12 Result(s)

Article

Spark plasma sintering and decomposition of the Y₃NbO₇:Eu phase

The spark plasma sintering (SPS) of Eu³⁺-doped Y₃NbO₇ niobate phase was investigated to obtain dense ceramics. Although SPS allowed obtaining high-density ceramics, decomposition of the niobate phase occurred at ...

K. Y. Kim, A. Veillere, U-C. Chung, V. Jubera, J.-M. Heintz in Journal of Materials Science (2018)

Article

VUV photoluminescence of La_1−xGd_xPO₄:Tb³⁺ green phosphors synthesized by ultrasonic spray pyrolysis

(La_1−xGd_x)_0.94PO₄:Tb_0.06 (0 ≤ x ≤ 1.0) green phosphors were synthesized by an ultrasonic spray pyrolysis process. The annealed (La_1−xGd_x)_0.94PO₄:Tb_0.06 phosphors exhibited the formation of a single-phase oxide wi...

K. Park, K. Y. Kim in Metals and Materials International (2011)

Article

An Al+Y Coating Process for Improvement of the High-Temperature Oxidation Resistance of a TiAl Alloy

An Al+Y codeposition by a single EB–PVD process has been developed to improve the high-temperature oxidation resistance of a TiAl alloy. The Al+Y codeposited TiAl alloy with various ratios of Al and Y evaporat...

H. G. Jung, D. M. Wee, M. H. Oh, K. Y. Kim in Oxidation of Metals (2001)

Article

Crystal Structure of A2+ (Mg1/3Nb2/3)O3, (A2+ = Sr2+ and Ca2+) Ceramics

C.-S. Park, J. H. Paik, S. Nahm, H.-J. Lee… in Journal of Materials Science Letters (1999)

Chapter

Characterization of Fiber-Waviness in Composite Specimens using Deep Line-Focus Acoustic Microscopy

A line-focus transducer used as the transduction element in an acoustic microscope forms the basis of a powerful materials characterization tool. When such a transducer is excited with rf-burst signals the tra...

W. Sachse, K. Y. Kim, D. **ang, N. N. Hsu in Nondestructive Characterization of Materia… (1998)

Article

Leakage Current Behaviors of Ba_0.5Sr_0.5TiO₃ Thin Films on Pt, RuO₂, and Pt/RuO₂ Bottom Electrodes

Ba_0.5Sr_0.5TiO₃ thin films were grown by rf-magnetron sputtering. Pt and RuO₂ films were used as bottom electrodes of the Ba_0.5Sr_0.5TiO₃ thin films. Further, a Pt/RuO₂ hybrid electrode was adopted as an electrode ...

W. Jo, D. C. Kim, H. M. Lee, K. Y. Kim in MRS Online Proceedings Library (1996)

Article

Improvement of cyclic high-temperature corrosion resistance of pack-aluminized heat-resistant stainless steels

Modification of pack aluminizing for heat-resistant stainless steels was studied to improve corrosion resistance by controlling the microstructure of the coating layer. The major process parameters examined in...

K. Y. Kim, H. G. Jung, B. G. Seong, S. Y. Hwang in Oxidation of Metals (1994)

Article

Effect of addition of the CuO-Fe₂O₃ system on the electromagnetic wave absorbing properties of sintered ferrite

The effects of the addition of the CuO-Fe₂O₃ system as a liquid former on the microstructure and electromagnetic wave absorbing property of sintered Ni-Zn ferrite were investigated. The CuO-Fe₂O₃ system, a spinel...

K. Y. Kim, W. S. Kim, Y. D. Ju, H. J. Jung in Journal of Materials Science (1992)

Article

Preparation and Microstructural Characterization of Ferroelectric Thin Film PbTiO₃ on Si, MgO, and Sapphire Deposited by DC Reactive Multitarget Co-Sputtering.

PbTiO₃ thin films on Si (100) plane were prepared by the DC reactive multitarget cosputtering technique. The film composition and structure were examined as a function of deposition parameters. The crystal struct...

K.Y. Kim, H.I. Hwang, J.Y. Lee, W.K. Choo in MRS Online Proceedings Library (1991)

Chapter

Determination of Elastic Constants of Anisotropic Solids from Group Velocity Data

Most determinations of elastic constants of anisotropic solids are based on acoustic wave phase velocity measurements [1,2]. The methods for recovering elastic constants from phase velocity data are fairly str...

A. G. Every, Wolfgang Sachse, K. Y. Kim… in Review of Progress in Quantitative Nondest… (1991)

Article

The direct bonding between copper and MgO-doped Si₃N₄

An application of direct bonding method for copper to silicon nitride (Si₃N₄) joining was investigated. Si₃N₄ was sintered with 5wt% MgO at 1700 ° C for 30 min in nitrogen atmosphere, and oxidized at various temp...

S. T. Kim, C. H. Kim, J. Y. Park, Y. B. Son, K. Y. Kim in Journal of Materials Science (1990)

Chapter

Rate Controlled Sintering of Explosively Shock-Conditioned Alumina Powders

Fine, high purity alumina powders subjected to nominal plane strain shock conditioning in precompacted disc form by an explosively driven flyer plate were reconstituted as well-compacted specimens (D_O = 0.65) and...

K. Y. Kim, A. D. Batchelor, K. L. More… in Emergent Process Methods for High-Technolo… (1984)