KR20140100347A - 기상 공정에 의해 합성된 금속세라믹 코어쉘 구조의 자성체 분말 및 이의 제조방법 - Google Patents
기상 공정에 의해 합성된 금속세라믹 코어쉘 구조의 자성체 분말 및 이의 제조방법 Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
- H01F41/0246—Manufacturing of magnetic circuits by moulding or by pressing powder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/02—Compacting only
- B22F3/04—Compacting only by applying fluid pressure, e.g. by cold isostatic pressing [CIP]
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/026—Spray drying of solutions or suspensions
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
- H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
- H01F1/20—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder
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- Engineering & Computer Science (AREA)
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- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
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Abstract
본 발명에서는 기존 금속-세라믹 코어-쉘 구조의 자성체 분말을 합성하는 복잡한 액상 공정을 기상 공정으로 대체할 수 있을 뿐만 아니라, 종래 환원 분위기를 유지할 수 없는 화염분무열분해 공정을 적용함에도 불구하고 다양한 조성을 갖는 금속-세라믹 코어-쉘 구조의 신규 소재를 합성할 수 있다. 따라서 열저장소재, 태양열소재, 자동차부품, 전자 재료 등의 여러 응용 분야에 유용하게 적용될 수 있다.
Description
도 2는 실시예 1에 따라 화염분무열분해 공정에 의해 합성된 코어-쉘 구조의 Co3O4-SiO2 세라믹 분말의 투과전자현미경(TEM) 사진이다.
도 3은 실시예 1에서 합성된 Co3O4-SiO2 코어-쉘 구조의 세라믹 분말을 환원시켜 얻어진 Co-SiO2 코어-쉘 구조의 자성체 분말의 투과전자현미경(TEM) 사진이다.
도 4는 실시예 1에서 합성된 Co3O4-SiO2 코어-쉘 구조의 세라믹 분말을 환원시켜 얻어진 Co-SiO2 코어-쉘 구조의 자성체 분말의 X선회절분석(XRD) 결과를 나타내는 도면이다.
도 5는 실시예 1에서 합성된 Co3O4-SiO2 코어-쉘 구조의 세라믹 분말을 환원시켜 얻어진 Co-SiO2 코어-쉘 구조의 자성체 분말의 자기이력곡선 그래프이다.
도 6은 실시예 2에서 합성된 Ni-SiO2 코어-쉘 구조의 복합체 분말의 투과전자 현미경(TEM) 사진이다.
도 7은 실시예 3에서 합성된 Ni-TiO2 코어-쉘 구조의 복합체 분말의 투과전자 현미경 사진이다.
도 8은 실시예 4에서 화염분무열분해 공정에 의해 합성된 CuO-TiO2 분말을 환원시켜 얻어진 Cu-TiO2 분말의 전자현미경(SEM) 사진이다.
도 9는 실시예 5에서 합성된 NiCo-SiO2 코어-쉘 구조의 복합체의 투과전자현미경(TEM) 사진이다.
도 10은 실시예 6에서 합성된 CoFe-SiO2 코어-쉘 구조의 복합체의 투과전자현미경(TEM) 사진이다.
도 11은 비교예 1의 화염분무열분해 공정에 의해 합성된 Fe2O3 분말을 환원시켜 얻어진 Fe 분말의 전자현미경(SEM) 사진이다.
Claims (15)
- 제1세라믹 코어; 및 상기 제1세라믹 코어 보다 금속 환원성이 낮은 제2세라믹 쉘을 포함하는 세라믹 코어-쉘 분말을 환원 분위기하에서 열처리하여,
상기 제1세라믹 코어를 금속 코어로 환원하는 단계를 포함하는 것을 특징으로 하는 금속-세라믹 코어-쉘 구조의 자성체 분말의 제조방법. - 제1항에 있어서, 상기 세라믹 코어-쉘 분말은 기상공정에 의해 형성된 것을 특징으로 하는 자성체 분말의 제조방법.
