| 何祖明,冯旺军,江兴方,唐斌.MgB2掺杂纳米碳的淬熄实验过程研究[J].唐山学院学报,2016,29(3):59-62 |
| MgB2掺杂纳米碳的淬熄实验过程研究 |
| A Study on the Experimental Process of the Quenching of MgB2 Doped with Nanocarbon |
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| DOI：10.16160/j.cnki.tsxyxb.2016.03.017 |
| 中文关键词: MgB2掺杂纳米碳 淬熄法 结构形成 微观结构 反应机理 |
| 英文关键词: MgB2 doped with nanocarbon quenching method structure formation microstructure reaction mechanism |
| 基金项目:国家自然科学基金项目(61107055);江苏省高校自然科学研究面上项目(15KJD430004) |
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| 中文摘要: |
| 在锥形石墨模具内成功淬熄了MgB2掺杂纳米碳的实验,用X射线衍射仪(XRD)和扫描电子显微镜(SEM)对实验中不同反应区域试样的微观结构进行了分析。结果表明:520~650℃时,Mg和B颗粒接触表面发生了渗透方式的固-固反应,Mg的表面层初次形成了MgB2晶核;温度高于650℃时,发生剧烈的液-固放热反应生成了MgB2,并有少量MgB2分解形成MgB4和Mg,同时,有部分碳原子进入到MgB2晶格,替代B的位置,引起晶格畸变,从而产生有效的钉扎中心,并且部分纳米碳以杂相的形式存在于MgB2的晶界中,起到了细化晶粒的作用,增强了晶粒的连接性。 |
| 英文摘要: |
| The experiment in quenching MgB2 doped with Nanocarbon was successfully conducted in the conical graphite mould. X ray diffraction (XRD)and scanning electron microscopy (SEM) were used to analyze the microstructure of the samples in different reaction phases. The results indicated that solid-solid reaction happened on the contact surface of magnesium element and boron element in the osmotic way at 520 ~ 650 ℃, and the MgB2 crystal nuclei were formed on the surface layer of magnesium element, and that when the temperature was higher than 650 ℃,violent liquid-solid exothermic reaction occurred, MgB2 was generated, but a small amount of synthesized MgB2 was decomposed to form MgB4 and Mg. At the same time,some of the carbon atoms permeated into the MgB2 crystal lattice, partially replacing B atoms, which caused the lattice distortion and formed an effective pinning center. A small amount of nanocarbon in the form of mixed phase emerged in the grain boundary of MgB2, which played an important role in refining the grain size and enhanced the connectivity of grains. |
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