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Mn-Zn ferrite fibre and preparing process thereof

A technology of ferrite and fiber, which is applied in the field of Mn-Zn series ferrite ceramic fiber and its preparation, can solve the problem of less ferrite ceramic fiber, achieve low cost, simple process, easy process parameters and microstructure Effect

Inactive Publication Date: 2008-01-16
JIANGSU UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

[0004] At present, the main preparation methods of ceramic fibers include hydrothermal method, physical forming method, gas phase synthesis method and precursor conversion method, etc. There are few reports on the preparation of ferrite ceramic fibers. R.C.Pullar et al. in the UK wrote in the article [The manufacture , characterization and microwave properties of aligned M ferrite fibers. Journal of Magnetism and Magnetic Materials, 1998(186): 326-332; A halidefree route to the manufacture of microstructurally improved M ferrite (BaFe 12 o 19 andSrFe 12 o 19 ) fibres, Journal of the European Ceramic Society, 2002 (22): 2039-2045.] proposed to prepare magnetoplumbite-type BaM and SrM ferrite fibers by hydrochloric acid peptization method, but the prepared fiber diameter is too large, and the composition particles are in Micron

Method used

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  • Mn-Zn ferrite fibre and preparing process thereof
  • Mn-Zn ferrite fibre and preparing process thereof
  • Mn-Zn ferrite fibre and preparing process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1 (spinel type Mn 0.4 Zn 0.6 Fe 2 o 4 ferrite fiber):

[0032] Step 1: get 1.33g manganese nitrate (Mn(NO 3 ) 2 ), 3.31g zinc nitrate (Zn(NO 3 ) 2 ·6H 2 O), 15.00g iron nitrate (Fe(NO 3 ) 3 9H 2 O), 15.61g citric acid (CA:C 6 h 8 o 7 ·H 2 O) mix in 120ml deionized water, Mn 2+ The molar concentration of Zn is 0.08mol / L, Zn 2+ The molar concentration of Fe is 0.08mol / L, Fe 3+ The molar concentration is 0.31mol / L, and the raw material molar ratio is: CA:Fe 3+ : Zn 2+ :Mn 2+ =4:2:0.6:0.4, and then magnetically stirred for 12 hours.

[0033] Step 2: Then put the precursor solution into a rotary evaporator, dehydrate under reduced pressure at 50°C, and the pressure is less than 0.1Mpa, for about 30 minutes, to obtain a gel-like colloidal substance.

[0034] Step 3: Put the gel obtained in step 2 into an oven, dry it at 50°C, and place it in the oven for about 1 hour, then pull the gel into gel cellulose filaments, place the cellulose filaments...

Embodiment 2

[0036] Embodiment 2 (spinel type Mn 0.6 Zn 0.4 Fe 2 0 4 ferrite fiber):

[0037] Step 1: get 2.73g manganese acetate (Mn(CH 3 COO) 2 4H 2 O), 2.21g zinc nitrate (Zn(NO 3 ) 2 ·6H 2 O), 15.00g iron nitrate (Fe(NO 3 ) 3 9H 2 O), 19.51g citric acid (CA:C 6 h 8 o 7 ·H 2 O) mix in 200ml deionized water, Mn 2+ The molar concentration of Zn is 0.06mol / L, Zn 2+ The molar concentration of Fe is 0.04mol / L, Fe 3+ The molar concentration is 0.19mol / L, and the molar ratio of raw materials is: CA:Fe 3+ : Zn 2+ :Mn 2+ =5:2:0.4:0.6, and then magnetically stirred for 20 hours.

[0038] Step 2: Then put the precursor solution into a rotary evaporator, dehydrate under reduced pressure at 60°C, the pressure is less than 0.1Mpa, for about 30 minutes, and obtain a gel-like colloidal substance.

[0039] Step 3: Put the gel obtained in step 2 into an oven, dry it at 60°C, and place it in the oven for about 1 hour, then pull the gel into gel cellulose filaments, place the cellulos...

Embodiment 3

[0041] Embodiment 3 (spinel type Mn 0.8 Zn 0.2 Fe 2 o 4 ferrite fiber):

[0042] Step 1: get 3.64g manganese acetate (Mn(CH 3 COO) 2 4H 2 O), 1.11g zinc nitrate (Zn(NO 3 ) 2 ·6H 2 O), 15.00g iron nitrate (Fe(NO 3 ) 3 9H 2 O), 21.46g citric acid (CA:C 6 h 8 o 7 ·H 2 O) mix in 250ml deionized water, Mn 2+ The molar concentration of Zn is 0.06mol / L, Zn 2+ The molar concentration of Fe is 0.02mol / L, Fe 3+ The molar concentration is 0.15mol / L, and the raw material molar ratio is: CA:Fe 3+ : Zn 2+ :Mn 2+ =5.5:2:0.2:0.8, and then magnetically stirred for 28 hours.

[0043] Step 2: Then put the precursor solution into a rotary evaporator, depressurize at 70°C, the pressure is less than 0.1Mpa, and dehydrate for about 30 minutes to obtain a gel-like colloidal substance.

[0044] Step 3: Put the gel obtained in step 2 into an oven, dry it at 65°C, and place it in the oven for about 1 hour, then pull the gel into gel cellulose filaments, place the cellulose filament...

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Abstract

A Mn-Zn ferrite fiber and the preparation method relate to the inorganic non-metallic materials and the preparation technical field. The present invention uses citric acid and metal salts of magnesium, manganese, zinc and iron as raw materials to get precursor solution through chemical reactions, and then precursor gel is obtained through decompression and dehydration to get the gel cellulose filament through spinning; the gel cellulose filament will then be baked to get spinel-type Mg1-x-yMnxZnyFe2O4 series ferrite ceramic fibers, wherein, x is less than 1 but more than 0, y is less than 1 but more than 0, -xy is less than 1 but more than or equal to 0. Through organic complexation gel precursor conversion, Mn-Zn ferrite ceramic fibers with uniform diameter, smooth surface and larger aspect ratio are obtained at low sintering temperature, therefore, the invention has the advantages of simple process, low equipment requirements, low cost and short operation cycle.

Description

technical field [0001] The invention relates to the field of inorganic non-metallic materials, in particular to a kind of Mn-Zn (Mg 1-x-y mn x Zn y Fe 2 o 4 : 0<x<1, 0<y<1, 1-x-y≥0) series ferrite ceramic fiber and its preparation method. Background technique [0002] The development of spinel Mn-Zn ferrite material originated from World War II. Due to the invention of radar, it is necessary to use soft magnetic materials that can work in the medium and high frequency fields, and Mn-Zn ferrite is a A "double-complex" medium has multiple absorbing mechanisms such as "electrical loss" and "magnetic loss" at high frequencies, so it is widely used as a wave-absorbing material for radar waves. And because Mn-Zn ferrite has the characteristics of "high magnetic permeability, high resistivity, and low loss" at high frequencies, and has the characteristics of easy mass production, stable performance, and especially low cost, it is quickly popularized and applied by ...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/624H01F1/34
Inventor 沈湘黔贾国秀周建新沈绛英
Owner JIANGSU UNIV
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