- Preparation of Metal Injection Molded Dental Components using Spheroidized Ti Powders by Plasma Process
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Ji-Na Gwak, Sangsun Yang, Jung-Yeul Yun, Ju-Yong Kim, Seongjin Park, Hyun-Seung Kim, Yong-Jin Kim, Yong-Ho Park
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J Powder Mater. 2013;20(6):467-473.
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DOI: https://doi.org/10.4150/KPMI.2013.20.6.467
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- This research presents a preparation method of dental components by metal injection molding process (MIM process) using titanium scrap. About 20µm sized spherical titanium powders for MIM process were successfully prepared by a novel dehydrogenation and spheroidization method using in-situ radio frequency thermal plasma treatment. The effects of MIM process parameters on the mechanical and biological properties of dental components were investigated and the optimum condition was obtained. After sintering at 1250°C for 1 hour in vacuum, the hardness and the tensile strength of MIMed titanium components were 289 Hv and 584 MPa, respectively. Prepared titanium dental components were not cytotoxic and they showed a good cell proliferation property.
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Citations
Citations to this article as recorded by  - Effect of Heat Treatment Temperature and Atmosphere on the Microstructure of TiH2-WO3 Powder Mixtures
Han-Eol Lee, Yeon Su Kim, Sung-Tag Oh
Journal of Korean Powder Metallurgy Institute.2017; 24(1): 41. CrossRef - Characterization Of The Graded Microstructure In Powder Sintered Porous Titanium
J.-J. Oak, J.I. Bang, K.-C. Bae, Y.H. Kim, Y.-C. Lee, H.H. Chun, Y.H. Park
Archives of Metallurgy and Materials.2015; 60(2): 1265. CrossRef
- Influence of Particle Size Distribution on Green and Sintered Properties of Fe-Cr-Mo Prealloy Powder
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Ki-Bong Kim, Sangsun Yang, Yong-Jin Kim, Yong-Ho Park
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J Powder Mater. 2013;20(1):7-12.
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DOI: https://doi.org/10.4150/KPMI.2013.20.1.007
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- The effect of particle size distribution on green and sintered properties of Fe-Cr-Mo prealloy powder was investigated in this study. For the study, prealloyed Fe-Cr-Mo powders with different particle sizes were mixed as various ratios and cold compacted at various pressure and sintered at 1250°C for 30 min, 90%N_2+10%H_2 atmosphere in the continuous sintering furnace. The results shows that the powders with large particle size distribution have high compressibility and low ejection force. However the green strength are much less than those with small particle size distribution. Tensile prperties of the sintered specimes with large particles size also have high strength and elongation.
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Citations
Citations to this article as recorded by - The Effects of MoS2Addition on the Mechanical Properties of Fe-Cr-Mn-C-V P/M Alloy
Geon-Hong Kim, Hyun Seok Yang, Man-Sik Kong
Journal of Korean Powder Metallurgy Institute.2014; 21(4): 294. CrossRef - Investigation on the Sintering Behavior and Mechanical Properties of Al-Zn-Mg Alloy Powders Mixed with Al-Si-SiC Composite Powders
Gwang-Joo Jang, Kyung Tae Kim, Sangsun Yang, Yong-Jin Kim, Yong-Ho Park
Journal of Korean Powder Metallurgy Institute.2014; 21(6): 460. CrossRef
- Synthesis of Al/AlN Composites by Mechanical Alloying and the Effect of PCA on Their Properties
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Seok-Hyeoun Kim, Yong-Jin Kim, Jung-Ho Ahn
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J Korean Powder Metall Inst. 2011;18(3):238-243.
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DOI: https://doi.org/10.4150/KPMI.2011.18.3.238
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- Al/AlN composites were synthesized by mechanical alloying using process control agents(PCAs). Three different PCAs which contain N element, were examined to see the effectiveness of ball-milling and the nitridation during sintering. Among examined PCAs, C_8H_6N_4O_5 was the most effective to facilitate ball-milling and to form nitrides during a subsequent sintering. By a proper control of ball-milling and sintering, we could obtained surface-hardened Al-based composites.
- Synthesis of Yttrium Oxide Nanowire by Hydrothermal Method
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Kyung-Ki Kim, Yong-Jin Kim, Jung-Ho Ahn
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J Korean Powder Metall Inst. 2011;18(1):73-77.
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DOI: https://doi.org/10.4150/KPMI.2011.18.1.073
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15
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- Y(OH)_3 nanowires were synthesized by a hydrothermal reaction of metallic Y with aqueous solution of LiOH. The morphology and the size of the nanowires changed with varying the volume of the LiOH solution inside the autoclave. Y(OH)_3 nanowires transformed to Y_2O_3 by a subsequent heat-treatment without morphological change. By a proper control of hydrothermal reaction parameter and heat-treatment, the yield of pure Y_2O_3 nanowires up to 97% was attained.
