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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean institute of surface engineering
Journal Basic Information
Journal DOI :
The Korean Institute of Surface Engineering
Editor in Chief :
Volume & Issues
Volume 35, Issue 6 - Dec 2002
Volume 35, Issue 5 - Oct 2002
Volume 35, Issue 4 - Aug 2002
Volume 35, Issue 3 - Jun 2002
Volume 35, Issue 2 - Apr 2002
Volume 35, Issue 1 - Feb 2002
Selecting the target year
A Study on Improvement of Surface Qualify in Injection Molded Parts
Journal of the Korean institute of surface engineering, volume 35, issue 3, 2002, Pages 113~120
Injection molded plastic parts have many surface defects. These include a weld line, sink mark, flow mark, gloss, shading, scratching etc. Because these surface faults are not aesthetically acceptable, plastic parts are produced through painting or texturing. The purpose of this paper is to develop paintless molded parts using a flow control method. Computer aided injection mold filling simulations were used in order to minimize the number of defects from injection molding. Based on the numerical results, FR(Flame Retardant) HIPS was developed and the guidelines for part design, mold design, and the processing conditions were established. The effects of cost savings, improvements in productivity, and recycling were considered by reducing the number of surface faults and eliminating the painting process.
A study on the synthesis and mechanical properties of WC/C multilayered films
Journal of the Korean institute of surface engineering, volume 35, issue 3, 2002, Pages 121~126
WC/C multilayered films were deposited by arc ion plating and magnetron sputter hybrid system with various
flow rates and bias voltages. The coatings have been characterized with respect to their chemical composition (Glow Discharge Optical Emission Spectroscopy), hardness(Knoop micro-hardness), residual stress(Laser beam bending) and friction coefficient(Ball on disc type wear test). Deposition rate, microhardness and residual stress of WC/C films were observed to increase with increasing the
flow rates. The highest hardness and residual stress were measured to be 26.5 GPa and 1.1GPa for, WC/C film deposited at substrate bias of -100V. WC/C multilayered film was obtained very low friction coefficient(~0.1).
High speed performance of Pb(Zr,Ti)O
capacitors through lattice engineering
Yang, B.L. ;
Journal of the Korean institute of surface engineering, volume 35, issue 3, 2002, Pages 127~132
High speed performance of ferroelectric Pb(Zr,Ti)
(PZT) based capacitors is reported. La substitution up to 10% was performed to systematically lower the coercive and saturation voltages of epitaxial ferroelectric capacitors grown on Si using a (
)N/Pt conducting barrier composite. Ferroelectric capacitors substituted with 10% La show significantly lower coercive voltage compared to capacitors with 0% and 3% La. This is attributed to a systematic decrease in the tetragonality (i.e., c/a ratio) of the ferroelectric phase. Furthermore, the samples doped with 10% La showed dramatically better retention and pulse width dependent polarization compared to the capacitors with 0% and 3% La. These capacitors show promise as storage elements in low power high density memory architectures.
Synthesis and Mechanical Properties of nc-TiN/a-Si
Nanocomposite Coating Layer
Journal of the Korean institute of surface engineering, volume 35, issue 3, 2002, Pages 133~140
The Ti-Si-N coating layers were synthesized on SKD 11 steel substrate by a DC reactive magnetron co-sputtering technique with separate Ti and Si targets. The high resolution transmission electron microscopy (HRTEM) and X-ray photoelectron spectroscopy (XPS) analyses for the coating layers revealed that microstructure of Ti-Si-N layer was nanocomposite, consisting of nano-sized TiN crystallites surrounded by amorphous
phase. The highest hardness value of about 39 GPa was obtained at the Si content of ~11at.%, where the microstructure had fine TiN crystallites (about 5nm in size) dispersed uniformly in amorphous matrix. As the Si content in Ti-Si-N films increased, the TiN crystallites became from aligned to randomly oriented microstructure, finer, and fully penetrated by amorphous phase. Free Si appeared in the layers due to the deficit of nitrogen source at higher Si content. Friction coefficient and wear rate of the Ti-Si-N coating layer significantly decreased with increase of relative humidity. The self-lubricating tribe-layers such as
seemed to play an important role in the wear behavior of Ti-Si-N film against steel.
Effect of Pulse Plating on the Hardness and Ductility of Electroplated Fe-C
Journal of the Korean institute of surface engineering, volume 35, issue 3, 2002, Pages 141~148
Fe-C alloy layers were produced by pulse plating and the properties were compared with those produced by D.C. plating. When the pulse on time (
) was the same, both the duty cycle and peak current density(
) had little influence on the carbon content and the hardness of the layer. The structure and hardness of the direct current plating were similar to those of the pulse current plating. However, the ductility was enhanced when the pulse current was applied due to the release of residual stress during the pulse off time(
A Study on the Infrared Radiation Properties of Anodized Aluminum
Journal of the Korean institute of surface engineering, volume 35, issue 3, 2002, Pages 149~157
Spectral emissivity depends on the surface conditions of the materials. The mechanisms that affect the spectral emissivity in anodic oxide films on aluminum were investigated. The aluminum specimens were anodized in a sulfuric acid solution and the thickness of the resulting oxide film formed changed with the anodizing time. FT-IR spectrum analysis identified the anodic oxide film as boehmite (
O). Both the infrared emisivity and reflectivity of the anodized aluminum were affected by the structure of the anodic oxide film because Al-OH and Al-O-Al have a pronounced absorption band in the infrared region of the spectrum. The presence of an anodic oxide film on aluminum caused a rapid drop in the infrared reflectivity. An aluminum surface in the clean state had an emissivity of approximately 0.2. However, the infrared emissivity rapidly increased to 0.91 as the thickness of the anodic oxide film increased.
Effect of Pulse Plating on Hardness of Brass-Alumina Nanocomposite
Journal of the Korean institute of surface engineering, volume 35, issue 3, 2002, Pages 158~164
Nanocomposites consisting of a nanocrystalline brass matrix (grain size ; 20-100nm) with sub-micron sized Al2O3 particles (60-200nm) were prepared by pulsed current electrodeposition. The microhardness of the nanocomposite with a grain size of 90-100nm was approximately 1.7 times higher than that of a comparable electrodeposit with no particles. However, significant variations in microhardness were not observed between the nanocomposites with grain sizes of 20 nm and the comparable electrodeposit.
Effect of the WC particle size and Co content on the adhesion property between AIP-TiN coating and WC-Co substrate
Journal of the Korean institute of surface engineering, volume 35, issue 3, 2002, Pages 165~171
TiN coating were deposited onto different WC-Co substrates using arc ion plating (AIP) technique. The structure and morphology for the deposited coating were characterized by x-ray diffraction (XRD) and scanning electron microscopy (SEM). The adhesion behavior of the deposited TiN coating was investigated with a conventional scratch test. Effects of WC particle size and Co content on the adhesion strength between the deposited TiN coating and substrate were studied. During the scratch test, the value of critical load was dependent of WC particle size and Co content on substrate. As the WC particle size and Co content on substrate decreased, the critical load increased. The highest critical load, approximately 110N, was obtained at WC particle size of 1
and Co content of 10wt.%.