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신윤석(Yun-Seok Shin),이상필(Sang-Pill Lee),이진경(Jin-Kyung Lee) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
The mechanical properties of SiC<SUB>f</SUB> / SiC composites reinforced with continuous SiC fiber have been investigated in conjunction with the detailed analysis of their microstructure. The effect of heat treatment on the characterization of monolithic SiC materials was also examined. SiC<SUB>f</SUB> / SiC composites was fabricated by the reaction sintering process using a braiding Hi - Nicalon SiC fiber. The complex matrix slurry was prepared by different composition ratios of SiC and C particles. The characterization of RS-SiC and RS - SiC<SUB>f</SUB> / SiC composites materials was investigated by means of SEM, EDS and three point bending test. Based on the of mechanical property-microstructure correlation, the high temperature properties of RS - SiC<SUB>f</SUB> / SiC composites was discussed for the applicability of structural material in the fusion power plant.
소결조제 혼합비에 따른 액상소결 탄화규소 재료의 강도특성
신윤석(Yun-Seok Shin),이상필(Sang-Pill Lee),이진경(Jin-Kyung Lee) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.3
This paper dealt with the fabricating process of liquid phase sintered (LPS) SiC ceramics, in conjunction with the detailed analysis of their microstructure and mechanical properties. The sintering additives used for LPS-SiC materials was a Al₂O₃-Y₂O₃ system. The compositional ratios of Al₂O₃/ Y₂O₃ additive for the fabrication of LPS-SiC materials were 0.4, 0.7, 1.5 and 2.3, respectively. The Total amount of additive materials (Al₂O₃ + Y₂O₃) was fixed as 10 wt%. These mixed powders were sintered at the temperatures a of 1780, 1800 and 1820℃ under an applied pressure of 20 ㎫ and a pressure holding time of 2hours. LPS-SiC materials fabricated at the temperature of 1820℃ and additive of compositional ratio 1.5, represented a theory density of about 98% and a flexural strength of about 900 ㎫.
신윤석(Yun-Seok Shin),김영호(Young-Ho Kim),이상필(Sang-Pill Lee),이진경(Jin-Kyung Lee) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
SiC ceramics have been fabricated by a liquid phase sintering(LPS) process, using SiC powder with an average size of about 0.3㎛. The sintering additive used for LPS-SiC ceramics was a Al₂O₃-Y₂O₃ system. These mixed powders were sintered at the temperatures a of 1780, 1800 and 1820 ℃ under an applied pressure of 20 ㎫ and a pressure holding time of 2hours. The density of LPS-SiC was measured by the Archimedes' method. The three point bending test was carried out to evaluate mechanical properties of LPS-SiC ceramics. LPS-SiC ceramics fabricated at the temperature of 1820 ℃ represented a density of about 3.1g/cm3 and a flexural strength of about 780 ㎫. However, such a strength greatly decreased after the heat treatment of 1400 ℃ and 10 hours.
MoSi₂ 금속간화합물의 열충격 및 비파괴 평가에 관한 연구
김영호(Young-Ho Kim),임채호(Chae-Ho Lim),신윤석(Yun-Seok Shin),이상필(Sang-Pill Lee),이진경(Jin-Kyung Lee) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
The present work dealt with the effect of cyclic thermal shock on the variation of density, microstructure and flexural strength properties of sintered MoSi₂ materials, in order to examine their application or stability at the high temperature. Especially, the efficiency of nondestructive technique using the ultrasonic wave was investigated for the evaluation of material damage behaviors suffered from the cyclic thermal shock. Ultrasonic wave velocity was decreased with the thermal shock cycle, and the attenuation increased linearly.