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Method for preparing nickel-zinc ferrite by using microwave technology

A nickel-zinc ferrite technology, applied in the field of magnetic material preparation, can solve the problems of uneven grain growth inside the material, difficulty in batch production, and low synthesis rate, so as to save process time and cost and promote application , The effect of high production efficiency

Inactive Publication Date: 2013-04-03
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention provides a method to solve the problems of polluting the environment, difficulty in batch production, low synthesis rate, abnormal and uneven growth of internal crystal grains in the prepared material, and the existence of non-magnetic sintering aids in the existing methods for preparing nickel-zinc ferrite. A kind of method utilizing microwave technology to prepare nickel-zinc ferrite

Method used

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  • Method for preparing nickel-zinc ferrite by using microwave technology
  • Method for preparing nickel-zinc ferrite by using microwave technology
  • Method for preparing nickel-zinc ferrite by using microwave technology

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Use Fe with a particle size of 10-12μm 2 o 3 , Ni with a particle size of 35-38μm 2 o 3 , ZnO with a particle size of 5-8μm as the raw material, according to the chemical formula (Ni 0.5 Zn 0.5 ) Fe 2 o 4 The material is weighed at a molar ratio of Ni:Zn:Fe=0.5:0.5:2. The mass ratios of the three powders in the raw material are ZnO16.73%, Ni 2 o 3 17.15%, Fe 2 o 3 66.12%. The amount of steel balls, oxides and deionized water is mixed according to the ball: material: water = 3:1.5:1, the speed is 150r / min, the ball mill is 3h, and the size of the ball is Ф5mm. The wet mixture after ball milling was kept in a constant temperature drying oven at 120°C for 4h. The dried mixture is lumpy, which is taken out and put into a mortar for grinding, and passed through a 100-mesh sieve. Subsequently, the obtained powder mixture was subjected to microwave synthesis in a multi-cavity microwave oven (2.45GHz, 6kW). The temperature was adjusted by the output power of the equ...

Embodiment 2

[0036] Use Fe with a particle size of 25-27μm 2 o 3 , Ni with a particle size of 20-22μm 2 o 3 , ZnO with a particle size of 15-18μm as the raw material, according to the chemical formula (Ni 0.4 Zn 0.6 ) Fe 2 o 4 The material is weighed at a molar ratio of Ni:Zn:Fe=0.4:0.6:2, and the mass ratios of the three powders in the raw material are ZnO20.10%, Ni 2 o 3 13.73%, Fe 2 o 3 66.17%. The amount of steel balls, oxides and deionized water is mixed according to the ball: material: water = 4:1.5:1, the speed is 120r / min, the ball mill is 5h, and the size of the ball is Ф15mm. The wet mixture after ball milling was kept in a constant temperature drying oven at 150°C for 2h. The dried mixture is lumpy, which is taken out and put into a mortar for grinding, and passed through a 100-mesh sieve. Subsequently, the obtained powder mixture was subjected to microwave synthesis in a multi-cavity microwave oven (2.45GHz, 6kW). The temperature was adjusted by the output power of ...

Embodiment 3

[0038] Use Fe with a particle size of 42-45μm 2 o 3 , Ni with a particle size of 10-12μm 2 o 3 , ZnO with a particle size of 28-30μm as the raw material, according to the chemical formula (Ni 0.6 Zn 0.4 ) Fe 2 o 4 The material is weighed at a molar ratio of Ni:Zn:Fe=0.6:0.4:2. The mass ratios of the three powders in the raw material are ZnO13.38%, Ni 2 o 3 20.56%, Fe 2 o 3 66.06%. The amount of steel balls, oxides and deionized water is mixed according to the ball: material: water = 3:2:1, the speed is 180r / min, the ball mill is 2h, and the size of the ball is Ф20mm. The wet mixture after ball milling was kept in a constant temperature drying oven at 100°C for 6h. The dried mixture is lumpy, which is taken out and put into a mortar for grinding, and passed through a 100-mesh sieve. Subsequently, the obtained powder mixture was subjected to microwave synthesis in a multi-cavity microwave oven (2.45GHz, 6kW). The temperature was adjusted by the output power of the eq...

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Abstract

The invention discloses a method for preparing a nickel-zinc ferrite by using a microwave technology. The method comprises the following steps of: determining a molar ratio of Ni, Zn and Fe in nickel-zinc ferrite components according to a chemical general formula of the nickel-zinc ferrite NixZn1-xFe2O4, wherein x is more than 0 and less than 1; respectively weighing and uniformly mixing oxides of Ni, Zn and Fe according to the proportion, and performing microwave synthesis on the mixture to obtain pre-sintering material powder; grinding the synthesized pre-sintering material powder; adding polyvinyl alcohol into the pre-sintering material powder to compact and mould to obtain a compaction blank; degumming the compaction blank to sinter in a microwave oven to obtain a finished product under a microwave sintering condition that the heating velocity is 10-30 DEG C / min, the sintering temperature is between 1,100-1,300 DEG C and the holding time is between 30 and 180 minutes. The method is simple in process, easy to operate, high in preparation efficiency, low in energy consumption, and environment-friendly, clean and sanitary in preparation process; the time can be greatly saved; the cost is greatly reduced; and the obtained spinel nickel-zinc ferrite is high in purity. The method is suitable for industrial production, has good economic benefit and social benefit, and can promote application of the nickel-zinc ferrite in the industrial and high-end technology.

Description

technical field [0001] The invention relates to a method for preparing nickel-zinc ferrite, in particular to a method for preparing nickel-zinc ferrite by microwave technology, and belongs to the technical field of magnetic material preparation. Background technique [0002] Nickel zinc ferrite with spinel structure is suitable for various inductors, transformers, Filter coils, choke coils, etc. are widely used in communication, sensing, audio-visual equipment switching power supplies, and magnetic head industries. In order to meet the increasingly higher requirements of various devices for soft magnetic materials, "one low, two high and three modernizations" (low loss, high frequency, high magnetic permeability, miniaturization, chip type and thin film integrated surface mount) are The current development direction of soft ferrite products. For this reason, adopting new preparation technology is the basic method to solve the production of high-end soft ferrite, so various...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26
Inventor 彭元东夏庆林李丽娅鲍瑞易健宏
Owner CENT SOUTH UNIV
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