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Citations
Citations to this article as recorded by - Synthesis and Characterization of SnO2-CoO/carbon-coated CoO Core/shell Nanowire Composites
Yu-Jin Lee, Bon-Ryul Koo, Hyo-Jin Ahn
Journal of Korean Powder Metallurgy Institute.2014; 21(5): 360. CrossRef
- Preparation of Ultrafine C/N Controled TiCxNy Powders by Magnesium Reduction
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Dong-Won Lee, Byoung-Kee Kim, Jung-Yeul Yun, Ji-Hoon Yu, Yong-Jin Kim
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J Korean Powder Metall Inst. 2010;17(2):142-147.
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DOI: https://doi.org/10.4150/KPMI.2010.17.2.142
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- The ultrafine titanium carbonitride (TiC_xN_y) particles below 100 nm in mean size, including various carbon and nitrogen contents (x=0.55~0.9, y=0.1~0.5), were successfully synthesized by new Mg-thermal reduction process. Nanostructured sub-stoichiometric titanium carbide (TiC_x) particles were initially produced by the magnesium reduction of gaseous TiCl_4+x/2C_2Cl_4 at 890°C and post heat treatments in vacuum were performed for 2 hrs to remove residual magnesium and magnesium chloride mixed with TiC_x. Finally, well C/N-controled TiC_xN_y phases were successfully produced by nitrification heat treatment under normal N_2 gas atmosphere at 1150°C for 2 hrs. The values of purity, mean particle size and oxygen content of produced particles were about 99.3%, 100 nm and 0.2 wt.%, respectively.
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Citations
Citations to this article as recorded by - Characteristics of Stainless Steel Composites with Nano-sized TiCxNy
Tae-Ho Ban, Sung-Bum Park, Soo-Jeong Jo, Dong-Won Lee, Farkhod R. Turaev, Yong-Il Park, Sung-Jin Kim
Journal of Korean Powder Metallurgy Institute.2011; 18(3): 290. CrossRef
- Preparation of Ultrafine TiCN Powders by Mg-reduction of Metallic Chlorides
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Dong-Won Lee, Jin-Chun Kim, Yong-Jin Kim, Byoung-Kee Kim
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J Korean Powder Metall Inst. 2009;16(2):98-103.
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DOI: https://doi.org/10.4150/KPMI.2009.16.2.098
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- The ultrafine titanium carbonitride particles (TiC_0.7N_0.3) below 100nm in mean size were successfully synthesized by Mg-thermal reduction process. The nanostructured sub-stoichiometric titanium carbide (TiC_0.7) particles were produced by the magnesium reduction at 1123K of gaseous TiC_l4+xC_2Cl_4 and the heat treatments in vacuum were performed for five hours to remove residual magnesium and magnesium chloride mixed with TiC_0.7. And final TiC_0.7N_0.3 phase was obtained by nitrification under normal N_2 gas at 1373K for 2 hrs. The purity of produced TiC_0.7N_0.3 particles was above 99.3% and the oxygen contents below 0.2 wt%. We investigated in particular the effects of the temperatures in vacuum treatment on the particle refinement of final product.
- Effects of Sintering Temperature and Atmosphere on Densification of Hypereutectic Al-Si Alloy Powders
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Jae-Wook Lee, Sang-Bin Park, Sang-Sun Yang, Yong-Jin Kim
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J Korean Powder Metall Inst. 2008;15(3):196-203.
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DOI: https://doi.org/10.4150/KPMI.2008.15.3.196
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- The densification behavior of Al-20Si-5.5Fe-1.2Mg-0.5Mn powders was investigated through micro-structure analysis of sintered specimens. The specimens sintered in vacuum or in high purity (99.999%) nitrogen showed porous near-surface microstructures. The densification of near-surface part was enhanced by means of ultra-high purity (99.9999%) nitrogen atmosphere. The relationship between slow densification and oxide surfaces of Al alloy powders was discussed. And the effects of Mg addition, nitrogen gas, and humidity on densification were discussed. In addition, the rapid growth of primary Si crystals above the critical temperature was reported.
