Journal of Powder Materials

[Korean]
Formation of Nano-oxides on Porous Metallic Glass Compacts using Hydrothermal Synthesis: H. J. Park, Y. S. Kim, S. H. Hong, J. T. Kim, J. Y. Cho, W. H. Lee, K. B. Kim; J Korean Powder Metall Inst. 2015;22(4):229-233. Published online August 1, 2015; DOI: https://doi.org/10.4150/KPMI.2015.22.4.229

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Porous metallic glass compact (PMGC) are developed by electro-discharge sintering (EDS) process of gas atomized Zr_41.2Ti_13.8Cu_12.5Ni₁₀Be_22.5 metallic glass powder under of 0.2 kJ generated by a 450 μF capacitor being charged to 0.94 kV. Functional iron-oxides are formed and growth on the surface of PMGCs via hydrothermal synthesis. It is carried out at 150°C for 48hr with distilled water of 100 mL containing Fe ions of 0.18 g/L. Consequently, two types of iron oxides with different morphology which are disc-shaped Fe₂O₃ and needle-shaped Fe₃O₄ are successfully formed on the surface of the PMGCs. This finding suggests that PMGC witih hydrothermal technique can be attractive for the practical technology as a new area of structural and functional materials. And they provide a promising road map for using the metallic glasses as a potential functional application.

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Enhanced wear resistivity of a Zr-based bulk metallic glass processed by high-pressure torsion under reciprocating dry conditions
Soo-Hyun Joo, Dong-Hai Pi, Jing Guo, Hidemi Kato, Sunghak Lee, Hyoung Seop Kim
Metals and Materials International.2016; 22(3): 383. CrossRef

[Korean]
Porous and Porous Surfaced Ti-6Al-4V Implants Fabricated by Electro-Discharge-Sintering : (2) Hardness and Compressive Strength: C. Y. Hyun, J. K. Huh, W. H. Lee; J Korean Powder Metall Inst. 2005;12(5):332-335.; DOI: https://doi.org/10.4150/KPMI.2005.12.5.332

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Abstract PDF: Porous and porous surfaced Ti-6Al-4V implant compacts were fabricated by electro-discharge-sintering (EDS) of atomized spherical Ti-6Al-4V powders with a diameter of 100-150;µm, The solid core formed in the center of the compact after discharge was composed of acicular alpha+beta Widmanstatten grains, The hardness value at the solid core was much higher than that at the particle interface or particles in the porous layer, which can be attributed to both heat treatment and work hardening effects induced from EDS, The compressive yield strength was in a range of 19 to 436 MPa which significantly depends on both input energy and capacitance, Selected porous-surfaced Ti-6Al-4V implant compacts with a solid core have much higher compressive strengths compared to the human teeth and sintered Ti dental implants.

[Korean]
Fully Porous and Porous Surfaced Ti-6Al-4V Implants Fabricated by Electro-Discharge-Sintering: (1) Fabrication Method and Fundamental Characteristics: C. Y. Hyun, J. K. Huh, W. H. Lee; J Korean Powder Metall Inst. 2005;12(5):325-331.; DOI: https://doi.org/10.4150/KPMI.2005.12.5.325

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Abstract PDF: Implant prototypes with various porosities were fabricated by electro-discharge-sintering of atomized spherical Ti-6Al-4V powders. Single pulse of 0.75 to 2.0 kJ/0.7 g-powder, using 150, 300, and 450µF capacitors was applied to produce a fully porous and porous surfaced implant compact. The solid core formed in the center of the compact after discharge was composed of acicular alpha+beta grains and porous layer consisted of particles connected in three dimensions by necks. The solid core and neck sizes increased with an increase in input energy and capacitance. On the other hand, pore volume decreased with increased capacitance and input energy due to the formation of solid core. Capacitance and input energy are the only controllable discharge parameters even though the heat generated during a discharge is the unique parameter that determines the porosity of compact. It is known that electro-discharge-sintering of spherical Ti-6Al-4V powders can efficiently produce fully-porous and porous surfaced Ti-6Al-4V implants with various porosities in a short time less then 400 isec by manipulating the discharging condition such as input energy and capacitance including powder size.

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