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방전 플라즈마 소결에 의한 Ge<sub>2</sub>Sb<sub>2</sub>Te<sub>5</sub> 스퍼터링 타겟 제조 및 특성
방창욱,김기범,이진규,Bang, C.W.,Kim, K.B.,Lee, J.K. 한국분말야금학회 2014 한국분말재료학회지 (KPMI) Vol.21 No.2
In this study, we report the sintering behavior and properties of a $Ge_2Sb_2Te_5$ alloy powders for use as a sputtering target by spark plasma sintering. The effect of various sintering parameters, such as pressure, temperature and time, on the density and hardness of the target has been investigated in detail. Structural characterization was performed by scanning electron microscopy and X-ray diffraction. Hardness and thermal properties were measured by differential scanning calorimetry and micro-vickers hardness tester. The density and hardness of the sintered $Ge_2Sb_2Te_5$ materials were 5.8976~6.3687 $g/cm^3$ and 32~75 Hv, respectively.
김원태,방창욱 청주대학교 산업과학연구소 2012 産業科學硏究 Vol.30 No.1
In-situ composites consisted of ductile crystalline β phase embedded in a metallic glass matrix has been developed by suction casting (Ti44.3Zr27.7Ni3.7Cu8.3Be16)85Nb15. The composites show enhanced plasticity in both compressive and tensile deformation mode, even though some penalty of strength is inevitable. The composites showed large compressive fracture strain of about 23 % and uniform tensile elongation of about 2 % before necking took place. The enhancement of plasticity was discussed in terms of the development of stress concentrations around the β dendrite, causing localized yielding in glassy matrix and therefore promoting shear band nucleation, and blocking of shear band propagation by β phase.