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Citations
Citations to this article as recorded by - Effect Of Different Mechanical Milling Processes On Morphology And Microstructural Changes Of Nano And Micron Al-Powders
H.-S. Kim, B. Madavali, T.-J. Eom, C.-M. Kim, J.-M. Koo, T.-H. Lee, S.-J. Hong
Archives of Metallurgy and Materials.2015; 60(2): 1235. CrossRef
- Fabrication and Properties of High Strength Hypereutectic AI-Si Powders by a Gas Atomization Process II. Extrusion and Mechanical Properties
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Yong-Jin Kim, Jin-Chun Kim
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J Korean Powder Metall Inst. 2008;15(2):142-147.
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DOI: https://doi.org/10.4150/KPMI.2008.15.2.142
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- The hypereutectic Al-20 wt%Si powders including some amount of Cu, Fe, Mg, Mn were prepared by a gas atomization process. In order to get highly densified Al-Si bulk specimens, the as-atomized and sieved powders were extruded at 500°C, Microstructure and tensile properties of the extruded Al-Si alloys were investigated in this study. Relative density of the extruded samples was over 98%. Ultimate tensile strength (UTS) in stress-strain curves of the extruded powders increased after T6 heat treatments. Elongation of the samples was also increased from 1.4% to 3.2%. The fracture surfaces of the tested pieces showed a fine microstructure and the average grain size was about 1µm.
- 화염법을 이용한 나노입자의 제조 동향 및 전망
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Sang-Seon Yang, Jae-Uk Lee, Yong-Jin Kim
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J Korean Powder Metall Inst. 2007;14(6):415-421.
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DOI: https://doi.org/10.4150/KPMI.2007.14.6.415
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- Effect of Heat Treatment on the Microstructure and Mechanical Properties for Al-Si Alloyed Powder Material by Gas Atomizing and Hot Extrusion Process
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Ki-Young Nam, Hyeong-Ho Jin, Yong-Jin Kim, Seog-Young Yoon, Yong-Ho Park
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J Korean Powder Metall Inst. 2006;13(6):421-426.
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DOI: https://doi.org/10.4150/KPMI.2006.13.6.421
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- The microstructural and mechanical properties of Al-Si alloyed powder, prepared by gas atomization fallowed by hot extrusion, were studied by optical and scanning electron microscopies, hardness and wear testing. The gas atomized Al-Si alloy powder exhibited uniformly dispersed Si particles with particle size ranging from 5 to 8µm. The hot extruded Al-Si alloy shows the average Si particle size of less than 1µm. After heat-treatment, the average particle size was increased from 2 to 5µm. Also, mechanical properties of extruded Al-Si alloy powder were analyzed before and after heat-treatment. As expected from the microstructural analysis, the heat-treated samples resulted in a decrease in the hardness and wear resistance due to Si particle growth. The friction coefficient of heat-treated Al-Si alloyed powder showed higher value tough all sliding speed. This behavior would be due to abrasive wear mechanism. As sliding speed increases, friction coefficient and depth and width of wear track increase. No significant changes occurred in the wear track shape with increased sliding speed.
- Synthesis of Carbon Nanotubes by Chemical Method at Warm Temperatures
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Jung-Ho Ahn, Sang-Hyun Lee, Yong-Jin Kim, Byung-Sik Chung
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J Korean Powder Metall Inst. 2006;13(5):305-312.
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DOI: https://doi.org/10.4150/KPMI.2006.13.5.305
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- Amorphous carbon nanotubes were synthesized by a reaction of benzene, ferrocene and Na mixture in a small autoclave at temperatures as low as 400°C. The resulting carbon nanotubes were short and straight, but their inner hole was filled with residual products. The addition of quartz to the reacting mixture considerably promoted the formation of carbon nanotubes. A careful examination of powder structure suggested that the nanotubes in this process were mainly formed by surface diffusion of carbon atoms at the surface of solid catalytic particles, not by VLS(vapor-liquid-solid) mechanism.
- Spark Plasma Sintering of the Ductile Cu-Gas-atomized Ni Bulk Metallic Glass Composite Powders
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Jin-Chun Kim, Yong-Jin Kim, Byoung-Kee Kim, Ji-Soon Kim
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J Korean Powder Metall Inst. 2006;13(5):351-359.
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DOI: https://doi.org/10.4150/KPMI.2006.13.5.351
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- Ni based(Ni_57Zr_20Ti_18Si_2Sn_3) bulk metallic glass(BMG) powders were produced by a gas atomization process, and ductile Cu powders were mixed using a spray drying process. The Ni-based amorphous powder and Cu mixed Ni composite powders were compacted by a spark plasma sintering (SPS) processes into cylindrical shape. The relative density varied with the used SPS mold materials such as graphite, hardened steel and WC-Co hard metal. The relative density increased from 87% to 98% when the sintering temperature increased up to 460°C in the WC-Co hard metal mold.
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