기계적 합금법에 의한 Mg3Bi2와 Mg3Sb2 화합물 및 복합체의 제조
Fabrication of Mg3Sb2 and Mg3Bi2 Compounds and their composites by mechanical alloying
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초록
기계적 합금법을 이용하여 Mg, Sb, Bi을 planetary 볼밀에서 24~48시간 볼 밀링하여 Mg3Sb2와 Mg3Bi2 단일 결정상의 합금분말을 얻었다. 출발조성은 Mg3Sb2상의 경우 3Mg : 1.8Sb, Mg3Bi2상은 3Mg : 1.6Bi이었다. 얻어진 두 합금 분말을 여러 비율로 혼합하여 70 MPa의 압력 하, 723 K에서 1시간 가압소결하여 Mg3Sb2-Mg3Bi2 복합체를 제조하였다. 복합체의 주 결정상은 Mg3Bi2상과 유사한 안정한 상이었고 미량의 Bi상이 존재하였다. EDS 맵핑결과 가압소결체들의 조성분포는불연속적이며 독립적으로 나타나서 Mg3Sb2-Mg3Bi2계 복합체가 제조되었다는 것을 확인할 수 있었다.
Abstract
Single phase crystalline powders of Mg3Sb2 and Mg3Bi2 were prepared by mechanical alloying Mg, Sb and Bi metals with planetary ball milling for 24~48 h. The compositions of starting raw materials for single phase Mg3Sb2 and Mg3Bi2 were 3Mg : 1.8Sb and 3Mg : 1.6Bi, respectively. Two types of mechanically alloyed powders obtained were mixed at some ratios for the fabrication of Mg3Sb2-Mg3Bi2 composites and then hot pressed under uniaxial pressure of 70 MPa at 723 K for 1 h. The main phase of composites was a stable phase similar to Mg3Bi2 phase with a small amount of Bi phase. The distributions of Sb and Bi elements on EDS mapping images were discontinuous and their compositional contours were clear, which means that the hot pressed specimens were composites composed of two compounds of Mg3Sb2 and Mg3Bi2.
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