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原位法低溫合成MgB2的孔隙形成機(jī)制
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國家自然科學(xué)基金(50672077);國家“973”計劃(2006CB601004);陜西省自然科學(xué)基金(2006E101)


The Mechanism of Pore Formation in Superconducting MgB2 Synthesized at Low Temperature by In-Situ Process
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    摘要:

    采用XRD、SEM、DSC等分析測試方法,研究原位法低溫合成MgB2的孔隙形成機(jī)制。結(jié)果表明,高能球磨后B小顆粒鑲嵌在Mg大顆粒上,熱處理時MgB2相首先在Mg、B的鑲嵌區(qū)域生成。MgB2相生成過程中,閉孔隙主要是由Kirkendall效應(yīng)造成的,開孔隙形成的主要原因是Mg氣化后與B反應(yīng)形成了與環(huán)境保持連通的孔隙。

    Abstract:

    Using X-ray diffraction (XRD), scanning electron microscopy (SEM) and differential scanning calorimetry (DSC) the mechanism of pore formation of superconducting MgB2 synthesized at low temperature by in-situ process was studied. It is showed that B powder was embedded into Mg powder after the ball-milling process. MgB2 phase formed firstly in these embedded areas. The closed pores in MgB2 bulks are caused by kirkendall effect due to the different diffusion speeds of Mg and B atoms. The open pores are caused by Mg gas.

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吳怡芳,閆 果,閆世成,李成山,李金山,盧亞鋒.原位法低溫合成MgB2的孔隙形成機(jī)制[J].稀有金屬材料與工程,2009,38(4):647~650.[Wu Yifang, Yan Guo, Yan Shicheng, Li Chengshan, Li Jinshan, Lu Yafeng. The Mechanism of Pore Formation in Superconducting MgB2 Synthesized at Low Temperature by In-Situ Process[J]. Rare Metal Materials and Engineering,2009,38(4):647~650.]
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  • 收稿日期:2008-04-10
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