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首页> 外文期刊>Journal of Materials Engineering and Performance >Thermoelectric Properties of TiNiSn Half Heusler Alloy Obtained by Rapid Solidification and Sintering
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Thermoelectric Properties of TiNiSn Half Heusler Alloy Obtained by Rapid Solidification and Sintering

机译：通过快速凝固和烧结获得Tinisn Heal Heusler合金的热电性能

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摘要

Thermoelectric TiNiSn-based half Heusler compound reveals high Seebeck coefficient and electrical conductivity, leading to high power factor. As a consequence of the solidification path, TiNiSn single phase cannot be obtained directly from the liquid phase. Thus, a long annealing step is needed to homogenize the alloy. In this work, we present a new processing route for half Heusler compound formation, combining arc melting of pure elements, rapid solidification of the molten alloy and sintering. Rapid solidification of the molten alloy allows to obtain almost single TiNiSn phase, limiting the formation of the primary TiNi2Sn phase as a consequence of the deep undercooling of the liquid. The rapidly solidified alloy was ground to powder and sintered by open die pressing. As-sintered samples show a density around 95% of the theoretical value. Thermal cycling of the sintered samples shows evolution of the phases, suggesting that after sintering the sample is not in equilibrium yet. After the second thermal cycle thermoelectric properties become reproducible, indicating the attainment of the equilibrium. In conclusion, the proposed processing route allows to obtain dense TiNiSn in bulk form avoiding the time-consuming annealing step, typically used to homogenize this alloy after solidification.
机译：基于热电锡的半风塞式化合物揭示了高塞贝克系数和电导率，导致高功率因数。作为凝固路径的结果，不能直接从液相获得锡溶液单相。因此，需要长退火步骤均化合金均化。在这项工作中，我们为半风夹组化合物形成的新加工途径，结合了纯元的电弧熔化，熔融合金的快速凝固和烧结。熔融合金的快速凝固允许获得几乎单一的锡，限制初级TiNI2SN相的形成，因为液体的深过冷却。将迅速凝固的合金研磨成粉末并通过开放式压制烧结。烧结样品显示出约95％的理论值的密度。烧结样品的热循环显示阶段的演化，表明在烧结后，样品尚未处于平衡状态。在第二热循环热电性能变得可再现之后，表明达到平衡。总之，所提出的加工途径允许在散装形式中获得致密的锡，避免耗时的退火步骤，通常用于在凝固后均化该合金均质。

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