- Characteristics of Pt/C Nano-catalyst Synthesized by Arc Plasma Deposition
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Hye-Sook Joo, Han-Shin Choi, Heon-Phil Ha, Do-Hyang Kim
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J Korean Powder Metall Inst. 2012;19(1):6-12.
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DOI: https://doi.org/10.4150/KPMI.2012.19.1.006
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- Electricity is generated by the combined reactions of hydrogen oxidation and oxygen reduction which occur on the Pt/C catalyst surface. There have been lots of researches to make high performance catalysts which can reduce Pt utilization. However, most of catalysts are synthesized by wet-processes and a significant amount of chemicals are emitted during Pt/C synthesis. In this study, Pt/C catalyst was produced by arc plasma deposition process in which Pt nano-particles are directly deposited on carbon black surfaces. During the process, islands of Pt nano-particles were produced and they were very fine and well-distributed on carbon black surface. Compared with a commercialized Pt/C catalyst (Johnson & Matthey), finer particle size, narrower size distribution, and uniform distribution of APD Pt/C resulted in higher electrochemical active surface area even at the less Pt content.
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Citations
Citations to this article as recorded by  - Luminescence Properties of InP/ZnS Quantum Dots depending on InP Core synthesis Temperature
Han Wook Seo, Da-Woon Jeong, Min Young Kim, Seoung Kyun Hyun, Ji Sun On, Bum Sung Kim
Journal of Korean Powder Metallurgy Institute.2017; 24(4): 321. CrossRef
- Fabrication and Tensile Properties of Alloy 617 base ODS Alloy
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Hyoung-Kee Min, Suk-Hoon Kang, Tae-Kyu Kim, Chang-Hee Han, Do-Hyang Kim, Jin-Sung Jang
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J Korean Powder Metall Inst. 2011;18(6):482-487.
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DOI: https://doi.org/10.4150/KPMI.2011.18.6.482
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- Alloy 617, Ni-22Cr-12Co-9Mo base oxide dispersion strengthened alloy was fabricated by using mechanical alloying, hot isostatic pressing and hot rolling. Uniaxial tensile tests were performed at room temperature and at 700°C. Compared with the conventional Alloy 617, ODS alloy showed much higher yield strength and tensile strength, but lower elongation. Fracture surfaces of the tensile tested specimens were investigated in order to find out the mechanism of fracture mode at each test temperature. Grain adjustment during tensile deformation was analyzed by electron backscattered diffraction mapping, inverse pole figures and TEM observation.
- Microstructural Evaluation and High Temperature Mechanical Properties of Ni-22Cr-18Fe-9Mo ODS Alloy
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Seok-Hoan Jeong, Suk-Hoon Kang, Chang-Hee Han, Tae-Kyu Kim, Do-Hyang Kim, Jin-Sung Jang
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J Korean Powder Metall Inst. 2011;18(5):456-462.
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DOI: https://doi.org/10.4150/KPMI.2011.18.5.456
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- Yttrium oxide is one of the most thermo-dynamically stable materials, so that it is generally used as a dispersoid in many kinds of dispersion strengthed alloys. In this study, a nickel-base superalloy is strengthened by dispersion of yttrium oxide particles. Elemental powders with the composition of Ni-22Cr-18Fe-9Mo were mechanically alloyed(M.A.) with 0.6 wt% Y_2O_3. The MA powders were then HIP(hot isotactic press)ed and hot rolled. Most oxide particles in Ni-22Cr-18Fe-9Mo base ODS alloy were found to be Y-Ti-O type. The oxide particles were uniformly dispersed in the matrix and also on the grain boundaries. Tensile test results show that the yield strength and ultimate tensile strength of ODS alloy specimens were 1.2~1.7 times higher than those of the conventional HastelloyTM X(R), which has the same chemical compositions with ODS alloy specimens except the oxide particles.
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Citations
Citations to this article as recorded by - Effect of Y2O3 dispersoids on microstructure and creep properties of Hastelloy X processed by laser powder-bed fusion
Jovid U. Rakhmonov, Christoph Kenel, Anthony De Luca, Christian Leinenbach, David C. Dunand
Additive Manufacturing Letters.2022; 3: 100069. CrossRef - Evaluation of Creep Reliability of Powder Metallurgy and Cast-type Ni-based Superalloy by Using Ultrasonic Wave
Chan-Yang Choi, Jin-Hun Song, Se-Ung Oh, Chung-Seok Kim, Sook-In Kwun, Sung-Tag Oh, Chang-Yong Hyun, Jai-Won Byeon
Journal of Korean Powder Metallurgy Institute.2012; 19(3): 215. CrossRef
- Thermoelectric Properties of Rapid Solidified p-type Bi2Te3 Alloy Fabricated by Spark Plasma Sintering(SPS) Process
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Chul-Dong Moon, Soon-Jik Hong, Do-Hyang Kim, Taek-Soo Kim
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J Korean Powder Metall Inst. 2010;17(6):494-498.
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DOI: https://doi.org/10.4150/KPMI.2010.17.6.494
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- The p-type thermoelectric compounds of Bi_2Te_3 based doped with 3wt% Te were fabricated by a combination of rapid solidification and spark plasma sintering (SPS) process. The effect of holding time during spark plasma sintering (SPS) on the microstructure and thermoelectric properties were investigated using scanning electron microscope (SEM), X-ray diffraction (XRD) and thermoelectric properties. The powders as solidified consisted of homogeneous thermoelectric phases. The thermoelectric figure of merit measured to be maximum (3.41times10-3/K) at the SPS temperature of 430°C.
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Citations
Citations to this article as recorded by - Effect of Sintering Temperature on the Thermoelectric Properties of Bismuth Antimony Telluride Prepared by Spark Plasma Sintering
경석 이, 영근 정, 성호 서, 상현 진, 봉영 유
Korean Journal of Materials Research.2012; 22(6): 280~284. CrossRef
- Powder Metallurgy Process in Bulk Amorphous Alloys
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Hwi-Jun Kim, Jung-Chan Bae, Do-Hyang Kim
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J Korean Powder Metall Inst. 2006;13(6):387-395.
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DOI: https://doi.org/10.4150/KPMI.2006.13.6.387
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