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선형접합기를 이용한 Si∥1.3㎛-SiO₂/1.3㎛-SiO₂∥Si SOI 기판의 직접접합
송오성(O. S. Song),이영민(Y. M. Lee),이상현(S. H. Lee),이진우(J. W. Lee),강춘식(C. S. Kang) 한국표면공학회 2001 한국표면공학회지 Vol.34 No.1
10cm-diameter Si (100) ∥ 1.3㎛-SiO₂/1.3㎛-SiO₂∥Si (100) wafers were prepared using a fast linear annealing (FLA) equipment. 1.3㎛-thick SiO₂ films were grown by dry oxidation process. After cleaning and pre mating the wafers in a class 100 clean room, they were heat treated using with the FLA and conventional electric furnace. Bonded area and bond strength of wafer pairs were measured using a infrared (IR) camera and razor blade crack opening method, respectively. It was confinmed that the bonded area by FLA was around 99% and the bond strength value reached 2172mJ/㎡, which is equivalent to theoritical bond strength. Our result implies that thick SiO₂ SOI may be prepared more easily by using SiO₂/SiO₂ bonding interfaces then those of Si/SiO₂'s.
순알루미늄 V형 및 Finned Casting 의 응고에 관한 연구
김명한,강춘식,김동옥,정종연 ( M . H . Kim,C . S . Kang,D . O . Kim,J . Y . Jeong ) 한국주조공학회 1987 한국주조공학회지 Vol.7 No.1
The progression of the solidification wave front in V-section and finned casting was studied by use of the pour-out test, employed with high. Purity aluminum. The results obtained were as follows; a) The shape of solidification wave front at the inside and outside corners did not change according to solidification time, but it changes according to the corner angles at a given molding and melting condition. b) The cooling fin effect could be repserented as functions of solidification time and fin size, and this result could be applied to enhance the accuracy of the section modulus method in the design of T and V section.
7075-Al 합금에 대한 가공 열처리 효과에 관한 연구
최승철,강춘식 ( S . C . Choi,C . S . Kang ) 한국주조공학회 1981 한국주조공학회지 Vol.1 No.2
N/A In this paper tensile strength and fatigue propagation rate were investigated by aging treatment (T_6) and thermomechanical treatment (TMT) of 7075-Al Alloy specimen. The results of teat showed that TMT improved tensile strength and fatigue crack propagation due to bomogenization of microstructure. In TMT, the results of comparison between T-H`AHA and T-AHA and T-AH…and T-HA…were showed that T-AHA and T-AH… treatments, after solution treatmant, which are aging treated before rolling have higher tensile strength. Our investigation on high temperature stability at the Specimen for T_6, T-AHA, T-AH…treatments resulted in rapid reduction of tensile strength over 150℃, but the reduction of tensile strength for specimen of TMT was smoothed than T_6.
정재필,강춘식,Kang, C. S. 대한용접접합학회 1995 대한용접·접합학회지 Vol.13 No.4
In order to study the bonding mechanism of Ni/B/Ni transient liquid phase bonding system, width of liquid layers were calculated, where in this system melting point of insert material(B) is higher than bonding temperature and melting point of base metal(Ni). Caclulated values were compared with experimental ones which were measured by bonding Ni/B/Ni system at 1433-1474K under vacuum atmosphere. As results, the width of initial liquid layer of Ni/B/Ni system was calculated as $W_{IL}$ = $W_{o}$[1 + {2.100..rho.$_{S/}$ ( $X_{3}$ + $X_{4}$)..rho.$_{Ni}$ }-.rho.$_{S/}$.rho. Ni/], and it was nearly same with experimental values. Maximum width of liquid layer, width of liquid layer during isothermal solidification and isothermal solidification time were calculated also.o.o.o.
김명한,권숙인,강춘식,나달주 ( M . H . Kim,S . I . Kwun,C . S . Kang,D . J . Na ) 한국주조공학회 1987 한국주조공학회지 Vol.7 No.3
This paper presents experimental data for the computerization of green sand control. The results can be summarized as follows: 1. To obtain the proper compactability at the mixer, the addtion of moisture is far more efficient than the control of mixing time or addtion of clay. 2. The log R(% clay/% moisture) vs. log compactability curve moves upward as the amount of clay increases and moves downward as the amount of seacoal, dead bentonite or coked seacoal increases. 3. The ratio of dead to initial clay amount or coked to initial seacoal amount is changed according to sand to metal ratio, mainly, and according to pouring temperature, partly, at a shake out time of 12hrs.