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首页> 外文会议>Powder Metallurgy World Congress amp; Exhibition(PM 2006); 20060924-28; Busan(KR) >Solid-State Synthesis of Mg_2X (X=Si, Ge, Sn and Pb) via Bulk Mechanical Alloying
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Solid-State Synthesis of Mg_2X (X=Si, Ge, Sn and Pb) via Bulk Mechanical Alloying

机译：块体机械合金固相合成Mg_2X（X = Si，Ge，Sn和Pb）

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摘要

Magnesium base alloys and compounds are attractive for various applications as a functional material. In particular, a series of binary system by Mg_2X (X = Si, Ge, Sn and Pb) has fascinated many researchers and engineers by its thermoelectric properties and semi-conductive performance. Many barriers in its processing rejects precise investigation of these types of semi-conductive compounds: high vaporizing pressure and mechanical adhesion of magnesium, reaction of germanium and tin with crucibles, and, difference of melting point among elements, X. Solid-state processing via the bulk mechanical alloying enables us to directly fabricate these Mg_2X semi-conductive materials in high density performs. The precise control of chemical composition leads to an investigation on the dilution and enrichment of X in Mg_2X. Two types of solid-state reactivity are introduced: e.g. synthesis of Mg_2Si from an elemental mixture Mg - Si, which is a nucleation-controlled process, while synthesis of Mg_2Sn from Mg - Sn is a diffusion-controlled process. The thermoelectricity of these Mg_2X is evaluated for discussion on the validity and effectiveness of this new PM route as a reliable tool for fabrication of thermoelectric compounds.
机译：镁基合金和化合物作为功能材料在各种应用中具有吸引力。特别是，Mg_2X的一系列二元体系（X = Si，Ge，Sn和Pb）的热电特性和半导体性能吸引了许多研究人员和工程师。其加工过程中的许多障碍都无法对这些类型的半导体化合物进行精确研究：高蒸发压力和镁的机械粘合性，锗和锡与坩埚的反应以及元素之间的熔点差，X。大块机械合金化使我们能够直接制造高密度性能的这些Mg_2X半导体材料。化学成分的精确控制导致对X在Mg_2X中的稀释和富集的研究。引入了两种类型的固态反应性：由元素混合物Mg-Si合成Mg_2Si是成核控制的过程，而从Mg-Sn合成Mg_2Sn是扩散控制的过程。对这些Mg_2X的热电性进行了评估，以讨论这种新的PM路线作为制造热电化合物的可靠工具的有效性和有效性。

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