냉간 압축 성형한 Mg3Sb2 열전재료의 고상 반응 소결
Solid state reactive sintering of cold pressed thermoelectric Mg3Sb2
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초록
상온 압축 성형 후 고상 반응 소결 공정을 통하여 Mg3Sb2 소결체를 제조하고자 하였다. Mg과 Sb의 성분의 몰비와 반응온도에 따른 결정상의 변화를 조사하였다. 773~843 K에서 얻어진 고상반응 소결체들은 전형적인 Mg3Sb2 결정상을 형성하였으나 소결체의 위치에 따라 약간 다른 상적 구성을 보였다. 소결체 하단 부위에서 전형적으로 얻어지는 결정상이 얻어졌으며 823 K 온도에서는 Mg : Sb = 3.15 : 1.85 조성일 때, 843 K 온도에서는 Mg의 몰 수가 3.10 이상인 모든 조성에서 α-Mg3Sb2 상과 정확히 일치하는 결정상이 얻어졌다. 미량 남아있는 Mg 성분은 응고 후 냉각 시 α-Mg3Sb2 상으로부터 석출된 것으로 보인다.
Abstract
We intended to prepare Mg3Sb2 compound bodies through solid state reactive sintering after cold-pressingmixtures of elementary Mg and Sb powders and investigated the crystal phases of the sintered bodies according to Mg/Sbmole ratios and reaction temperatures. The Mg3Sb2 bodies sintered at the temperatures of 773~843 K showed typicalcrystalline phases of Mg3Sb2 compounds, but their diffraction angles in XRD patterns were slightly different along with thevertical axis of the bodies obtained. All the bottom parts of the sintered Mg3Sb2 bodies were composed of the typicalcrystalline phases of Mg3Sb2 compounds and their diffraction angles were completely in accord with those of the α-Mg3Sb2phase, when Mg : Sb = 3.15 : 1.85 at 823 K, or when the Mg moles were greater than or equal to 3.10 at 843 K. It wasconsidered that the slightly remaining Mg phases were formed by precipitation from α-Mg3Sb2 phases during thesolidification process of liquid phase.
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