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Power-type nickel-zinc ferrite prepared by low-pressure and low-temperature sintering and preparation method thereof

A nickel-zinc ferrite, low-temperature sintering technology, applied in the field of soft ferrite, can solve the problems of long sintering process time and high energy consumption, achieve a flat permeability-temperature curve, uniform grains, and reduce eddy current loss. Effect

Active Publication Date: 2018-12-07
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method has the advantages of adapting to industrial mass production and simple process flow, it also has disadvantages such as high energy consumption in the production process and long sintering process time.

Method used

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  • Power-type nickel-zinc ferrite prepared by low-pressure and low-temperature sintering and preparation method thereof
  • Power-type nickel-zinc ferrite prepared by low-pressure and low-temperature sintering and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Weigh and mix the main components, and the main components are calculated as Fe by mole percentage 2 o 3 9%, NiO21%, ZnO21%, CuO9%, take out and dry after ball milling for 1.5h.

[0021] (2) Carry out pre-firing in an air atmosphere, the pre-firing temperature is 900°C, and the holding time is 2h.

[0022] (3) According to the total mass of the main components, add subcomponents to the calcined material, the subcomponents are CoO0.06wt%, CaCO 3 0.10wt%, BaO0.03wt%, V 2 o 5 0.02wt%, Bi 2 o 3 0.05wt%, SnO 2 0.10wt%, GeO 2 0.03 wt%.

[0023] (4) Secondary ball milling for 4 hours, after drying, add polyvinyl alcohol solution with a mass concentration of 10% as a binder, the addition amount is mainly 10% of the mass of the component, and zinc stearate is added as a release agent, the addition amount is mainly 0.2% of the mass of the ingredients, granulated, and the sieved -40 mesh particles were taken for molding to obtain a blank.

[0024] (5) The blank is si...

Embodiment 2

[0026] (1) Weigh and mix the main components, and the main components are calculated as Fe by mole percentage 2 o 3 51%, NiO20%, ZnO21%, CuO8%, take out and dry after ball milling for 1.5h.

[0027] (2) Carry out pre-firing in an air atmosphere, the pre-firing temperature is 900°C, and the holding time is 2h.

[0028] (3) According to the total mass of the main components, add subcomponents to the calcined material, the subcomponents are CoO0.10wt%, CaCO 3 0.05wt%, V 2 o 5 0.05wt%, SnO 2 0.05wt%, GeO 2 0.05 wt%.

[0029] (4) Secondary ball milling for 4 hours, after drying, add polyvinyl alcohol solution with a mass concentration of 10% as a binder, the addition amount is mainly 10% of the mass of the component, and zinc stearate is added as a release agent, the addition amount is mainly 0.2% of the mass of the ingredients, granulated, and the sieved -40 mesh particles were taken for molding to obtain a blank.

[0030] (5) The blank is sintered, the pressure of the sin...

Embodiment 3

[0032] (1) Weigh and mix the main components, and the main components are calculated as Fe by mole percentage 2 o 3 52%, NiO19.5%, ZnO21.5%, CuO7%, take out and dry after ball milling for 1.5h.

[0033] (2) Carry out pre-firing in an air atmosphere, the pre-firing temperature is 900°C, and the holding time is 2h.

[0034] (3) According to the total mass of the main components, add subcomponents to the calcined material, the subcomponents are CoO0.10wt%, CaCO 3 0.10wt%, V 2 o 5 0.02wt%, Bi 2 o 3 0.10wt%, SnO 2 0.05 wt%.

[0035] (4) Secondary ball milling for 4 hours, after drying, add polyvinyl alcohol solution with a mass concentration of 10% as a binder, the addition amount is mainly 10% of the mass of the component, and zinc stearate is added as a release agent, the addition amount is mainly 0.2% of the mass of the ingredients, granulated, and the sieved -40 mesh particles were taken for molding to obtain a blank.

[0036] (5) The blank is sintered, the pressure of ...

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Abstract

The invention provides power-type nickel-zinc ferrite prepared by low-pressure and low-temperature sintering and a preparation method thereof. The preparation method comprises the following steps thatwhen a blank is sintered, the adopted air pressure is 1-100Pa, the sintering temperature is 750-930 DEG C, the insulation time is 1-8 hours and then a power-type nickel-zinc ferrite material is obtained. The power-type nickel-zinc ferrite is characterized in that the main components and the auxiliary components of the power-type nickel-zinc ferrite are also optimized, and the contents of the maincomponents and the types and the contents of the auxiliary components are limited, wherein the power-type nickel-zinc ferrite material comprises the following main components in percent by mole: 47.5%-55.5% of Fe2O3, 17%-27.5% of NiO, 16%-26% of ZnO and 7%-13% of CuO; the auxiliary components of the power-type nickel-zinc ferrite material are added according to the total mass of the main components, i.e., 4-7 types of the following oxides: 0.02-0.12wt% of Co, 0.05-0.35wt% of CaCO3, 0.02-0.05wt% of BaO, 0.02-0.08wt% of V2O5, 0.05-0.3wt% of Bi2O3, 0.05-0.2wt% of SnO2 and 0.02-0.2wt% of GeO2, and then the power-type nickel-zinc ferrite with higher magnetic conductivity and lower power loss can be obtained.

Description

technical field [0001] The invention belongs to the technical field of soft magnetic ferrite, and in particular relates to a power nickel-zinc ferrite prepared by low-pressure and low-temperature sintering and a preparation method thereof. Background technique [0002] Soft magnetic ferrite is a widely used soft magnetic material. It is mainly made into magnetic cores for the manufacture of various inductors, transformers, filters and choke coils. It is widely used in modern electronic information, communication, transportation and other fields. Among the soft ferrites, nickel-zinc ferrite has the advantages of high application frequency and high resistivity, and has attracted widespread attention. [0003] Since the size of the magnetic core of the transformer is inversely proportional to the square of its operating frequency, the higher the frequency, the smaller the magnetic core, so increasing the operating frequency can greatly reduce the weight and volume of the power ...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622C04B35/626C04B35/64
CPCC04B35/265C04B35/622C04B35/62605C04B35/64C04B2235/6567C04B2235/77
Inventor 严密王小雨白国华金佳莹王新华张雪峰
Owner ZHEJIANG UNIV
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