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세라믹 Package 봉착용 유리의 결정화에 관한 연구
손명모,박희찬,이헌수,강원호,Son, Myeong-Mo,Park, Hi-Chan,Lee, Hun-Su,Gang, Won-Ho 한국재료학회 1991 한국재료학회지 Vol.1 No.4
PbO 77-80wt%, ZnO 4.5-6wt%, $B_2O_3$ 7.5-8.5wt%, $TiO_2$ 3-7wt%, $P_2O_5$ 0.5-2wt%의 조성을 갖는 IC Package봉착용 저융점($400-460^{\circ}C$) 결정화유리 frit를 제조하였다. DTA-TMA, X-선 회절분석, SEM 등을 이용하여 봉착용 유리의 결정화 특성을 연구하였다. $TiO_2$ 함량이 3wt% 함유시료는 $420-440^{\circ}C$에서 $2PbO{\cdot}ZnO{\cdot}B_2O_3$의 결정이 균일성장하였다. $TiO_2$ 함량이 4wt% 첨가된 시료는 $420-440^{\circ}C$에서 $2PbO{\cdot}ZnO{\cdot}B_2O_3와\;PbTiO_3$ 결정이 섞여서 혼합결정을 이루고 있었다. 또한 $TiO_2$ 5wt% 첨가된 시료는 $440-460^{\circ}C$에서 perovskite $PbTiO_3$ 결정만 석출되었다. The crystallized solder glasses with the low melting temperature for electronic package were prepared with the compositions of 77-80wt% PbO, 4.5-6wt% ZnO, 7.5-8.5wt% $B_2O_3$, 1-2wt% CaO, and 0.5-2.0wt% $P_2O_5$ containing 3-7wt% $TiO_2$. The Characterization of the solder glasses were studied using DTA, SEM and XRD. Frit containing 3wt% $TiO_2$ had crytallzation temperature range of $420-440^{\circ}C$. The major crystalline phase was identified as $2PbO{\cdot}ZnO{\cdot}B_2O_3$ by X-ray diffraction. Frits containing 4 wt% $TiO_2$ consisted of crysalline Phases of $PbTiO_3$ and $2PbO{\cdot}ZnO{\cdot}B_2O_3$ in the temperature range of $420-440^{\circ}C$, When g1ass frit containing 5wt% $TiO_2$ were heat-treated in the temperature range of $440-460^{\circ}C$, major crytalline phase was perovskite lead titanate.
플라즈마 처리에 의한 폴리비닐리덴플로라이드 나노섬유의 젖음성
이승훈,장선호,소윤미,이헌수,양철민,윤중현,김찬,Lee, Seung-Hoon,Jang, Seon-Ho,So, Yun-Mi,Lee, Hun-Su,Yang, Cheol-Min,Yun, Jung-hyun,Kim, Chan 한국섬유공학회 2018 한국섬유공학회지 Vol.55 No.1
Poly(vinylidene fluoride) (PVDF) is a critical polymeric material used in the mass production and application of electrospun nanofibers, and is popular due to its excellent properties. However, electrospun PVDF nanofibers are very hydrophobic and possess low surface energies, limiting their broad application. In this work, we investigated practical methods for the hydrophobic surface modification of PVDF nanofibers using four techniques: radio-frequency (RF) and PIN-type atmospheric plasmas, planar inductively coupled plasma (ICP), and planar capacitively coupled plasma (CCP). The use of RF atmospheric plasma was ineffective under the experimental conditions used, while the PIN-type atmospheric plasma efficiently modified PVDF nanofiber surfaces locally. The application of planar CCP to PVDF nanofibers was more effective than planar ICP for the same experimental conditions. In particular, the water contact angles of samples treated with planar CCP for 600 s and 900 s were $25^{\circ}$ and $10^{\circ}$ respectively, and wettability improved. Analysis with FT-IR, XPS, and FE-SEM showed that the surface CF and CH hydrophobic groups were destroyed without damaging the PVDF nanofibers, and hydrophilic species such as C=O, OH, and COOH were formed. As a consequence, quantitative analysis of nanofiber chemical composition is necessary when treated by plasmas, providing insight into the correlation of specific property changes with processing conditions, and indicating precise research results and application examples.