采用熔炼、退火结合放电等离子烧结的方法制备了名义成分为MnSix(x=1.60、1.65、1.68、1.73、1.81、1.85)的高锰硅(HMS,Higher Manganese Silicide)块体材料.物相分析结果表明,随着Si初始用量x的增加,HMS(Mn15Si26)相各衍射峰强度先增强后减弱.当x<1.73时,样品物相组成为HMS相和少量MnSi相,当x≥1.73时,样品物相组成为HMS相和少量Si相.体系的热电性能受MnSi相和Si相的影响,热电性能分析结果表明:随着Si名义含量x的增大,试样电导率逐渐降低,赛贝克系数逐渐增大,热导率先降低后增高.其中,名义成分为MnSi1.68的试样由于具有最高的电性能(功率因子)和较低的热导率,从而具有最好的热电性能,在400℃时其无量纲ZT值达到0.36.
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