• Title, Summary, Keyword: green lamination

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The green sheet properties of multilayer chip filter for mobile communication (이동통신용 적층 칩 필타 제작에서의 green sheet 특성)

  • 윤중락;이헌용
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.443-446
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    • 1997
  • This paper presents green sheet Properties of multilayer chip filter for mobile communication. The role of solid loading content and lamination conditions in determining some of the green sheet properties are present. The optimun conditions were obtained solid loading 62:38, lamination temperature 7$0^{\circ}C$, lamination press 300~400 Kg/$\textrm{cm}^2$.

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Processing of Functionally Graded Materials via Green Tape Lamination

  • Cho, Yu-Jeong;Kim, Yong-Seog
    • Proceedings of the Korean Powder Metallurgy Institute Conference
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    • pp.78-79
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    • 2003
  • A functionally graded material was produced by laminating green tapes. The lamination resulted in the formation of functionally graded structure and sintering of the materials resulted of FGM. This results demonstrated a possibility of using green tapes in the processing of functionally graded materials.

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Effects of Package Materials on Quality Change of Pine Bud Beverage Under Ultraviolet Light

  • An, Duek-Jun
    • Preventive Nutrition and Food Science
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    • v.14 no.4
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    • pp.349-353
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    • 2009
  • The effects of packaging materials on preserving the functional component of pine bud beverage stored under UV (ultraviolet) light exposure conditions were studied. The order of UV light blocking properties of the selected packages was: opaque can> opaque PET (polyethylene terepthalate) with green lamination=transparent PET with 10% PEN (polyethylene naphthalate) blending> transparent PET, and did not depend on film thickness in specified range. At 20${^{\circ}C}$, the order of preserving degree of original color and endobornyl acetate, which is quality index of pine bud beverage, was the same as above. Exposure to UV light can cause of deterioration of functional food components, but green color lamination and blending of PEN materials with transparent PET help to preserve the UV sensitive pine bud beverage components. However, the treated PET bottles have poorer preservation capabilities than the opaque cans. Transparent PET with PEN blending, in particular, will be very useful packaging material for colorful functional beverage preservation by helping to protect the ingredients while attracting consumer attention.

Shaping and Sintering of $Pb(Mg_{1/3}Nb_{2/3})O_3-PbTiO_3$ System powders by Slurry Process (Slurr법에 의한 $Pb(Mg_{1/3}Nb_{2/3})O_3-PbTiO_3$계 미분말의 성형과 소결성)

  • 김복희;최석홍
    • Journal of the Korean Ceramic Society
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    • v.33 no.11
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    • pp.1267-1275
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    • 1996
  • Green sheet was prepared by tape casting in the composition of (1-x)Pb(Mg1/3Nb2/3)O3-PbTiO3 system using Pb(Mg1/3Nb2/3)O3 and PbTiO3 synthesized with PbO, Nb2O5 MgO and TiO2 The densest green sheet was obtained in the weight ratio 70:30 of powder to binder. Green sheet wasmultilayered in metal mould and formed into lamination at 7$0^{\circ}C$, 300kg/cm2 The lamination was sintered at 110$0^{\circ}C$ 2hr, Dielectric constant and Curie temperature of disc type sintered body was highered with increasing the amount of PbTiO3 and was in the range of 19000-21000, -7~45$^{\circ}C$ respectively. Green and sintered relative density of lamination was 61% and 95% respectively.

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Changes of Camber on Lamination Conditions in alumina/Tungsten Cofiring Multilayer Package (알루미나/텅스텐 동시소성에 의한 다층 팩키지 제조시 적층조건에 따른 camber의 변화)

  • 성재석;구기덕;윤종광;이상진;박정현
    • Journal of the Korean Ceramic Society
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    • v.34 no.6
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    • pp.601-610
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    • 1997
  • In cofiring of multilayered alumina with tungsten, the change of camber with lamination condition was experimented and the effect of sintering shrinkage of alumina and tungsten was investigated. From the exact measurement of sintering shrinkage of tungsten thick film, as lamination pressure increased, the sintering shrinkage of alumina decreased but that of tungsten thick film was not changed. So it was though that the main factor which induced the sintering shrinkage difference between ceramics and metal with lamination condition was the change of sintering shrinkage of ceramics. In case of high lamination pressure, high green sheet density, the cofired specimen showed low camber due to low shrinkage difference between alumina and tungsten and there was a linear relation between camber and shrinkage difference. It was found that this shrinkage difference could change the thickness of tungsten film and the microstructure within via hole during cofiring.

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Effect of Binder Content on Physical Properties of LTCC Green Tapes (바인더 함량 변화가 LTCC 그린 테이프의 물리적 특성에 미치는 영향)

  • You, Jung-Hoon;Yeo, Dong-Hun;Lee, Joo-Sung;Shin, Hyo-Soon;Yoon, Ho-Gyu;Kim, Jong-Hee
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.19 no.12
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    • pp.1112-1117
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    • 2006
  • The properties of LTCC green tape with addition of binder were investigated in order to understand an effects of binder on multilayer processing. A green sheet form was fabricated through tape casting method with the MLS-22 powder. The lamination density increased with increasing amount of binder and lamination pressure. With increasing amount of binder, the elongation of ceramic sheets increased but the tensile stress and air-permeability decreased. The addition of excessive binder is caused defects in the green sheet during via hole punching. The optimum condition of the via hole without defects was observed from amount of the binder 10 wt%.

