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송휴섭,김상우,장성도,손용배 한국세라믹학회 1990 한국세라믹학회지 Vol.27 No.3
The densification behaviro and resulting properties of cordierite-aluminium titanate composites containing 5 to 40wt.% aluminium titanate were investigated. Compared with cordierite monolithics a substantial increase of sintering temperature range for composites was observed, which was due to the formation of cordierite and glass phase at relatively low temperatures. The bending strength of composites showed its maximum at 30wt.% aluminium titanate content, which was about 50% increase relative to the cordierite monolithics, then decreased by a small amount at 40wt.% aluminium titanate content. The decrease was explained by the increase of microcracks whose presence was confirmed by the hysteresis of thermal expansion curve of composites. However, the microcracks formed was not severe enough to produce a significant decrease in strength, which was also evidenced by the continuous increase of thermal expansion coefficient up to 40wt.% aluminium titanate content.
송휴섭,장성도,S.J. Bless 한국세라믹학회 1995 한국세라믹학회지 Vol.32 No.3
The ballistic efficiency of alumina tiles with various sizes, shapes, and target configurations was measured by the thick backing plate technique. The ballistic efficiency of square tiles roughly 8 mm thick struck by 12.7mm diameter bullets rapidly increased with tile size up to about 100mm, then tended to saturate. Circular shape tiles had lower ballistic efficiencies than those of square shape tiles for the same width and thickness. Small tiles (50mm) that were recessed in aluminum wells had a significantly higher ballistic efficiency than tiles placed on a flat surface. However, the difference in the ballistic efficiency between the two target configurtions became small at larger tile sizes. All the results could be explained by the effect of reflected waves at edges and the propagation of resulting cracks on the penetration process.
송휴섭 한국세라믹학회 1993 한국세라믹학회지 Vol.30 No.2
The effects of silane coupling agents on the injection molding process were investigated using silicone nitride mixtrues with a binder system containing polypropylene as a major binder (55vol% solid loading). The formation of bonding between silicon nitride powder and coupling agents was confirmed through the analyses of powder surface. The use of coupling agents improved mixing characteristics judged by the torque change during mixing process. the coupling agents also reduced molten viscosity of the mixture considerably, which is a main factor to determine the flow of the mixture. However, the bonding between coupling agents and polymers had a negative effect on the debinding process by retarding the thermal decomposition.
Design Principles of Co-Planar Interdigitated Micro-Electrode Arrays for Solid-State Ionic Devices
김형철,송휴섭 한국정밀공학회 2014 International Journal of Precision Engineering and Vol.1 No.4
Comprehensive analyses on the complex ion transport of co-planar interdigitated microelectrode arrays in solid-state ionic devices were carried out using finite element and analytical methods. We found that the ion flux between anode and cathode was constricted on the edges of both electrodes. Based on these results, we defined/analyzed the effective length and ohmic area-specific-resistance of various cell configurations (i.e., electrode width and electrolyte thickness). Using the relation between the effective length and the ohmic area-specific-resistance, we found an analytical model having favorable agreement with the finite element results and propose design rules for high-performance and densely integrated devices.
혼합분말의 과립특성이 가압소결 탄화규소 휘스커/알루미나 복합재료의 기계적 물성에 미치는 영향
이해원,송휴섭 한국세라믹학회 1994 한국세라믹학회지 Vol.31 No.12
Mechanical properties of hot-pressed SiC whisker/Al2O3 composites were strongly dependent on the granular characteristics of mixed powder, which were controlled by co-dispersion condition, the existence of steric barrier on whisker surface, and granulating method, etc. Heat-treatment of SiC whiskers at $700^{\circ}C$ for 1 hr in air was very effective both for achieving dispersion stability of whiskers with PVA adsorption and for obtaining excellent mechanical properties of resulting composites. It is believed from the fractography of composites prepared with various whisker dispersion conditions that the most common fracture origin of Al2O3 agglomerate could be attributed to whisker clusters arising due to flocculation. Further improvement of mechanical properties of composites were achieved by hot pressing green tapes prepared by Doctor-blade process, which promoted two-dimensional random alignment of whiskers.
손지원,송휴섭 한국정밀공학회 2014 International Journal of Precision Engineering and Vol.1 No.4
The influence of the area difference between the current collector and the thin-film-processed cathode on the performance evaluation of the solid oxide fuel cell (SOFC) is investigated. Two 2 cm by 2 cm anode supported SOFCs with a 1 cm by 1 cm cathode (Cell-1.0) and a 1.5 cm by 1.5 cm cathode (Cell-2.25) are fabricated and the performances are measured in a button cell test set-up with a cathode current collection area of 1 cm by 1 cm. Significantly different cell power outputs are measured. The total power output of the Cell-2.25 is 1.35~1.68 times to that of the Cell-1.0. The discrepancy is considered to originate from two major reasons: 1. limited lateral conduction and 2. thin thickness of the cathode. The cell performance can be overestimated when the smaller area is chosen, or underestimated when the larger area is chosen as the active area between the current collection area and the cathode area. The present study identifies another important factor to be considered to exactly assess the performance of the SOFC implementing thin-film-processed electrode.
Doctor blade 공정에 의한 세라믹스 열교환기 소자의 제조
김상우,송휴섭,장성도 한국세라믹학회 1992 한국세라믹학회지 Vol.29 No.3
The effects of slip composition and processing conditions on the fabrication of ceramic heat exchanger cores by doctor blade process were investigated. Since the effects of those two variables were inter-dependent, the effects of binder system, binder plus plasticizer, were extensively studied for a limited range of processing conditions and a pre-determined ceramic composition. The content of binder system and the ratio of binder to plasticizer were identified as main variables to affect densities and mechanical properties of green sheets, compressive properties and bond strengths of laminates, and shrinkages and their anisotropy of sintered laminates. However, sintered densities and water absorptions of laminates were not influenced by either the content of binder system or the ratio of binder to plasticizer, when the debinded laminates had a relatively high density (relative density of >55% in this study).