- 제1항에 있어서, 상기 제조방법은
(a) 쉘 물질의 전구체, 상기 쉘 물질 보다 금속 환원성이 높은 코어 물질의 전구체, 및 용매를 혼합하여 분무 용액을 제조하는 단계;
(b) 상기 분무용액을 분무장치에 투입하여 코어 물질, 쉘 물질 또는 이들 모두가 함유된 액적을 발생시키는 단계;
(c) 상기 발생된 액적들이 화염을 통과하여 제1세라믹-제2세라믹 코어-쉘 구조의 세라믹 분말을 형성하는 단계; 및
(d) 형성된 세라믹 분말을 환원 분위기하에서 열처리하여 제1세라믹 코어를 금속 코어로 환원하는 단계
를 포함하는 자성체 분말의 제조방법. - 제3항에 있어서, 상기 코어 물질과 쉘 물질의 전구체는 초산염(acetate), 질산염(nitrate), 염화물(chloride), 수화물(hydroxide), 탄산염(carbonate) 및 산화물(oxide)로 이루어진 군으로부터 선택된 1종 이상인 것을 특징으로 하는 자성체 분말의 제조방법.
- 제3항에 있어서, 상기 코어 물질의 전구체는 Ni, Cu, Fe, Co, 및 Sn로 구성된 군으로부터 선택된 1종 이상의 전이금속을 포함하며,
상기 쉘 물질의 전구체는 Ba, Ti, Si, Ar, Al, Ce 및 Mg로 구성된 군으로부터 선택된 1종 이상을 포함하는 것을 특징으로 하는 자성체 분말의 제조방법. - 제3항에 있어서, 상기 단계 (a)에서 분무용액의 농도는 코어 물질의 전구체와 쉘 물질의 전구체를 포화 용해도 이하로 포함하는 것을 특징으로 하는 자성체 복합체 분말의 제조방법.
- 제3항에 있어서, 상기 단계 (b)의 분무장치는 초음파 분무장치,일류체 공기노즐 분무장치, 이류체 공기노즐 분무장치,초음파 노즐 분무장치,필터 팽창 액적 발생장치(FEAG), 및 디스크 타입 액적 발생장치로 구성된 군에서 선택되는 것을 특징으로 하는 자성체 분말의 제조방법.
- 제3항에 있어서, 상기 단계 (b)에서 발생된 액적은 평균 직경이 0.1 내지 300㎛ 범위인 것을 특징으로 하는 자성체 분말의 제조방법.
- 제3항에 있어서, 상기 단계 (c)의 화염 온도는 2000℃ 내지 9000℃ 범위인 것을 특징으로 하는 자성체 분말의 제조방법.
- 제3항에 있어서, 상기 단계 (d)에서 열처리 온도는 300 내지 600℃ 범위인 것을 특징으로 하는 자성체 분말의 제조방법.
- 제1항 내지 제10항 중 어느 한 항의 방법에 의해 제조되는 금속-세라믹 코어-쉘 구조의 자성체 분말.
- 제11항에 있어서, 상기 금속 코어와 세라믹 쉘의 중량비는 0.5-99.5 : 99.5-0.5 중량% 범위인 것을 특징으로 하는 자성체 분말.
- 제11항에 있어서, 상기 금속 코어는 Co, Cu, Fe, NiFe, CuFe, CoFe, NiCo, CuCo, Sn, SnFe, SnNi, 및 SnCo로 구성된 군으로부터 선택되고,
상기 세라믹 쉘은 TiO2, BaTiO3, SiO2, ZrO2, Al2O3, CeO2 및 MgO로 구성된 군에서 선택되는 것을 특징으로 하는 자성체 분말. - 제11항에 있어서, 상기 분말은 평균 직경이 5nm 내지 100 nm 범위인 구형의 나노입자 형태인 것을 특징으로 하는 자성체 분말.
- 제11항에 따른 자성체 분말을 포함하며, 인덕터, 마그네틱 센서, 또는 의료기기인 것을 특징으로 하는 제품.
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