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Nb/MoSi<sub>2</sub> 접합재료의 계면 수정 및 특성
이상필,윤한기,Lee, Sang-Pill,Yoon, Han-Ki 대한기계학회 2003 大韓機械學會論文集A Vol.27 No.7
This study dealt with the suppression of interfacial reaction between Nb and MoSi$_2$ for the fabrication of high toughness Nb/MoSi$_2$ laminate composites, based on the results of a thermodynamical estimation. Especially, the effect of ZrO$_2$ particle on the interfacial reaction of Nb/MoSi$_2$ bonding materials has been examined. Nb/MoSi$_2$ bonding materials have been successfully fabricated by alternatively stacking matrix mixtures and Nb sheets and hot pressing in the graphite mould. The addition of ZrO$_2$ particle to MoSi$_2$ matrix is obviously effective for promoting both the interfacial reaction suppression and the sintered density of Nb/MoSi$_2$ bonding materials, since it is caused by the formation of ZrSiO$_4$ in the MoSi$_2$-ZrO$_2$ matrix mixture. The interfacial shear strength of Nb/MoSi$_2$ bonding materials also decreases with the reduction of interfacial reaction layer associated with the content of ZrO$_2$ particle and the fabrication temperature.
Nb/MoSi<sub>2</sub>적층복합재료의 제조 및 파괴특성
이상필,윤한기,Lee, Sang-Pill,Yoon, Han-Ki 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.6
The impact value, the interfacial shear strength, the tensile strength and the fracture strain of Nb/MoSi$_2$laminate composites, which were associated with the interfacial reaction layer, have been investigated. Three types of Nb/MoSi$_2$ laminate composites alternating sintered MoSi$_2$ layers and Nb foils were fabricated as the parameter of hot press temperature. The thickness of interfacial reaction layer of Nb/MoSi$_2$ laminate composites increased with increasing the fabrication temperature. The growth of interfacial reaction layer increased the interfacial shear strength and led to the decrease of impact value in Nb/MoSi$_2$ laminate composites. It was also found that in order to maximize the fracture energy of Nb/MoSi$_2$ laminate composites, interfacial shear strength and the thickness of interfacial reaction layer must be secured appropriately.
Nb/MoSi₂ 적층복합재료의 경도특성에 미치는 제조온도의 영향
이상필(Lee Sang-Pill),윤한기(Yoon Han-Ki) 한국해양공학회 1999 韓國海洋工學會誌 Vol.13 No.4
Hardness characteristics and microstructures of Nb/MoSi₂ laminate composites were evaluated from the variation of fabricating conditions such as preparation temperature, applied pressure and pressure holding time. Nb/MoSi₂ laminate composites composed of MoSi₂ powder and Nb sheets were fabricated by the hot press. From experimental results, it was found that the lamination from Nb sheet and MoSi₂ powder was an excellent strategy to improve hardness characteristics of monolithic MoSi₂. However, interfacial reaction products like(Nb, Mo)SiO₂ and Nb2Si₃ formed at the interface of Nb/MoSi₂ and increased with fabricating temperature.
이상필(Sang Pill Lee),이문희(Moon Hee Lee),문승현(Seung Hyun Moon) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
This characterization of liquid phase sintered(LPS) SiC materials was studied for the elements of the high pressure valve. Especially, the effect of starting SiC particle size on the mechanical properties and microstructure was investigated, in conjunction with detailed analyses by SEM, XRD, bending test. The LPS-SiC materials were fabricated with the starting SiC particle sizes of 30㎚, 0.3㎛, 3.0㎛, respectively. The sintering additives were added to SiC particles with the constant composition ratio(Al₂O₃/Y₂O₃) of 1.5. The LPS-SiC materials were sintered by hot-pressing method at the temperature of 1820℃ under a argon atmosphere. The sintered LPS-SiC materials were shown dense morphology with the creation of a secondary phase. The increase of starting SiC particle sizes cause the degradation of the flexural strength with the increase of the micropores. In this study, the characterization of LPS-SiC materials was also examined by using nondestructive technique.