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Mg_2Si_(0.4)Sn_(0.6)超微粉体的制备及机理研究

Preparation and Mechanism of Refinement of Mg_2Si_(0.4)Sn_(0.6) Powder
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摘要 以高纯Mg,Si,Sn粉为原料,采用固相反应合成方法制备得到单相Mg_2Si_(0.4)Sn_(0.6)固溶体粉体,再采用机械球磨的方法对粉体进行细化。利用扫描电子显微镜和X射线衍射仪对不同工艺条件下球磨后的粉体进行形貌及物相分析,研究Mg_2Si_(0.4)Sn_(0.6)固溶体球磨过程中颗粒尺寸及组分的变化,认为球磨转速为370 r/min,20∶1的球料比,以正己烷为球磨介质,选用WC材质的球磨罐和硬质球,球磨时间30 h,可以得到颗粒尺寸为4~5μm左右的单相Mg_2Si_(0.4)Sn_(0.6)粉体。随着球磨时间的延长,氧化现象加剧,固溶体出现分相,出现Mg O和Sn的衍射峰。 Mechanical ball milling has been applied to refine the Mg_2Si_(0.4)Sn_(0.6) powder which fabricated by solid reaction synthesis from pure Mg,Si,Sn powder. X-ray diffraction method( XRD) and Scanning electronic microscope( SEM) have been used to detect the phase and micro structure of the refined powder. The results show that when the vial rotation speed of 370 r / min,balls to powder ratio was 20∶1 and milling time was 30 h,the size of the Mg_2Si_(0.4)Sn_(0.6) powder was 4-5 μm. However,with the extension of the ball milling time,Mg_2Si_(0.4)Sn_(0.6) decomposed into Mg O,Sn and other phase.
出处 《硅酸盐通报》 CAS CSCD 北大核心 2015年第12期3708-3711,共4页 Bulletin of the Chinese Ceramic Society
基金 湖北省自然科学基金(2013CFB356)
关键词 Mg2Si0.4Sn0.6固溶体 热电材料 球磨 分相 Mg2Si0.4Sn0.6 thermoelectric materials ball milling phase splitting
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