• Title, Summary, Keyword: Tape casting

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Doctor Blade Tape Casting of In-based Low Melting Point Alloy (In 계 저융점합금의 닥터 블레이드 테이프캐스팅)

  • Youn, Ki-Byoung
    • Journal of Korea Foundry Society
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    • v.35 no.3
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    • pp.62-66
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    • 2015
  • Tape casting is an important forming operation used to prepare flat sheets in the various industries. In this study, Doctor Blade tape casting of In-based low melting point alloy was carried out. The purpose of this investigation was to determine the possibility of applying the Doctor Blade tape casting process to the manufacture of low melting point alloy sheets that can be used as thermal fusible parts of battery safety systems. In-based molten alloy that has a melting point of $95^{\circ}C$ was produced; it's viscosity was measured at various temperatures. The molten alloy was used as a slip in the caster of the Doctor Blade tape casting system. The effects of the molten alloy temperatures and carrier speeds on the produced sheet shape were observed. For the casting conditions of 1.5 cm slip height, $120^{\circ}C$ slip temperature, 0.05 mm blade gap and 60 m/min. carrier speed, an In-based alloy thin tape well shaped with 0.16 mm uniform thickness was continuously produced.

Development of Magentic Wedges for Inductions Motors via Tape Casting Process (Tape-Casting법을 이용한 고효율 유도 전동기용 자성웨지의 제조기술 개발)

  • Lee, Yong-Ho
    • Proceedings of the KIEE Conference
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    • pp.446-449
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    • 1999
  • 본 연구에서는 기존의 자성 웨지의 제조공정을 대체하여 제조 공정이 단순하고, 그의 정밀성이 우수한 tape casting-lamination법에 의한 자성 웨지의 제조 공정의 적용 가능성에 대한 연구를 수행하였다. 철 분말과 에폭시 slurry는 우수한 tape casting 특성을 보여주었으며, 이렇게 얻어진 green tape과 유리 섬유를 적층하여 자성 웨지를 얻었다. 이러한 과정을 거쳐서 얻어진 제품의 품질 특성을 평가한 결과, 기존의 제조 공정으로 얻어진 제품에 비하여 품질의 균일성이 우수하며, 제조 공정을 혁신적으로 단축하는 것이 가능한 것을 보여주고 있다.

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Tribological Behavior of the Alumina Reinforced with Unidirectionally Oriented SiC whiskers depending on whisker orientation (일방향성 배열을 가진 Sic whisker에 의해 강화된 알루미나 복합체의 Whisker orientation 에 따른 마모마찰 특성)

  • 간태석;한병동;임대순
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • pp.220-224
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    • 1999
  • Sliding wear test was employed to determine the effect of whisker content and orientation on the firiction and wear behavior of SiC whisker reinforced alumina. Composites containing unidirectionally oriented whiskers were prepared by a modified tape casting followed by lamination, binder removal and hot pressing in order to align the whiskers in the tape casting direction. Wear coefficients on three directions were measured; parallel and normal to the tape casting direction on the tape casting surface and normal to lamination direction on surfnce normal to the tape casting direction. In the effect of whisker orientation, the highest wear rate was obtained in the direction parallel tape casting direction and the lowest in the direction normal to lamination direction at all temperatures. Silicon oxide layer amoothing the surface was detected by energy dispersive X-ray analysis on the worn surface.

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Effects of Suspension Composition on Defects in Aqueous Tape Casting of Alumina Ceramics: A Rheological Study

  • Shin, Hyo-Soon
    • Journal of the Korean Ceramic Society
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    • v.42 no.1
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    • pp.1-6
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    • 2005
  • In aqueous alumina tape casting, the effects of altering the composition of the suspensions, the binders and the casting thickness were studied. The rheological behavior of the suspensions and the defects of the dried tapes were examined and the relationships between them are discussed. The changes in the defect regions reported in the previous paper were related with the rheological properties with variations of the binder, the composition and the casting thickness. The shear thinning factor increased with the organic content and the solid content (the decrease of water content). The apparent viscosity increased with the shear thinning factor. The relation between the shear thinning factor and the log apparent viscosity was similar for all binder types. In the relation between the defect free region and the rheological properties, the defect free region became narrower with increasing casting thickness. The defect free region is independent of binder type. Therefore, the thicker tape is more difficult to produce in aqueous alumina tape casting. Knowledge of the rheological properties of the suspensions could help Predict the defect type and the possibility of defect free dried tapes.

Fabrication of Multilayer Ceramic Actuator using Tape Casting Method (Tape casting 법을 이용한 적층형 세라믹 액츄에이터의 제작)

  • Ha, Mun-Su;Lee, Dong-Man;Jeong, Soon-Jong;Kim, In-Sung;Min, Bok-Ki;Song, Jae-Sung
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.556-560
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    • 2002
  • The rheological characteristics of PNN-PZT ceramics with high electromechanical coupling factor and electricstrictive constant was investigated. Green sheets of piezoelectric PNN-PZT ceramics were made by tape-casting method with controlling the mixing ratio of a dispersant, an organic binder, and a plasticizer. When the dispersant content was 1 wt.%, the slurry showed the best rheological characteristics for tape casting. The amounts of the plasticizer and the binder was simultaneously varied in the ranges of 1.5~18 and 3~9 wt.%, respectively. When both the plasticizer and binder of 6 wt.% mixed in the solution, respectiveley, the highest green density of the sheet was obtained without macrodefects. Multilyered structures of PNN-PZT/Ag-Pd were successfully fabricated using the optimized tape casting condition. The polarization behavior of these actuators seemed to similar to typical electricstrictive polarization behavior. The multilayer ceramic actuator is about $0.6{\times}10^{-3}$ of strain.

