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Ferrite powder sintering process

A ferrite powder and process technology, applied in the field of ferrite powder sintering process, can solve the problems of different magnetic permeability and resistance passing rate of ferrite products, easy cracking of ferrite products, low yield and other problems , to achieve the effect of ensuring consistency and compactness, increased density, and uniform particle size

Inactive Publication Date: 2016-05-25
山东恒瑞磁电股份有限公司
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  • Application Information

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Problems solved by technology

[0003] Due to the different sintering process of the ferrite powder used in the existing ferrite molding blanks after sintering, the finished ferrite products obtained after sintering are easy to crack, the yield is low, and ferrites of different quality are used The magnetic permeability and resistance pass rate of the finished ferrite powder sintered are also different, and the difference is very large

Method used

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Embodiment Construction

[0014] The present invention will be further described below in conjunction with specific embodiment:

[0015] A ferrite powder sintering process, comprising the following steps:

[0016] a. Through the screening of ferrite powder, a powder with uniform particle size and good mobility is prepared to ensure a more uniform distribution of the powder in the membrane cavity and ensure the consistency and compactness of the density of the formed blank;

[0017] b. Keep warm for 2 hours at 250°C in the low temperature section, so that the ferrite blank can be fully degummed, thereby reducing product cracking;

[0018] c. The temperature rises to 600-1100°C, and the temperature rise section 600-1100°C is the gentle growth zone of grains. At this time, there are still pores that are not completely eliminated and hinder the growth of grains; first raise the temperature to 1000°C, then cool down to 750°C and Through nitrogen treatment, the oxygen content is controlled at 0.7-0.9%, so a...

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Abstract

A ferrite powder sintering process comprises the steps of: a, screening ferrite powder to prepare a powder with uniform particle size and good mobility; b, insulating for 2 h at 250 DG C in a low temperature section for fully rubber discharging of a ferrite blank, thus reducing the cracking of a product; c, heating at 600-1100 DEG C, wherein a heating segment of 600-1100 DEG C is a grain gentle growing area; d, rising the temperature to 1400 DEG C, insulating for 2 h, introducing nitrogen, controlling the oxygen content at 8-11%, holding the temperature for 3.5 h, cooling to 1000 DEG C at a speed of 3 DEG C / min, and then cooling to 500 DEG C 5 at speed of 5 DEG C / min; from 500 DEG C, cooling at a speed of 2.5 DEG C / min to below 200 DEG C and discharging. The present invention has the advantage that: according to forming characteristics of ferrite powder, the ferrite powder production process effectively controls the ferrite powder at different reaction temperatures. The produced finished material has increased density, increased yield and improved permeability.

Description

technical field [0001] The invention relates to a ferrite powder sintering process. Background technique [0002] Ferrite is a metal oxide with ferromagnetic properties. In terms of electrical properties, the resistivity of ferrite is much larger than that of metal and alloy magnetic materials, and it also has higher dielectric properties. The magnetic properties of ferrite are also shown to have higher magnetic permeability at high frequencies. Therefore, ferrite has become a widely used non-metallic magnetic material in the field of high frequency and weak current. [0003] Due to the different sintering process of the ferrite powder used in the existing ferrite molding blanks after sintering, the finished ferrite products obtained after sintering are easy to crack, the yield is low, and ferrites of different quality are used The magnetic permeability and resistance pass rate of powder sintered ferrite products are also different, and the difference is very large. Con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/64C04B35/26
CPCC04B35/64C04B35/26C04B2235/656C04B2235/658
Inventor 赵铁钧孙洪霞
Owner 山东恒瑞磁电股份有限公司