• Title/Summary/Keyword: Low binders

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Fabrication of Low Temperature Cofired Ceramic (LTCC) Chip Couplers for High Frequencies : I, Effects of Binder Burnout Process on the Formation of Electrode Line (고주파용 저온 동시소성 세라믹(LTCC)칩 커플러 제조: I. 전극형성에 대한 결합제 분해공정의 영향)

  • 조남태;심광보;이선우;구기덕
    • Journal of the Korean Ceramic Society
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    • v.36 no.6
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    • pp.583-589
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    • 1999
  • In the fabrication of ceramic chip couples for high frequency application such as the mobile communication equipment the formation of electrode lines and Ag diffusion were investigated with heat treatment conditions for removing organic binders. The deformation and densification of the electrode line greatly depended on the binder burnout process due to the overlapped temperature zone near 400$^{\circ}C$ of the binder dissociation and the solid phase sintering of the silver electrode. Ag ions were diffused into the glass ceramic substrate. The Ag diffusion was led by the glassy phase containing Pb ions rather than by the crystalline phase containing Ca ions. The fact suggests that the Ag diffusion could be controlled by managing the composition of the glass ceramic substrate.

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solidification/Stabilization of Hazardous Wasted Using Cementitious Material(I) (특수시멘트 고화재를 이용한 지정폐기물의 고형화/안정화(I))

  • Lim, C.Y.;Paik, S.H.;Um, T.S.;Choi, L.;Oh, B.H.;Lee, K.H.
    • Proceedings of the Korea Concrete Institute Conference
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    • 2000.04a
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    • pp.205-210
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    • 2000
  • This study concerns the cement-solidification. stabilization of the electric furnace dust. Compressive strength and leaching test of heavy metals were evaluated for varing types and ratios of cements and the effect of some additives of hauyne clinker and slag were also discussed. In this cases of using cement binders more than 30%, the compressive strength showed the values over 150kgf/cm2. so it can be used as filler for concrete precastings. Type III cement and Hauyne clinker improved the compressive strength, especially early strength. Leaching amount of heavy metals was decreased when using type III cement and adding hauyne clinker and slag. The values were especially low in the case of slag addition.

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Study on Carbon Nano Fiber Emitter for Field Emission Lamp (전계방출광원용 카본나노파이버 에미터 연구)

  • Kim, Kwang-Bok;Lee, Sun-Hee;Yu, Seung-Ho;Kim, Dae-Jun;Kim, Yong-Won
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2008.05a
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    • pp.21-24
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    • 2008
  • Properties of carbon nano fiber (CNF) as field emitters were described. Carbon nano fiber (CNF) of herringbone was prepared by thermal chemical vapor deposition(CVD). Field emitters mixed with organic binders, conductive materials and were prepared by screen-printing process. In order to increase field emissions, the surface treatment of rubbing & peel-off was applied to the printed CNF emitters on cathode electrode. The measurements of field emission properties were carried out by using a diode structure inline vacuum chamber. CNF of herringbone type showed good emission properties that a turn on field was as low as 2.1 $V/{\mu}m$ and current density was as large as 0.15 $mA/cm^2$ of 4.2 $V/{\mu}m$ with electric field. Through the results. we propose that CNFs are suitable for application of electron emitters in Field Emission Devices.

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Properties Strength and Autogenous Shrinkage on the Ultra High Performance Concrete by Fiber Type and Pre-mix Binder (섬유종류 및 결합재의 프리믹스에 따른 초고성능콘크리트의 강도 및 자기수축 특성)

  • Gu, Gyeong-Mo;Hwang, In-Seong;Kim, Won-Gi
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2018.05a
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    • pp.275-276
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    • 2018
  • Ultra high performance concrete(UHPC) represents high early age autogenous shrinkage strain due to its low water-to-binder ratio(W/B) and high fineness admixture usage. It has been reported that fiber can control restrained tensile stress and crack. The purpose of the present study is, therefore, to investigate the autogenous shrinkage as well as mechanical properties including compressive strength, flexural strength and modulus of elasticity on the UHPC with fiber type and pre-mix of binder.

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Study on the Optimization of Cationic Ring Opening Polymerization of Silicone-Based Epoxy Monomers for Holographic Photopolymers

  • Kim, Dae-Heum;Chung, Dae-Won
    • Macromolecular Research
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    • v.17 no.9
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    • pp.651-657
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    • 2009
  • This study examined the optimum compositions of binder, photo-acid generator (PAG) and sensitizer for the cationic ring opening polymerization of 1,3-bis[2-(3-{7-oxabicyclo-[4.1.0]heptyl})]-tetramethyldisiloxane in the presence of polydimethylsiloxane with four epoxide moieties as a co-monomer. When diffractive efficiency (DE) values were compared quantitatively to analyze the effect of the binder on holographic photopolymerization, DE was affected by the viscosity of the binders and miscibility with the monomer mixture. Extremely low DE values were observed when the immiscible dimethyl silicone was used as a binder. Therefore, methylphenyl silicone, which is miscible with the monomer mixture, was used as the binder for further studies. The optimal conditions were a binder viscosity between 250 to 390 cP, and contents of the binder, PAG, and sensitizer were 75-125 wt%, > 6 wt% and 0.05 wt% to the total monomer mixture, respectively.

