• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.25 no.7
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• pp.537-542
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• 2012

DSSCs efficiency by thickness of $TiO_2$ photoelectrode and thickness differences between two substrates studied. DSSCs is made of the doctor blade method and photoelectrode annealing temperature elevated in a different ways. In addition, cells efficiencies of according to the different thickness between $TiO_2$ photoelectrode substrate and Pt counter electrode was measured. Efficiency of DSSCs made with $TiO_2$ photoelectrode of 18 ${\mu}m$ thickness and the gap difference between the substrate 28 ${\mu}m$ shows a highest 4.805% efficiency.

• Advanced Composite Materials
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• v.18 no.2
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• pp.167-185
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• 2009

Environmental problems caused by extensive use of polymeric materials arise mainly due to lack of landfill space and depletion of finite natural resources of fossil raw materials like petroleum or natural gas. The substitution of synthetic petroleum-based resins with natural biodegradable resins appears to be one appropriate measure to remedy the above-mentioned situation. This study presents the development of a composite that uses environmentally degradable starch-based resin as matrix and natural mineral basalt fibres as reinforcement, and investigates the fibre's and the composite's mechanical properties. The tensile strength of single basalt fibres was verified by means of single fibre tensile tests and statistically investigated by means of a Weibull analysis. Prepreg sheets were manufactured by means of a modified doctor blade system and hot power press. The sheets were used to manufacture specimens with fibre volume contents ranging from 33% to 61%. Specimens were tested for tensile strength, flexural strength and interlaminar shear strength. Composites manufactured during this study exhibited tensile and flexural strength of up to 517 MPa and 157 MPa, respectively.

• Journal of the Microelectronics and Packaging Society
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• v.5 no.2
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• pp.1-6
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• 1998

B2O3F2를 함유한 Fluormica glass-ceramics 분말과 Potashborosilicate glass 분말을 이용하여 저온소결용 기판을 제조하기 위하여 제조한 그린시트의 특성 및 소결체의 소결 특 성을 평가하였다. 기판 제조용 슬러리를 제조하기 위해 결정화유리분말에 Potashborosilicate glass 분말을 각각 0. 25, 50wt%를 혼용하였다. Doctor blade법으로 그린시트를 제조한후 그 특성을 평가한 결과 건조수축률은 15.2~30.7% 온도상승에 따른 유기물의 탈지온도는 414$^{\circ}C$(2시간)로 선정하였다. 그린시트는 800~120$0^{\circ}C$사이에서 소성하여 소결특성을 평가하였 다. 소결 수축률은 17.5~18.5% 겉보기 기공률은 16.53~20.07%였다.

• Progress in Superconductivity
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• v.1 no.1
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• pp.56-60
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• 1999

Ultra fine MgO particles added BSCCO tapes were fabricated by tape casting using Doctor Blade Method and enclosed by silver foil for different starting compositions (that is, 2223 major, 2212 major). In order to obtain optimum microstructure, thermomechanical treatment was done. Microstructure and phase were analyzed by XRD, SEM and DTA. The critical current density was measured under magnetic field at 77K. The tapes fabricated from the precursor powder with BSCCO-2223 phase (>90%) result in a microstructure with a larger grain size and higher transport critical current density value under magnetic field at given thermomechanical treatment conditions.

• Rapid Communication in Photoscience
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• v.4 no.1
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• pp.16-18
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• 2015

Luminescence properties of anthracene chromophores were investigated. Anthracene chromophores were incorporated in cyclosiloxane-based hybrid polymers through one-pot hydrosilylation reaction. Using four-armed cyclosiloxanes, divinylterminated siloxane monomers, and 9-vinylanthracenes, anthracene-labeled hybrid polymers were prepared. Free-standing hybrid polymer films were prepared successfully by doctor-blade method and thermal treatment. The polymer films exhibit strong blue fluorescence from anthracene and its fluorescence lifetime was not influenced by the temperature, indicating that the movement of anthracene chromophores was restrained in cyclosiloxane-based hybrid polymer films.

