• 제목/요약/키워드: Ceramic deposition

검색결과 735건 처리시간 0.044초

페놀수지 탄화 코팅법을 이용한 섬유강화 복합재료 계면 형성에 관한 연구 (Novel Phenol Resin Carbonizing Method for Carbon Interlayer Coating between Reinforcing Fiber and Matrix in Fiber Reinforced Ceramic Composite)

  • 김세영;우상국;한인섭
    • 한국세라믹학회지
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    • 제46권3호
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    • pp.301-305
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    • 2009
  • The novel carbon coating process for interlayer of fiber reinforced ceramic composites between fiber and matrix was performed by carbonizing phenolic resin solution that coated on fiber surface in $N_2$ atmosphere at $600^{\circ}C$ to improve the strength and fracture toughness of CMC(ceramic matrix composite). 160 nm carbon layer was coated on fiber surface with 5 vol% of phenolic resin solution. Since the process temperature ($600^{\circ}C$) is lower than chemical vapor deposition($900{\sim}1000^{\circ}C$), the strength and toughness could be preserved. Furthermore the coating thickness uniformity was improved to 8% of deviation along the stacking sequence. Therefore, prevention from fiber degradation during coating process and controlling coating thickness uniformity along the preform depth were achieved by coating with phenolic resin carbonizing method.

UMG 실리콘 태양전지의 패시베이션 공정 연구 (Optimization of Passivation Process in Upgraded Metallurgical Grade (UMG)-Silicon Solar Cells)

  • 장효식;김유진;김진호;황광택;최균;안종형
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2009년도 하계학술대회 논문집
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    • pp.438-438
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    • 2009
  • We have investigated the effect of forming gas annealing for Upgraded Metallurgical Grade (UMG)-silicon solar cell in order to obtain low-cost high-efficiency cell using post deposition anneal at a relatively low temperature. We have observed that high concentration hydrogenation effectively passivated the defects and improved the minority carrier lifetime, series resistance and conversion efficiency. It can be attributed to significantly improved hydrogen-passivation in high concentration hydrogen process. This improvement can be explained by the enhanced passivation of silicon solar cell with antireflection layer due to hydrogen re-incorporation. The results of this experiment represent a promising guideline for improving the high-efficiency solar cells by introducing an easy and low cost process of post hydrogenation in optimized condition.

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알루미늄의 진공증발과 열산화에 의한 알루미나 복합분리막의 제조 및 특성분석 (Synthesis and Characterization of Alumina Composite Membrane by Al Evaporation and Thermal Oxidation)

  • 이동호;최두진;현상훈
    • 한국세라믹학회지
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    • 제32권3호
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    • pp.349-358
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    • 1995
  • The ceramic composite membrane was synthesized by thermal oxidation after evaporation of Al on the support prepared by slip casting process. Oxidation was performed at $700^{\circ}C$ and 80$0^{\circ}C$ under dry oxygen atmosphere. It was considered as optimum oxidation condition that the membrane showed a knudsen behaviro. A further oxidation resulted in an increase of gas permeability because top layer became densified. Then, a multi-layered composite membrane was synthesized through a sol-gel method, evaporation and thermal oxidation of Al coating processes. While the membrane was thermally stable up to 80$0^{\circ}C$, gas permeability was rapidly decreased even at a slight amount of deposition of Al.

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Effect of Active Ceramic Resources in Cutaneous Wound Healing and Expression of its Related Cytokines

  • Chung, Jae-yong;Jeong, Kyu-shik
    • 한국수의병리학회:학술대회논문집
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    • 한국수의병리학회 2003년도 추계학술대회초록집
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    • pp.15-15
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    • 2003
  • Cutaneous wound healing is a highly orchestrated process comprising a number of well-defined temporally overlapping phase. These include the migration of inflammatory cells to the wound site, and re-establishment of an epithelial barrier (re-epithelization), and the deposition of matrix by fibroblast [1]. We attempt to find out that active ceramic resources has effects on cutaneous wound healing. And furthermore, we investigate its related mechanism and expression of cytokines of cutaneous wound healing which is accelerated by active ceramic resources. (omitted)

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