전기방전소결을 이용한 Ti-Ni-Zr 준 결정상의 상변화 연구와 Ti, W 다공체 제작 (Phase Transformation of Ti-Ni-Zr Icosahedral Phase and Fabrication of Porous Ti and W Compacts using Electro-Discharge Sintering)

서지정보

· 발행기관 : 한국분말재료학회
· 수록지 정보 : 한국분말재료학회지 / 18권 / 2호 / 149 ~ 158페이지
· 저자명 : 조재영, 송기안, 이민하, 이효수, 이원희, 김기범

초록

Electro-Discharge Sintering (EDS) employs a high-voltage/high-current-density pulse of electrical energy, discharged from a capacitor bank, to instantaneously consolidate powders. In the present study, a single pulse of 0.57-1.1 kJ/0.45 g-atomized spherical Ti_(52)Zr_(28)Ni_(20) powders in size range of 10~30 and 30~50 μm consisting of β-(Ti, Zr) and icosahedral phases were applied to examine the structural evolution of icosahedral phase during EDS. Structural investigation reveals that high electrical input energy facilitates complete decomposition of icosahedral phase into C14 laves and β-(Ti, Zr) phases. Moreover, critical input energy inducing decomposition of the icosahedral phase during EDS depends on the size of the powder. Porous Ti and W compacts have been fabricated by EDS using rectangular and spherical powders upon various input energy at a constant capacitance of 450 μF in order to verify influence of powder shape on microstructure of porous compacts. Besides, generated heat (ΔH) during EDS, which is measured by an oscilloscope, is closely correlated with powder size.

영어초록

Electro-Discharge Sintering (EDS) employs a high-voltage/high-current-density pulse of electrical energy, discharged from a capacitor bank, to instantaneously consolidate powders. In the present study, a single pulse of 0.57-1.1 kJ/0.45 g-atomized spherical Ti_(52)Zr_(28)Ni_(20) powders in size range of 10~30 and 30~50 μm consisting of β-(Ti, Zr) and icosahedral phases were applied to examine the structural evolution of icosahedral phase during EDS. Structural investigation reveals that high electrical input energy facilitates complete decomposition of icosahedral phase into C14 laves and β-(Ti, Zr) phases. Moreover, critical input energy inducing decomposition of the icosahedral phase during EDS depends on the size of the powder. Porous Ti and W compacts have been fabricated by EDS using rectangular and spherical powders upon various input energy at a constant capacitance of 450 μF in order to verify influence of powder shape on microstructure of porous compacts. Besides, generated heat (ΔH) during EDS, which is measured by an oscilloscope, is closely correlated with powder size.

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