http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 이지환 ( In Dong Yeo (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
-
용탕단조법에 의한 δ-Alumina 단섬유강화 AC4C 기 복합재료의 계면반응에 관한 연구
여인동,이지환 ( In Dong Yeo,Chi Hwan Lee ) 한국주조공학회 1994 한국주조공학회지 Vol.14 No.4
N/A This paper has been examined for the interfacial reactions in δ-Al₂O₃short fiber-reinforced AC4C matrix composite materials after squeeze casting and thermal exposure. After squeeze casting, it was found that reaction products exist on the Al₂O₃short fiber surface in both composites with and without silica binder. After thermal exposure at 450℃ for 30min, the thickness of reaction zone was significantly increased; Al₂O₃short fiber morphology was observed to be rough due to interfacial reaction compared with squeeze cast specimen. STEM and XRD observation and analysis showed that reaction product appears to be MgAl₂O₄.
-
용탕단조법으로 제조된 Al2O3 / AC4C 복합재료의 피로균열 전파거동에 관한 연구
여인동,이지환 ( In Dong Yeo,Chi Hwan Lee ) 한국주조공학회 1995 한국주조공학회지 Vol.15 No.4
N/A This study has been conducted with the purpose of examining the fatigue crack growth characteristics of Al₂O₃short fiber reinforced aluminum matrix composites made by squeeze casting process with different applied pressure and binder amount. Fatigue crack growth experiments have been performed under constant load amplitude method with a fixed load ratio. The rate of crack propagation was decreased with binder amount as well as applied pressure. Also fatigue crack growth path in matrix was changed from flat to rough mode with an increase of applied pressure. In the composites, fatigue crack was propagated to interface between matrix and reinforcement at 10㎫, but it was propagated to reinforcement at 20㎫. The major reason of thee result was considered that interfacial bonding force and microstructure of matrix were improved due to an increase of applied pressure. Localized ductile striation in the composites was observed at low growth rate region and such a phenominon was remarkable with an increase of applied pressure. At high growth rate region, the propensity of fracture appearance was changed from interfacial debonding to reinforcement fracture with an increase of applied pressure.
-
용탕단조법에 의한 Alumina 단섬유강화 AC4C 기 복합재료의 인장강도에 미치는 점결제 및 가압력의 영향
여인동,이지환 ( In Dong Yeo,Chi Hwan Lee ) 한국주조공학회 1995 한국주조공학회지 Vol.15 No.2
N/A The mechanical properties of Al/Al₂O₃composites have been investigated in relation with manufacturing factors such as applied pressure of casting and binder amount of preform. It was found that tensile strength increases with an increase of applied pressure, but decreases with binder amount. Increase of tensile strength is attributable to refinement of microstructure, improvement of intefacial bonding between Al₂O₃short fiber and matrix, decrease of porosity in the matrix. Due to the high thermal stability of alumina short fiber, tensile strength of composites at 150℃ was superior to matrix alloy at room temperature. To evaluate the strength of composites, modified Kelly-Tyson`s equation was introduced. Manufacturing factor M was obtained calculating from experimental data. M values were increased with applied pressure, but decreased with binder amount. The initiation of microcrack appeared to be at interface and reinforcement colony. Amount of micro-dimple was increased with applied pressure, and interfacial debonding phenomenon was remarkable with an increase of binder amount.
ScienceON연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
