75 Result(s)

Article

Cooling rate effect on phase transformation of plasma sprayed partially stabilized zirconia

Jaeyun Moon, Hanshin Choi, Youngdo Kim… in Journal of Materials Science Letters (2001)

Article

Phase evolutions of plasma sprayed ceria and yttria stabilized zirconia thermal barrier coating

Hanshin Choi, Hyungjun Kim, Changhee Lee in Journal of Materials Science Letters (2002)

Article

Effect of dilution on the behavior of solidification cracking in PTAW overlay deposit on Ni-Base superalloys

In this study, the effects of dilution on the solidification cracking susceptibility of PTAW (Plasma Transferred Arc Welding) Inconel 625 and 718 overlay on Nimonic 80A were observed. In order to evaluate soli...

Yongsoo Ahn, Byunghyun Yoon, Hyungjun Kim… in Metals and Materials International (2002)

Article

Critical factors affecting the amorphous phase formation of NiTiZrSiSn bulk amorphous feedstock in vacuum plasma spray

Hanshin Choi, Juneseob Kim, Changhee Lee, Koo Hyun Lee in Journal of Materials Science (2005)

Article

Effect of in-flight particle oxidation on the phase evolution of HVOF NiTiZrSiSn bulk amorphous coating

Bulk amorphous NiTiZrSiSn feedstock was sprayed using a high velocity oxy-fuel spraying process. In order to evaluate the amorphous formability in view of chemical instability, the oxygen to hydrogen gas flow ...

Hanshin Choi, Sangyong Lee, Byoungmoon Kim, Hyoungho Jo… in Journal of Materials Science (2005)

Article

Dendritic Iridium(III)-Encapsulated Complexes for Organic Light Emitting Diodes

The syntxhesis, photo-physics, and electroluminescence of new types of Iridium(III)-encapsulated dendrimers are described. Thus, four different iridium complexes [Ir(III)(C^N)₂(LX), Blue-DCBP, Green-DCBP, Yellow-...

Ho-** Son, Won-Sik Han, Kyu-Bum Choi, Dae-Hyun Kim… in MRS Online Proceedings Library (2007)

Article

Coarsening Behavior of the (Ti, Nb)(C, N) Complex Particle in a Microalloyed Steel Weld Heat-Affected Zone Considering the Critical Particle Size

Our recent report revealed the effect of critical particle size on the particle coarsening behavior of the TiN particle. In the present work, the equation for critical particle size is extended by considering ...

Joonoh Moon, Sanghoon Kim, Jongbong Lee… in Metallurgical and Materials Transactions A (2007)

Article

Thin-Films of Poly-Triarylamines for Electro-Optic Applications

We observed that a new anionic triarylamine copolymer, which is easily accessable by radical polymerization can be used for the preparation of thin semiconducting organic films in two extremely different ways:...

Kyungsun Choi, Jeonghun Kwak, Changhee Lee, Hosub Kim, Kookheon Char… in Polymer Bulletin (2008)

Article

Effects of Silver Addition on Properties and Performance of Plasma Sprayed La_0.6Sr_0.4Co_0.2Fe_0.8O_3−δ Interconnect Layer

Interconnect layers on stainless steel substrates (STS430) for solid oxide fuel cells (SOFC) were built up by atmospheric plasma spraying (APS) using spray dried La_0.6Sr_0.4Co_0.2Fe_0.8O_3−δ (LSCF) and blended LSCF/A...

Soodong Park, S. Kumar, Hyuntaek Na, Changhee Lee in Journal of Thermal Spray Technology (2008)

Article

The Effects of Successive Impacts and Cold Welds on the Deposition Onset of Cold Spray Coatings

In this study, the impact and deposition behavior of nickel particles onto relatively soft 6061-T6 aluminum alloy and copper substrates in a kinetic spray process was investigated by comparing individual parti...

Yuming **ong, Gyuyeol Bae, **ang **ong, Changhee Lee in Journal of Thermal Spray Technology (2010)

Article

An Experimental and Finite Element Study of Cold Spray Copper Impact onto Two Aluminum Substrates

The effect of cold spray temperature and substrate hardness on particle deformation and adhesion has been studied, with particular emphasis on adiabatic shearing leading to melting. Copper particles were cold ...

Peter C. King, Gyuyeol Bae, Saden H. Zahiri… in Journal of Thermal Spray Technology (2010)

Article

Cracking behavior in a dissimilar weld between high silicon nodular cast iron and ferritic stainless steel

In this work, the microstructural evolution and cracking behavior of a dissimilar weld between high silicon nodular cast iron and ferritic stainless steel was investigated. An austenitic filler metal (Y309) wa...

Sanghoon Kim, Sangchul Lee, Kyutae Han, Seunggab Hong… in Metals and Materials International (2010)

Article

Effect of Thermally Softened Bronze Matrix on the Fracturing Behavior of Diamond Particles in Hybrid Sprayed Bronze/Diamond Composite

In our previous study (Na et al., Compos Sci Technol 69:463-468, 2009), optimized thickness of protective nickel film was proposed for smaller diamond feedstock to obtain reduced impact stress and uniform flig...

Hyuntaek Na, Gyuyeol Bae, Kicheol Kang, Hyungjun Kim… in Journal of Thermal Spray Technology (2010)

Article

Variation of microstructures and mechanical properties in the post-weld heat-treated HAZ of Cu containing HSLA steel welds

The present study focuses on the effect of Cu and post-weld heat treatment (PWHT) on the microstructure and mechanical properties in the coarse grained heat affected zone (CGHAZ) of Cu containing high strength...

Sanghoon Kim, Jongho Lee, Byoungchul Hwang… in Metals and Materials International (2011)

Article

Influence of the interface temperature and strain gradients on the impact energy model of a soft particle on a hard substrate during kinetic spraying

In this study, the individual particle impact behaviors of a soft particle on a hard substrate during a kinetic spraying operation were observed. The ratio of the bonds was compared to the difference between t...

Youlgwun Ji, Gyuyeol Bae, Kicheol Kang, Changhee Lee in Metals and Materials International (2011)

Article

Dependence of Bonding Mechanisms of Cold Sprayed Coatings on Strain-Rate-Induced Non-Equilibrium Phase Transformation

Strain-rate-induced amorphization at the impact interface of Ni-Cu was observed in a cold spray process by high-resolution transmission electron microscopy. Based on finite element analysis for the evolution o...

Yuming **ong, **ang **ong, Sanghoon Yoon… in Journal of Thermal Spray Technology (2011)

Article

Evaluation of Die-Soldering and Erosion Resistance of High Velocity Oxy-Fuel Sprayed MoB-Based Cermet Coatings

Soldering and erosion are two of the biggest serious problems faced in the die-casting industries. Cermet coatings utilized by high-velocity oxy-fuel (HVOF) spray technology have been developed in an attempt t...

Faisal Farooq Khan, Gyuyeol Bae, Kicheol Kang… in Journal of Thermal Spray Technology (2011)

Article

Liquation behavior in the weld HAZ of high Si nodular iron

In the present study, liquation behavior including the constitutional liquation phenomena in the weld heataffected zone (HAZ) of nodular cast iron with 4% Si was investigated. The thermal cycle of the weld HAZ...

Kyutae Han, Sanghoon Kim, Seunggab Hong, Changhee Lee in Metals and Materials International (2012)