• 제목/요약/키워드: melt spinning

검색결과 179건 처리시간 0.034초

폴리프로필렌/포릴에틸렌 혼합물의 용융방사에 있어서 연신공명에 관한 연구 II - 방사조건에 포릴프로필렌/폴리에틸렌 혼합물의 연신공명에 미치는 영향 - (Studies on the Draw Resonance in the Melt Spinning of Polypropylene/Polyethylene Blends II - Effects of Spinning Conditions on the Draw Resonance of Polypropylene/Polyethylene Blends -)

  • 기영철;김상용
    • 한국섬유공학회:학술대회논문집
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    • 한국섬유공학회 1993년도 제1차 학술발표초록집
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    • pp.78-79
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    • 1993

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폴리프로필렌 용융방사에 있어서 연신공명과 섬유불균제도에 관한 연구 (II) - 방사조건이 연신공명에 의한 섬유 불균제도에 미치는 영향 - (Studies on the Draw Resonance and Filament Irregularity in the Melt Spinning of Polypropylene (II) - Effects of Spinning Conditions on the Filament Irreglarity Caused by Draw Resonance -)

  • 정호규;김상용
    • 한국섬유공학회:학술대회논문집
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    • 한국섬유공학회 1994년도 추계 학술발표회
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    • pp.99-99
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    • 1994

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급속응고한 Al-Be합금의 미세조직 및 인장특성 (Microstructure and Tensile Property of Rapidly Solidified Al-Be alloy)

  • 이인우;박현호;김명호
    • 한국주조공학회지
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    • 제15권5호
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    • pp.459-468
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    • 1995

  • For high performance aerospace structures, the properties of highest priority are low density, high strength, and high stiffness(modulus of elasticity). Addition of beryllium decrease the density of the aluminum alloy and increase the strength and the stiffness of the alloy. However it is very difficult to produce the Al-Be alloy having useful engineering properties by conventional ingot casting, because of the extremely limited solid solubility of beryllium in aluminum. So, rapid solidification processing is necessary to obtain extended solid solubility. In this study, rapidly solidified Al-6 at% Be alloy were prepared by twin roll melt spinning process and single roll melt spinning process. Twin roll melt spun ribbons were extruded at $450^{\circ}C$ with reduction in area of 25 : 1 after vacuum hot pressing at $550^{\circ}C and 375^{\circ}C$. The microstructure of melt spun ribbon exhibited a refined cellular microstructure with dispersed Be particles. As advance velocity of liquid/solid interface increase, the morphology of Be particle vary from rod-like type to spherical type and the crystal structure of Be particle from HCP to BCC. These microstructural characteristics of rapidly solidified Al-6at.%Be alloy were described on the basis of metastable phase diagram proposed by Perepezko and Boettinger. The extruded ribbon consisted of recrystallized grains dispersed with Be particles and exhibited improved tensile property compared with that of extruded ingot.

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