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Silane Coupling제로 표면 처리된 ATO 나노입자를 이용하여 제조된 대전방지 ATO/EPOXY 복합체의 코팅 물성
유요한,김태영,김종은,서광석,You, Yo-Han,Kim, Tae-Young,Kim, Jong-Eun,Suh, Kwang-S. 한국전기전자재료학회 2008 전기전자재료학회논문지 Vol.21 No.4
For purpose of anti-static film remaining unchanged in the condition of $160^{\circ}C$, organic solvent, acid and base solution $0.01\sim0.03{\mu}m$ particles of Sb doped tin oxide(ATO) were grafted by 3-Glycidyloxypropyltrimethoxysilane(GPTS) for improving interfere bonding force between ATO and epoxy resin. The particles were dispersed in 2-methoxyethanol with YD-I28(Bisphenol A type epoxy resin, Kukdo chemical) and 1-imidazole as hardener. The anti-static solutions were coated on PI film as thickness of $0.1{\mu}m$. Surface resistivity of anti-static film containing conductive polymer became $10^{12}\Omega/\Box$ after 32 hours in $160^{\circ}C$. The surface resistivity of ATO grafted by GPTS / Epoxy coating layer remained as $10^{7.6}\Omega/\Box$ in $160^{\circ}C$ for 7 days. ATO grafted by GPTS / Epoxy coating layer coated on PI film was dipped in acetone for 7 days. The surface resistivity remained unchanged as $10^{7.6}\Omega/\Box$. The anti-static layer dipped in water solutions containing each KOH 10 wt % and $H_2SO_4$ 2 wt% was ultra-sonicated for 10 minutes per once until 30th. The surface resistance of anti-static layer containing ATO grafted by GPTS remained unchanged.
남기한(Ki Han Nam),유계현(Kye Hyeon Ryu),유요한(Yo Han You) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Calibration facility at high Reynolds number flow was designed and fabricated, for calibrating the flowmeter used for feedwater flow measurement in a nuclear power plant. Conditions of the feedwater flow are under the temperature 230 ℃ and the pressure 8 M Pa. Four ultrasonic flowmeters, which have 3000 m3/h maximum flowrate respectively, were calibrated against both gravimetric flow calibrator and pipe type ball prover. We have achieved the maximum flowrate 12000 m3/h with parallelly connected four ultrasonic flowmeters. To get the high Reynolds number flow, the fluid temperature was controlled up to 90 ℃. Then we can get Reynolds number 2.5x107, which was coincide with that of APR 1400(Advance Power Reactor 1400 ㎿) nuclear power plant model. Two different principle flow calibrator, gravimetric system and ball prover, which have the traceability from national standard of mass and volume respectively, were crossly used and checked for the estimation of ultrasonic flowmeters. The target uncertainty of this calibrator was 0.08 %, which was estimated with ISO recommendations. For increasing the reliability of estimated uncertainty, the inter comparison with other calibrator at high Reynolds number was planned. The system will be apply to solve the MUR(Measurement Uncertainty Recapture) issue in feedwater flow measurement.