KR950000617A - Manufacturing method of high coercivity Sr-ferrite magnetic body - Google Patents

Manufacturing method of high coercivity Sr-ferrite magnetic body Download PDF

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Publication number
KR950000617A
KR950000617A KR1019930010392A KR930010392A KR950000617A KR 950000617 A KR950000617 A KR 950000617A KR 1019930010392 A KR1019930010392 A KR 1019930010392A KR 930010392 A KR930010392 A KR 930010392A KR 950000617 A KR950000617 A KR 950000617A
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South Korea
Prior art keywords
ferrite magnetic
present
firing
thermal shock
basic substance
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KR1019930010392A
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Korean (ko)
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KR960004390B1 (en
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최진호
한양수
송승완
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최진호
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    • 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
    • C04B35/64—Burning or sintering processes
    • 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
    • C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
    • C04B35/26—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on ferrites
    • C04B35/2683—Other ferrites containing alkaline earth metals or lead
    • 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
    • H01F1/34—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 non-metallic substances, e.g. ferrites
    • H01F1/342—Oxides
    • H01F1/344—Ferrites, e.g. having a cubic spinel structure (X2+O)(Y23+O3), e.g. magnetite Fe3O4
    • 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
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
    • C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
    • C04B2235/54—Particle size related information
    • C04B2235/5418—Particle size related information expressed by the size of the particles or aggregates thereof
    • C04B2235/5454—Particle size related information expressed by the size of the particles or aggregates thereof nanometer sized, i.e. below 100 nm
    • 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
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
    • C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
    • C04B2235/6567—Treatment time

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Power Engineering (AREA)
  • Inorganic Chemistry (AREA)
  • Compounds Of Iron (AREA)
  • Hard Magnetic Materials (AREA)

Abstract

본 발명은 수직 자기 기록 매체로 유용한 Sr-페라이트 자성체 분말의 개량된 제조 방법을 제공한다. 본 발명의 방법은 (a) Sr(NO3)2, Fe(NO3)3·9H2O, 시트르산(C6H8O7) 및 염기성 물질의 혼합 수용액으로부터 비결정 겔 타입의 전극 물질을 얻는 단계와, (b) 위 (a) 단계에서 얻어진 전구 물질을 고온에서 열충격을 가하며 소성하는 단계로 이루어진다. 본 발명에 따라 얻어진 Sr-페라이트 자성체 분말은 0.02∼0.05㎛의 초미세 입자 크기와 6,000∼6,700 Oe의 높은 보자력을 갖는다.The present invention provides an improved method for producing Sr-ferrite magnetic powder useful as a vertical magnetic recording medium. The method of the present invention (a) obtains an amorphous gel type electrode material from a mixed aqueous solution of Sr (NO 3 ) 2 , Fe (NO 3 ) 3 .9H 2 O, citric acid (C 6 H 8 O 7 ) and a basic substance. And (b) firing the precursor obtained in the above step (a) with thermal shock at high temperature. The Sr-ferrite magnetic powder obtained according to the present invention has an ultrafine particle size of 0.02 to 0.05 μm and a high coercive force of 6,000 to 6,700 Oe.

Description

고보자력 Sr-페라이트 자성체의 제조 방법Method for producing high coercivity Sr-ferrite magnetic body

본 내용은 요부공개 건이므로 전문내용을 수록하지 않았음Since this is an open matter, no full text was included.

제2도는 시트레이트 졸-겔 과정을 통해 얻은 전구 물질을 사전 열처리 없이 850℃의 고온에서 열충격을 가하고 동일 온도에서 2시간 동안 소성하여 제조한 본FIG. 2 is a pattern prepared by applying a thermal shock at a high temperature of 850 ° C. and calcining at the same temperature for 2 hours without preheating the precursor obtained through the citrate sol-gel process.

Claims (6)

(a) Sr(NO3)2, Fe(NO3)3ㆍ9H2O, 시트르산(C6H8O7) 및 염기성 물질의 혼합 수용액으로부터 비결정겔 타입의 전구 물질을 얻는단계와, (b) 위 (a) 단계에서 얻어진 전구 물질을 고온에서 열충격을 가하며 소성하는 단계로 이루어진 것을 특징으로 하는, 고보자력의 Sr-페라이트 자성체 미세 분말의 제조 방법.(a) obtaining an amorphous gel type precursor from a mixed aqueous solution of Sr (NO 3) 2, Fe (NO 3) 3 .9H 2 O, citric acid (C 6 H 8 O 7) and a basic substance, and (b) the precursor obtained in step (a) above. Method for producing a high coercivity Sr-ferrite magnetic fine powder, characterized in that the material consists of a step of firing at high temperature with a thermal shock. 제1항에 있어서, 상기 (b) 단계에서 열충격 온도가 800∼900℃인 것이 특징인 방법.The method of claim 1, wherein the thermal shock temperature in the step (b) is 800 ~ 900 ℃. 제1항에 있어서, 상기 (b) 단계에서의 소성이 800∼900℃에서 1∼3시간 동안 수행되는 것이 특징인 방법.The method according to claim 1, wherein the firing in step (b) is performed at 800 to 900 ° C for 1 to 3 hours. 제1항에 있어서, Sr-페라이트 자성체 분말의 입자 크기가 0.02∼0.05㎛이고, 보자력이 6,000∼6,700Oe인 방법.The method of claim 1, wherein the Sr-ferrite magnetic powder has a particle size of 0.02 to 0.05 µm and a coercive force of 6,000 to 6,700 Oe. 제1항에 있어서, 염기성 물질이 암모니아수인 방법.The method of claim 1 wherein the basic substance is ammonia water. 제1항에 있어서, Sr(NO3)2 : Fe(NO3)3ㆍ9H2O의 몰비가 1:10∼12인 방법.The method according to claim 1, wherein the molar ratio of Sr (NO 3) 2: Fe (NO 3) 3 .9H 2 O is 1: 10-12. ※ 참고사항 : 최초출원 내용에 의하여 공개하는 것임.※ Note: The disclosure is based on the initial application.
KR1019930010392A 1993-06-09 1993-06-09 Process for the preparation of sr-ferrite KR960004390B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1019930010392A KR960004390B1 (en) 1993-06-09 1993-06-09 Process for the preparation of sr-ferrite

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1019930010392A KR960004390B1 (en) 1993-06-09 1993-06-09 Process for the preparation of sr-ferrite

Publications (2)

Publication Number Publication Date
KR950000617A true KR950000617A (en) 1995-01-03
KR960004390B1 KR960004390B1 (en) 1996-04-02

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KR1019930010392A KR960004390B1 (en) 1993-06-09 1993-06-09 Process for the preparation of sr-ferrite

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