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박진수,김경택,최한신,Park, Jinsu,Kim, Kyungteak,Choi, Hanshin 한국분말야금학회 2019 한국분말재료학회지 (KPMI) Vol.26 No.6
The transition from "More-of-Less" markets (economies of scale) to "Less-of-More" markets (economies of scope) is supported by advances of disruptive manufacturing and reconfigurable-supply-chain management technologies. With the prevalence of cyber-physical manufacturing systems, additive manufacturing technology is of great impact on industry, the economy, and society. Traditionally, backbone structures are built via bottom-up manufacturing with either pre-fabricated building blocks such as bricks or with layer-by-layer concrete casting such as climbing form-work casting. In both cases, the design selection is limited by form-work design and cost. Accordingly, the tool-less building of architecture with high design freedom is attractive. In the present study, we review the technological trends of additive manufacturing for construction-scale additive manufacturing in particular. The rapid tooling of patterns or molds and rapid manufacturing of construction parts or whole structures is extensively explored through uncertainties from technology. The future regulation still has drawbacks in the adoption of additive manufacturing in construction industries.
적층식 제조(Additive manufacturing) 기술동향
오지원,나현웅,최한신,Oh, Ji-Won,Na, Hyunwoong,Choi, Hanshin 한국분말야금학회 2017 한국분말재료학회지 (KPMI) Vol.24 No.6
A three-dimensional physical part can be fabricated from a three-dimensional digital model in a layer-wise manner via additive manufacturing (AM) technology, which is different from the conventional subtractive manufacturing technology. Numerous studies have been conducted to take advantage of the AM opportunities to penetrate bespoke custom product markets, functional engineering part markets, volatile low-volume markets, and spare part markets. Nevertheless, materials issues, machines issues, product issues, and qualification/certification issues still prevent the AM technology from being extensively adopted in industries. The present study briefly reviews the standard classification, technological structures, industrial applications, technological advances, and qualification/certification activities of the AM technology. The economics, productivity, quality, and reliability of the AM technology should be further improved to pass through the technology adoption lifecycle of innovation technology. The AM technology is continuously evolving through the introduction of PM materials, hybridization of AM and conventional manufacturing technologies, adoption of process diagnostics and control systems, and enhanced standardization of the whole lifecycle qualification and certification methodology.
대기 열플라즈마를 이용한 NiCr-Cr₂O₃-Ag-BaF₂/CaF₂ 코팅미세조직과 상조성에 대한 고찰
한창민,최한신,김길영,이창희,황순영 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.6
A blended NiCr-Cr₂O₃-Ag-CaF₂/BaF₂ feedstock was sprayed using an atmospheric plasma spraying. Physical and thermophysical properties of each constituent phase are quiet different and resulting interactions of each constituent with the plasma jet can be expected to be different. Thus, an attempt to change the plasma jet characteristics by changing the hydrogen gas flow rate in view of the thermophysical properties of the plasma jet was tried. According to the hydrogen gas flow rate, phase compositions and microstructures were evaluated. The effects of phase composition and microstructure on the Vickers microhardness and bond strength were also evaluated. For empirically tracing the each constituent particle trajectory, spot spraying bead was produced. Finally, particle temperature and velocity according to the hydrogen gas flow rate was measured using alumina-titania particle instead of the blended feedstock. (Received January 19, 2004)
벌크 비정질 Ni_(57)Ti_(18)Zr_(20)Si₃Sn₂ 입자 산화거동에 따른 HVOF 코팅 상변화 거동
이상용,최한신,김길영,이창희,김용진 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.9
Bulk amorphous Ni_(57)Ti_(18) Zr_(20)Si₃Sn₂ feedstock was sprayed using a high velocity oxy-fuel spraying process. In order to evaluate the amorphous formability ign view of chemical instability, the oxygen to hydrogen gas flow rate ratio was changed at the constant total gas flow rate. Flame gas enthalpy was increased with the O₂/H₂ gas ratio. In-flight particle melting state was improved with the increase of oxidizer flow rate. Fthe amorphous phase fraction within an as-sprayed coating was decreased with the oxygen flow rate. From the thermal analysis and x-ray diffraction, the effects of 0₂/H₂ gas ratio on the crystallization of HVOF sprayed bulk amorphous Ni_(57)Ti_(18) Zr_(20)Si₃ could be divided into two categories. One is due to the solid-state crystallization during flight along the low gas enthalpy The other results from the of bulk amorphous feedstock due to the chemical composition change resulting from in-flight particle oxidation at the higher oxygen gas flow rate.