• Title/Summary/Keyword: NiFe 분말

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분무열분해 공정에 의한 Fe-Ni 계 폐액의 리싸이클링 (Recycling of Fe-Ni Waste Solution by Spray Pyrolysis Process)

  • 유재근
    • 한국산학기술학회:학술대회논문집
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    • 한국산학기술학회 2003년도 춘계학술발표논문집
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    • pp.95-97
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    • 2003
  • 본 연구에서는 새도우마스크 제조공정에서 발생되는 Fe-Ni 계 폐산 용액에 Ni 성분을 용해시킨 복합 산용액을 원료용액으로 사용하여 분무열분해법에 의해 입도분포 및 조성이 균일하며, 입자형태가 구상이면서 평균입도가 100nm 이하인 Ni-ferrite 나노 분말을 제조하며 원료용액의 유입속도, nozzle tip 크기 및 공기압력의 반응조건 변화에 따른 생성분말의 특성 변화를 파악하였다.

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선택적 레이저 용융법으로 제조된 CoCrFeMnNi계 고엔트로피합금의 미세조직 및 기계적 물성 연구 동향 (Microstructure and Mechanical Properties of CoCrFeMnNi-type High-entropy Alloy Fabricated by Selective Laser Melting: A Review)

  • 박정민
    • 한국분말재료학회지
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    • 제29권2호
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    • pp.132-151
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    • 2022
  • The CoCrFeMnNi high-entropy alloy (HEA), which is the most widely known HEA with a single face-centered cubic structure, has attracted significant academic attention over the past decade owing to its outstanding multifunctional performance. Recent studies have suggested that CoCrFeMnNi-type HEAs exhibit excellent printability for selective laser melting (SLM) under a wide range of process conditions. Moreover, it has been suggested that SLM can not only provide great topological freedom of design but also exhibit excellent mechanical properties by overcoming the strength-ductility trade-off via producing a hierarchical heterogeneous microstructure. In this regard, the SLM-processed CoCrFeMnNi HEA has been extensively studied to comprehensively understand the mechanisms of microstructural evolution and resulting changes in mechanical properties. In this review, recent studies on CoCrFeMnNi-type HEAs produced using SLM are discussed with respect to process-induced microstructural evolution and the relationship between hierarchical heterogeneous microstructure and mechanical properties.

Ni-Fe 합금입자 분산 Al2O3 나노복합재료의 미세조직 및 특성 (Microstructure and Properties of Nano-Sized Ni-Fe Alloy Dispersed Al2O3 Composites)

  • 남궁석;정재영;오승탁;이재성;이홍재;정영근
    • 한국분말재료학회지
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    • 제9권3호
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    • pp.161-166
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    • 2002
  • Processing and properties of $Al_2O_3$ composites with Ni-Fe content of 10 and 15 wt% were investigated. Homogeneous powder mixtures of $Al_2O_3$/Ni-Fe alloy were prepared by the solution-chemistry route using $Al_2O_3$, $Ni(NO_3)_2{\cdot}6H_2O$ and $Fe(NO_3)_3{\cdot}9H_2O$ powders. Microstructural observation of composite powder revealed that Ni-Fe alloy particles with a size of 20nm were homogeneously dispersed on $Al_2O_3$ powder surfaces. Hot-pressed composites showed enhanced fracture toughness and magnetic response. The properties are discussed based on the observed microstructural characteristics.