD）结果表明，由于机械研磨，一部分H颗粒还原为磁铁矿（M），而G峰则完全消失。另外，基于获得的XRD图的积分宽度分析，通过不同的程序获得了H晶粒尺寸和结构微应变。所得结果表明，随着磨削时间的增加，H晶粒尺寸大大减小，结构微应变增加，铁强化了这些变化。此外，提出了ε/ d的概念作为MA参数。还研究了H非晶化程度和位错密度的变化，显示了铣削时间和铁含量的主要影响。此外，进行了扫描电子显微镜（SEM）研究，以研究由于铣削引起的结构变化，并研究铁对结构演变及其机理的影响。 SEM观察表明，机械研磨可产生紧密的颗粒复合结构。另外，MA在铁的存在下增加了粉末混合物中的存储能量。因此，铁不仅增强了结构的诱导变化，而且还加速了MA过程。

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