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Hong Moon-Hee,Choi Jae-Ho,Lee Seong,Kim Eun-Pyo,Noh Joon-Woong,Lee Sung-Ho,Kim Young-Moo 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
An infiltration technique using W-Cu composite powder has been developed to enhance microstructural uniformity of W-Cu pseudo-alloy. W-Cu composite powder, manufactured by reduction from WO3 and CuO powder mixtures, were blended with W powder and then cold iso-statically pressed into a cylindrical bar under 150 MPa. The pressed samples were pre-sintered at 1300 oC for 1 hour under hydrogen to make a skeleton structure. This skeleton structure was more homogeneous than that formed by using W and Cu powder mixtures. The skeleton structures were infiltrated with Cu under hydrogen atmosphere. The infiltrated W-Cu pseudo-alloy showed homogeneous microstructure without Cu rich region.
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[ ] Prepared by Calciothermic Reduction-Diffusion Using Different Iron Powders
Boareto J.C.,Soyama J.,Felisberto M.D.V.,Hesse R.,Pinto A.V.A.,Taylor T.R.,Wendhausen P.A.P. 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
This paper compares the effect of using different types of iron powders for the preparation of by calciothermic reduction-diffusion (CRD). Three types of iron powder were used: carbonyl, sponge and water atomized. The results show that, when immediately nitrogenated after the CRD process, prepared from sponge and water atomized iron powders yield -magnets with a high degree of texture. However, after a suitable treatment with hydrogen followed by nitrogenation, -powders made from Carbonyl iron produce magnets with the best quality regarding coercivity, remanence and degree of texture.
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Glass Infilteration in Bonding of and Layers
Shin Hyo-Soon,Wang Jong-Hoe,Kim Jong-Hee 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
A novel sintering process is proposed for bonding of and layers. Common commercial glass was used and infilterated among filler particles. As the kind of commercial glass, the phenomenon of the infilteration is different. Although Sud-1140 glass forms a glass/filler composite, it is not completely infilterated into the filler particles at . However as the increase of sintering temperature the infilteration of glass was improved. In this study, GA-1 and GA-12 glasses were infilterated the more than Sud-1140 glass. However, they are reacted by layer. The results of the experiment show that constrained sintering and the co-firing of the different materials were possible for glass infilteration using Sud-1140 glass at .
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Masuda Satoshi,Takagi Kenta,Dong Wei,Kawasaki Akira 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Monosized germanium micro particles are prepared by a newly developed Pulsated Orifice Ejection Method. The obtained particles are categorized into two kinds of the microstructures as refined and coarse ones. The morphological difference is estimated to be determined by the undercooling level during nucleation. Actually, the increase in the temperature of the melt was effective in coarsening the microstructure, because the temperature of the melt intensely relates to the undercooling level. The transition temperature of coarse and refined microstructures is found to be 1300-1350K. Furthermore, a triggered nucleation could improve the crystallinity of the particles in the short separation.
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A Technical History of Powder Forging - Lessons Learned for Technology Transition
Kuhn Howard A. 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Powder forging has progressed in three decades through the stages of incubation, growth, and maturity, now accounting for 8% of the 5 B global PM market. In this presentation, a history of the technical development of powder forging will be recounted, from early failed attempts and misconceptions, through seminal academic and industrial research, to technical and commercial success. Discussion covers the contributions of government and industrial funding, fundamental knowledge development, and industrial champions for successful implementation. The focus is on lessons learned that may be beneficial to the transition of other technologies for the powder metallurgy industry.
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Seungyeon Lee,Kyung Tae Kim,Ji-Hun Yu,Hyoung Seop Kim,Jae Wung Bae,Jeong Min Park 한국분말재료학회(구 한국분말야금학회) 2024 한국분말재료학회지 (KPMI) Vol.31 No.1
The emergence of ferrous-medium entropy alloys (FeMEAs) with excellent tensile properties represents a potential direction for designing alloys based on metastable engineering. In this study, an FeMEA is successfully fabricated using laser powder bed fusion (LPBF), a metal additive manufacturing technology. Tensile tests are conducted on the LPBF-processed FeMEA at room temperature and cryogenic temperatures (77 K). At 77 K, the LPBF-processed FeMEA exhibits high yield strength and excellent ultimate tensile strength through active deformation-induced martensitic transformation. Furthermore, due to the low stability of the face-centered cubic (FCC) phase of the LPBFprocessed FeMEA based on nano-scale solute heterogeneity, stress-induced martensitic transformation occurs, accompanied by the appearance of a yield point phenomenon during cryogenic tensile deformation. This study elucidates the origin of the yield point phenomenon and deformation behavior of the FeMEA at 77 K.
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Particle Deposition, PD Process - New Potential in Material Processing
Fukumoto Masahiro 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1
Oridinal thermal spray process has developed into two ways, namely, temperature dominated represented by plasma spraying, and velocity dominated represented by HVOF. It is common for both that the particle materials sprayed are basically in melted or half melted condition. New process has developed recently, that is, Cold Spray and Aerosol Deposition. Particle's heating is limited in CS lower than half of the material's melting point. Moreover, exactly no heating is loaded in AD process. Through the investigation on common feature for these three spraying processes, potential of new material process - Particle Deposition, PD - is considered and proposed
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