An Angle-Binder Drawbead Simulator for Measuring Drawbead Forces on Inclined Binder Surface (경사진 바인더면의 드로우비드력을 측정하기 위한 모의실험장치)

  • Yang, W.H.;Choi, K.Y.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2009.05a
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    • pp.180-184
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    • 2009
  • A novel set of experimental test tooling for measuring pulling and holding forces for drawbeads on binders inclined at a wide range of angles is introduced. A mechanical design featuring a single load cell, a male-female draw bead set, translation and rotation degrees of freedom, and a screw-driven clamping system has been incorporated into a standard tensile test machine. On a real time basis, restraining and holding force data with respect to draw-in displacement may be directly downloaded into a PC for data processing. The proposed experimental system represents a significant breakthrough in drawbead simulation technology due to its relatively low cost, clever design, and versatility. The system is shown to yield excellent experimental data suitable for verifying theory and numerical model predictions.

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Soft-magnetic Characteristics of Co-based Amorphous Powder Produced by Spinning Water Atomization Process (SWAP)

  • Otsuka, I.;Wada, K.;Watanabe, A.;Kadomura, T.;Yagi, M.
    • Proceedings of the Korean Powder Metallurgy Institute Conference
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    • 2006.09b
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    • pp.784-785
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    • 2006
  • Co-based amorphous powder was produced by a new atomization process "Spinning Water Atomization Process (SWAP)", having rapid super-cooling rate. The composition of the alloys was ($(Co_{0.95}Fe_{0.05})_{1-x}Cr_x$)$_{75}Si_{15}B_{10}$ (x=0, 0.025, 0.05, 0.075). The powders became the amorphous state even if particle size was up to about $500{\mu}m$. The coercive force of powders was about 0.35 - 0.7 Oe. Furthermore, Co-based amorphous powder cores with glass binders were made by cold-pressing and sintering methods. The initial permeability of the core in the frequency range up to 100 kHz was about 110, and the core loss at 100 kHz for Bm = 0.1 T was $350kW/m^3$.

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Overview on Development for Thermoplastic Solid Propellants (열가소성 고체추진제 개발 현황)

  • Cho, Joonhyun;Heo, Jinwook;Kim, Dukhyun;Lee, Hyoungjin
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2017.05a
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    • pp.495-497
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    • 2017
  • Thermoplastic propellants using thermoplastic elastomer binders show moderate performance and mechanical properties compared to thermoset propellants, but these propellants are widely used in a variety of fields due to low cost of raw materials, simple manufacturing process and stable handling process. In order to utilize thermoplastic solid propellants in various fields, we will study properties depending on the content of oxidants, metal fuels and additives.

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Comparative Experimental Study on Structural Behavior of Multi-component Self-Compacting Concrete (다성분계 고유동 콘크리트의 장${\cdot}$단기거동 비교 분석)

  • Noh Jea Myoung;Kwon Ki Joo;Nah Hwan Seon;Joung Won Seoup
    • Proceedings of the Korea Concrete Institute Conference
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    • 2004.11a
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    • pp.735-738
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    • 2004
  • In this study, it was founded to make the optimal mixture for producing concrete which is self-compacting, yet, and generates low heat of hydration by using fly ash, blast furnace slags and limestone powders as binders in addition to cement while using super-plasticizers and viscosity agents as admixture agents. The structural behaviors of the concrete produced with the selected mixture were compared with those of the concrete currently using for construction of nuclear power plants. The study shows that the blended high fluidity concrete including limestone is better in workability and durability than the concrete currently in use for nuclear power plants.

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Practical Experimental Study on Multi-component Self-Compacting Concrete (다성분계 고유동 콘크리트의 현장적용성 연구)

  • Noh Jea Myoung;Kwon Ki Joo;Nah Hwan Seon;Joung Won Seoup
    • Proceedings of the Korea Concrete Institute Conference
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    • 2004.11a
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    • pp.739-742
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    • 2004
  • In this study, it was founded to make the optimal mixture for producing concrete which is self-compacting, yet, and generates low heat of hydration by using flyash, blast furnace slags and limestone powders as binders in addition to cement while using super-plasticizers and viscosity agents as admixture agents. The structural behaviors of the concrete produced with the selected mixture were compared with those of the concrete currently using for construction of nuclear power plants. The study shows that the blended high fluidity concrete including limestone is better in workability and durability than the concrete currently in use for nuclear power plants.

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