- A Study of Electro-Discharge-Sintering of Ti-6Al-4V Spherical Powders Doped with Hydroxyapatite by Spex Milling and Its Consolidation Characteristics
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Y.J. Cho, Y.H. Kim, Y.H. Jo, M.J. Kim, H.S. Kim, S.W. Kim, J.H. Park, W.H. Lee
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J Powder Mater. 2013;20(5):376-381.
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DOI: https://doi.org/10.4150/KPMI.2013.20.5.376
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- Spherical Ti-6Al-4V powders in the size range of 250 and 300 µm were uniformly doped with nano-sized hydroxyapatite (HAp) powders by Spex milling process. A single pulse of 0.75-2.0 kJ/0.7 g of the Ti-6Al-4V powders doped with HAp from 300 mF capacitor was applied to produce fully porous and porous-surfaced Ti-6Al-4V implant compact by electro-discharge-sintering (EDS). The solid core was automatically formed in the center of the compact after discharge and porous layer consisted of particles connected in three dimensions by necks. The solid core increased with an increase in input energy. The compressive yield strength was in a range of 41 to 215 MPa and significantly depended on input energy. X-ray photoelectron spectroscopy and energy dispersive x-ray spectrometer were used to investigate the surface characteristics of the Ti-6Al-4V compact. Ti and O were the main constituents, with smaller amount of Ca and P. It was thus concluded that the porous-surfaced Ti-6Al-4V implant compacts doped with HAp can be efficiently produced by manipulating the milling and electro-discharge-sintering processes.
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Citations
Citations to this article as recorded by  - Effect of heat treatment on the microstructural and mechanical properties of Ti6Al4V-equine bone nanocomposites
Wonki Jeong, Se-Eun Shin, Hansol Son, Hyunjoo Choi
Materials Characterization.2021; 179: 111361. CrossRef
- Phase Transformation of Ti-Ni-Zr Icosahedral Phase and Fabrication of Porous Ti and W Compacts using Electro-Discharge Sintering
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J.Y. Cho, G.A. Song, M.H. Lee, H.S. Lee, W.H. Lee, K.B. Kim
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J Korean Powder Metall Inst. 2011;18(2):149-158.
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DOI: https://doi.org/10.4150/KPMI.2011.18.2.149
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Abstract
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- 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_52Zr_28Ni_20 powders in size range of 10~30 and 30sim50µm consisting of beta-(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 beta-(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 450µF in order to verify influence of powder shape on microstructure of porous compacts. Besides, generated heat (DeltaH) during EDS, which is measured by an oscilloscope, is closely correlated with powder size.
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