• Proceedings of the Materials Research Society of Korea Conference
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• 2000.11a
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• pp.80-80
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• 2000

차세대 대화면 평판 디스플레이에서 가장 주목을 받고 있는 디스플레이 소자는 PDP라고 할 수 있다. PDP 패널 제조 공정 기술에서 난해한 공정 중 하나인 투명 유전체 제조 공정은 현재까지 인쇄법에 의한 연구가 주로 진행되어 왔다. 그러나 인쇄법은 여러 번의 인쇄와 건조, 소성이 반복되어야 함으로써 유전체 제조에 있어서 복잡한 제조 공정이므로 대폭 단순화할 필요가 있다. 이에 대한 해결책으로서 제시된 것이 tape casting을 이용한 건식 공정이다. 본 연구에서는 tape casting용 slurry에 포함되는 유기물인 binder, plasticizer, solvent의 변화에 따른 dry film의 특성 및 소성 조건에 따른 유전체 특성에 관하여 조사하였다. PbO-SiO$_2$-B$_2$O$_3$계 유리 분말과 유기 vehicle을 ball mill을 이용하여 분산, 혼합하여 tape casting용 slurry를 제조하고, 이 slurry를 doctor blade법으로 tape를 제조하고 건조한 후 유리기판에 transfer한 후 소성하였다. Slurry의 조건과 소성 조건에 따른 투광성, 표면 조도 및 단면의 미세구조 등 투명 유전체의 특성을 평가하였다.

• Journal of the Korean Ceramic Society
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• v.30 no.12
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• pp.1066-1070
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• 1993

When looked upon as a polycrystalline, ceramics have two basic differences from a single crystal. One is that there exist grain boundaries, the other is that the crystal axes of each small crystal are arranged in random directions. But the crystal axes fo small crystals which compose ceramics may be made to have the tendency of being arranged in a specific direction. This is called that the crystal axes are oriented. The degree of the direction arrangement of the crystal axes is called orientation. In order to orient the crystal axes effectively, the fiberous barium titanates were made through KDC method and the ion exchange method. And then they were arranged through pressing, doctor blade, and syringe. As the result of Lotgering evaluation, the sample oriented through syringe showed the highest orientation. After sintering, though the most particles that had been fiberous shaped became global shape viewed through SEM, the orientation of the crystals was reinforced by means of sintering.

• Electrical & Electronic Materials
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• v.8 no.6
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• pp.768-773
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• 1995

We describe a manufacturing method and characteristics on components of molten carbonate fuel cell. Cr, Al, AI$_{2}$O$_{3}$, Co, MgO powder were mixed with Ni powder for anode components and NiO was used for cathode electrode. The electrolyte plate consisted of LiAIO$_{2}$ and carbonate (Li$_{2}$CO$_{3}$/K$_{2}$CO$_{3}$=62/38) and these three were manufactured by doctor-blade method. As a result, open circuit voltage was 1.05[VI at Ni-10Cr anode and porosity was above 60[%].

• Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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• 2001.06a
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• pp.313-318
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• 2001

The sliding wear behavior of Plasma-Sprayed Al$_2$O$_3$-TiO$_2$ Coating against Cemented Carbide were Investigated using a pin on disk type tester. The experiment was conducted using Al$_2$O$_3$-TiO$_2$ Coaling as pin material and Cemented Carbide as disk material and different operating conditions, at room temperature under a dry conditions. The results showed that the type B(250kw power) appeared average wear rate Is lowed than type A(80kw power). The specific wear rate of Specimen A1 Increased with normal load. But The specific wear rate of Specimen B1 decreased with normal load. Average wear rate of specimen A3, B3 are lowed than other but the sliding wear mechanism of edge were rough.

• Journal of the Korean Crystal Growth and Crystal Technology
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• v.17 no.2
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• pp.63-68
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• 2007

A number of process problems should be solved in the multi-layered ceramic devices such as EMI filter. In particular, it is essential to control the sintering shrinkage in co-firing of different materials for obtaining defect-free samples such as crack, camber, and delamination which usually occur near the surface and interface. We studied the effect of the powder properties of ferrite on the co-firing behavior of green ceramic layers composed of ferrite and varistor. Three kind of ferrite powder samples as a function of milling time (24, 48, and 72 hr) were prepared. Varistor and ferrite ceramic green sheet were made by means of doctor blade process using slurry (ceramic powder and binder solution). Here, slurry was prepared by mixing 55 wt% powder with 45wt% binder solution. Varistor and ferrite green sheets were laminated at $80 kg/cm^2$, and co-fired at $900^{\circ}C$ and $1000^{\circ}C$ for 3 hr. We obtained the camber-free and co-fired ferrite/varistor layer structure by controlling the milling time and sintering temperature.