• 제목/요약/키워드: Valve Materials

검색결과 347건 처리시간 0.039초

염소성분에 의한 터빈 EHC계통 손상에 관한 연구 (A Study on the Trouble of Turbine EHC System by Chloride)

  • 김성민;양천규;윤기남;정재원;신을령
    • 유체기계공업학회:학술대회논문집
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    • 유체기계공업학회 2000년도 유체기계 연구개발 발표회 논문집
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    • pp.366-372
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    • 2000

  • In a power plant, it is generally accepted that a turbine governor system is necessary to control amount of steam supply toward the turbine system. There are many kinds of trouble at this governor system, which is recognized one of the most sensitive systems in the power plant. Especially we have experienced the internal leakage of motorization oil of servo valve. In the study, we investigated the mechanism of an internal leakage such as erosion by foreign materials and corrosion by chemical reaction between chloric healed oil and motorization oil. A precautionary measures is also performed to help the field service engineers.

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[(CoO/NiO)/NiFe/Cu/NiFe] spin-valve 박막에서의 자기저항효과와 자기적 특성에 대한 연구 (The study of magnetoresistance and magnetic properties in [(CoO/NiO)/NiFe/Cu/NiFe] spin-valve thin films)

  • 현준원
    • E2M - 전기 전자와 첨단 소재
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    • 제9권10호
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    • pp.1060-1065
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    • 1996

  • We have studied the magnetoresistance phenomena on spin valve thin films of antiferromagnetic NiO/CoO. Interlayer coupling oscillates between the antiferrocoupling and ferrocoupling with the variation of Cu thickness. The exchange coupling strength between NiO (antiferromagnetic) and NiFe(ferromagnetic) as a function of NiO texture and interface roughness is investigated by CoO insertion. CoO has significantly higher anisotropy in the (111) plane and interface roughness. It seems that the MR-ratio is increased by CoO inserted films. From the AFM and XRD data, the increase of MR-ratio and exchange field is influenced by the roughness of CoO.

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