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Optimization of Rod-shaped γ-LiAlO2 Particle Reinforced MCFC Matrices by Aqueous Tape Casting (수계 테이프 케스팅 법에 의한 봉상 γ-LiAlO2 입자 강화 MCFC 매트릭스 제조 공정의 최적화)

  • Choi, Hyun-Jong;Shin, Mi-Young;Hyun, Sang-Hoon;Lim, Hee-Chun
    • Journal of the Korean Ceramic Society
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    • v.46 no.3
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    • pp.282-287
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    • 2009
  • Rod-shaped particle reinforced $LiAlO_2$ matrices for MCFC were fabricated by an aqueous tape-casting technique. The hydrolysis reaction and agglomeration of $\gamma-LiAlO_2$ particles in aqueous slurries were inhibited by additions of $LiOH{\cdot}H_2O$ and glycerin to the aqueous $\gamma-LiAlO_2$ slurry. The tape-casting, performed using the aqueous slurry containing protein albumin, was fast and led to an effective drying at casting temperature range of $60{\sim}65^{\circ}C$. The strength of the particle reinforced matrix was improved about 4 times compared to that of matrix without reinforcement. Pore size distribution ($0.1{\sim}0.4{\mu}m$) and porosity ($50{\sim}60%$) of the reinforced matrices were determined to be appropriate for the MCFC matrix. The aqueous tape casting process is not only environmental-friendly but also efficient for fabricating MCFC matrices compared to non-aqueous tape casting.

Fabrication and Characteristics of Low Temperature Firing Substrate by Tape Casting in Fluormica System (Tape Casting에 의한 fluormica계 제조 및 특성 저온 소결 기판의 제조 및 특성)

  • 박대현;최정헌;강원호;김병익
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • pp.673-676
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    • 1999
  • We fabricated green sheet by tape casting method with fluormica glass-ceramic powders for fabrication of low temperature co-firing substrate. After ball milling with organic additives, we investigated green strength and density of green sheets which were casted by doctor blade machine. Green sheets were sintered at 700 ~ 1,00$0^{\circ}C$ for 1 ~3hrs. Microstructure, linear shrinkage and dielectric constant of substrates were surveyed.

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Fabrication and Characterization of Alumina Matrix Composites Reinforced with SiC whiskers

  • Han, Byung-Dong;Park, Dong-Soo
    • The Korean Journal of Ceramics
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    • v.5 no.1
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    • pp.12-18
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    • 1999
  • Alumina matrix composites reinforced with up to 20vol% of aligned SiC whiskers were fabricated by tape casting and hot pressing. Alumina composited with randomly distribution SiC whiskers were also fabricated in order to investigate the effect of whisker alignment on properties of the composites. XRD and optical microscopy were used to examine the whisker orientation. The fracture toughness increased with increasing whisker content, and it was higher in the direction normal to the tape casting direction.

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Optimization of Barium Titanate Slip for Tape Casting Using Design of Experiments

  • Kwon, Sung-Wook;Darsono, Nono;Yoon, Dang-Hyok
    • Journal of the Korean Ceramic Society
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    • v.43 no.9
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    • pp.519-526
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    • 2006
  • A full-factorial design of experiments with three input factors and two levels for each factor including center points was utilized for the preparation and characterization of twelve types of $BaTiO_3$ slips for tape casting. Ceramic powders with different particle sizes, different milling methods such as high energy milling and conventional ball milling, and two types of dispersant with different polymeric species were chosen as input factors in order to investigate their effects on slip and on green tape properties. Tape casting, a small rectangular-shaped K-square preparation, characterization and quantitative data analysis using statistical software were followed. Ceramic powder was the most significant among three input factors for the output responses of slip viscosity and green tape density, showing more favorable results with large particles than with very fine ones. In addition, high energy milling for only 30 min was more efficient than 24h of conventional ball milling in terms of powder dispersion and milling. The optimum condition based on the experimental results was a slip exposed to high energy milling with large ceramic particles along with a methylethyl acetate dispersant.

The Effects of Suspension Composition on Defects in Aqueous Tape Casting of Alumina Ceramics

  • Shin, Hyo-Soon
    • Journal of the Korean Ceramic Society
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    • v.41 no.9
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    • pp.647-652
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    • 2004
  • In aqueous tape casting of alumina slurry systems, the relationships between the suspension compositions and the defects of the dried tapes were discussed. The suspensions compositions were controlled with the ratios of the solids, water and organics binder contents. The effects of the thickness of dried tape and kinds of binder system were also examined. In the defect free region, the apparent viscosity showed nearly same value due to the count balancing effect of solid and organic binder content on the apparent viscosity. When water content was constant, increasing solid led to decrease of organic binder content. The defect free region was narrowed with increasing of casting thickness. When linear type acrylic emulsion binders system (D1000 and D 1035) were used, defect free zone formed the belt type in the triangle of solid, water and organic binder content according to the line of constant water contents. However the defect free region was not found in the cross-link type emulsion binder system (D 1050).