Influence of Laminating and Sintering Condition on Permittivity and Shrinkage During LTCC Process (LTCC 공정 중 적층 및 소결이 유전율과 회로 형상에 미치는 영향)

  • Jeong, M.S.;Hwang, S.H.;Chung, H.W.;Rhim, S.H.;Oh, S.I.
    • Transactions of Materials Processing
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    • v.16 no.5
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    • pp.396-400
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    • 2007
  • LTCC(Low Temperature Co-fired Ceramic) which offers a good performance to produce multilayer structures with electronic circuits and components has emerged as an attractive technology in the electronic packaging industry. In LTCC module fabrication process, the lamination and the sintering are very important processes and affect the electrical characteristics of the final products because the processes change the permittivity of ceramics and the dimension of the circuit patterns which have influences on electronic properties. This paper discusses the influence of lamination pressure and sintering temperature on the permittivity and the dimensional change of LTCC products. In the present investigation, it is shown that the permittivity increases along with increasing of the lamination pressure and the sintering temperature.

Influence of laminating and sintering condition on permittivity and shrinkage during LTCC process (LTCC 공정 중 적층 및 소결이 유전율과 회로 형상에 미치는 영향)

  • Jeong, M.S.;Hwang, S.H.;Chung, H.W.;Rhim, H.S.;Oh, S.I.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.67-70
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    • 2007
  • LTCC (Low Temperature Co-fired Ceramic) has been emerged as a promising technology in packaging industry. In this technology the lamination and the sintering process are very important because they change the permittivity of ceramics and the dimension of metal pattern which have influences on electric property. In this paper we studied on influence of the permittivity and the dimension change by lamination pressure and sintering temperature of LTCC process. As a results, permittivity increase along with increasing of lamination pressure and sintering temperature.

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Experimental Study on the Deformation of MLCC Compressed Bar by Quantitative Analysis for Outgas (Outgas 분석을 통한 MLCC Bar 변형률 측정)

  • Kim, Min-Ju;Kim, Jong-Yun;Jeong, Gi-Ho;Park, Chang-Sik
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.23 no.6
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    • pp.458-463
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    • 2010
  • MLCC (multi-layer ceramic capacitor) is usually fabricated by lamination of predetermined number of single layers. Often, the state of MLCC before sintering is called the green state, whose strength comes from the adhesion between the dielectric material and the polymer binder. Therefore the lamination of a single layer before sintering can be easily deformed by environment due to the relatively lower strength. After the compression process, which helps single sheets cohereto with adjacent sheets, the MLCC green bar is preheated to resolve the probable internal stress. Unfortunately, unexpected deformation after preheating resulted in problems during cutting of the MLCC green bar. In this study, one of 2 primary hypotheses which were proposed to resolve the unexpected deformation after preheating was examined by quantitative experiment with GC/MS (gas chromatograpy/mass spectrometer). The proportion of deformation caused by DOP evaporation, which was primarily evaporated componet during preheating, to the total deformation of the MLCC green bar was found to be 53%.

Control of Physical Properties in Green Sheets and Matching with Ag-Pd Electrode (적층 액츄에이터용 그린시트의 물성 및 전극 Matching성 제어)

  • Lim, Chang-Bin;Hyun, Se-Young;Yeo, Dong-Hun;Shin, Hyo-Soon;Hong, Youn-Woo;Cho, Yong-Soo
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.329-329
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    • 2010
  • 적층 액츄에이터는 우수한 압전특성 및 그 재료가 가진 고유한 특성 때문에 최근 이동통신 단말기용 햅틱 소자 및 PC 와 그 주변기기로 수요가 폭발적으로 증대되고 있으며, 향후에도 CATV 네트워크와 무선통신기기를 비롯한 디지털 통신분야로 응용분야가 확대되리라 예상된다. 적층 액츄에이터에서 발생되는 에너지는 세라믹 그린시트 두께와 전극 면적에 비례하여 변위 및 응력이 증가하게 되므로 고적층형에 대한 필요성이 증대되고 있다. 이러한 고적층 액츄에이터의 경우 소성과정에 서 warpage 및 de-lamination 같은 결함이 발생하기 쉬우므로 그린시트의 균일성 및 전극과의 matching성 확보가 중요한 요소이다. 본 연구에서는 슬러리의 분산성과 시트 내 유기물 함량 최적화 실험을 진행하여 적층 액츄에이터용 그린시트를 최적화 한 후 공정 적용성 및 저온소성 전극인 Ag-Pd 전극과의 매칭성을 확보하고자 하였다. 이러한 후막공정 기술 개선을 통해 적층 액츄에이터를 제조하여 압전 특성을 측정하였다.

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