• 제목/요약/키워드: polytetrafluoroethylene

검색결과 249건 처리시간 0.065초

플라스틱재료의 왕복동 마찰마멸거동 (Behavior of Reciprocating Dry Sliding Wear of Plastics Against Steel)

  • 김충현;안효석;정태형
    • Tribology and Lubricants
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    • 제16권1호
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    • pp.1-8
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    • 2000

  • Friction and wear tests have been performed on nylon, acetal resin, and PTFE (polytetrafluoroethylene), in reciprocating dry sliding conditions against steel discs. According to the results, acetal resin showed the lowest wear rates and PTFE exhibited the lowest friction coefficient. The prominent wear mechanisms found were adhesion and abrasion.

  • https://doi.org/10.9725/kstle.2000.16.1.001 인용 PDF

알코올계 촉매 슬러리를 활용한 바 코팅으로 제조된 PTFE 전극의 형성 및 특성 조사 (Characterization of PTFE Electrode Made by Bar-Coating Method Using Alcohol-Based Catalyst Slurry)

  • 정현승;김도형;박찬호
    • 한국수소및신에너지학회논문집
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    • 제31권3호
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    • pp.276-283
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    • 2020

  • Alcohol-based solvents including ethanol (EtOH) and tert-butyl alcohol (TBA) are investigated instead of isopropanol (IPA), which is a common solvent for polytetrafluoroethylene (PTFE), as an alternative solvent for preparing the catalyst slurry with PTFE binder. As a result, the performance at 0.2 A/㎠ from the single cells from using catalyst slurries based on EtOH and TBA showed very similar value to that from the slurry using IPA, which implies the EtOH and TBA can be used as a solvent for the catalyst slurry. It is also confirmed by the very close values of the total resistance of the membrane electrode assemblies from the slurries using different solvents. In the energy dispersive spectrometry (EDS) image, the shape of crack and dispersion of PTFE are changed according to the vapor pressure of the solvent.

  • https://doi.org/10.7316/KHNES.2020.31.3.276 인용 PDF KSCI

중년 여자 환자에서 Takayasu 동맥염에 의한 복부 대동맥의 삭양 폐쇄 - 수술치험 1례- (Cord-like Atresia of the Abdominal Aorta Due to Takayasu Arteritis in Middle Aged Woman - A case Report -)

  • 이봉근;조성래;조봉균;이재화;조영덕
    • Journal of Chest Surgery
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    • 제34권11호
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    • pp.870-874
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    • 2001

  • Takayasu 동맥염은 만성 비특이성 동맥염으로 젊은 여자에 호발하며 대동맥궁의 분지 혈관이나 신동맥 등 여러 혈관들을 광범위하게 침범하여 폐쇄를 일으키는 질환으로 알려져 있다. 최근 나이가 많은 52세의 여자 환자에서 신동맥 이하의 복부 대동맥에만 국한적으로 침범하여 삭did(cord-like) 폐쇄를 일으킨 Takayasu 동맥염의 비교적 드문 예를 경험하고 18mm PTFE(polytetrafluoroethylene) 인조혈관을 이용하여 하행 흉부 대동맥과 총장골동맥 분기 직상부 복부 대동맥 사이에 측단 우회술을 시행하여 좋은 결과를 얻었기에 보고한다.

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