Atmosphere control method for sintering process of high-frequency wide-temperature low-loss MnZn ferrite

A sintering process and control method technology, applied in the manufacture of inductors/transformers/magnets, electrical components, circuits, etc., can solve problems such as product cracking, multi-grain, heat preservation, etc., and achieve product cracking prevention, low power loss, and high efficiency. The effect of frequency magnetic properties

Active Publication Date: 2018-01-09
ZHEJIANG UNIV +1
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Problems solved by technology

In addition, many patents related to the preparation technology of MnZn ferrite mention the sintering temperature and atmosphere control methods of the products involved, but they are not kept warm under a suitable atmosphere, and more grains are likely to be produced during the preparation process Defects, even lead to cracking of the product during sintering, so it is necessary to provide a relatively accurate control of the sintering temperature and atmosphere to achieve the preparation of high-bandwidth, stable and low-loss MnZn ferrite

Method used

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  • Atmosphere control method for sintering process of high-frequency wide-temperature low-loss MnZn ferrite

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Embodiment example 1

[0039] The content of the selected main components is calculated as oxides: Fe 2 o 3 : 71.2wt%, ZnO: 5.82wt%, MnO: the balance, the main component was ball milled for 1 hour, and the powder obtained from the first ball mill was heated to 930°C at a rate of 200-300°C / h in an air atmosphere , keep warm for 2 hours, and get a sintered powder with furnace cooling; add an appropriate amount of In to the black powder obtained by pre-sintering 2 o 3 , CoO, CaO, TiO 2 , SiO 2and other additives, and add an appropriate amount of deionized water, mill the second time for 4 hours to obtain powder particles with a particle size of 0.7-2 μm, and the particle size distribution obeys the normal distribution; dry the particles after the second ball milling, grind and disperse, add Polyvinyl alcohol is granulated, and sieved to obtain manganese-zinc-ferrite powder; the powder obtained by granulation is pressed into shape, and the green density should reach 2.6-3.6gcm -3 Put it into an atm...

Embodiment example 2

[0042] The content of the selected main components is calculated as oxides: Fe 2 o 3 : 71.64wt%, ZnO: 5.46wt%, MnO: the balance, the main component was ball milled for 1 hour, and the powder obtained by the first ball mill was heated to 930°C at a rate of 200-300°C / h in an air atmosphere , keep warm for 2 hours, and get a sintered powder with furnace cooling; add an appropriate amount of In to the black powder obtained by pre-sintering 2 o 3 , CoO, CaO, TiO 2 , SiO 2 and other additives, and add an appropriate amount of deionized water, mill the second time for 4 hours to obtain powder particles with a particle size of 0.7-2 μm, and the particle size distribution obeys the normal distribution; dry the particles after the second ball milling, grind and disperse, add Polyvinyl alcohol is granulated, and sieved to obtain manganese-zinc-ferrite powder; the powder obtained by granulation is pressed into shape, and the green density should reach 2.6-3.6g cm -3 Put it into an at...

Embodiment example 3

[0045] The content of the selected main components is calculated as oxides: Fe 2 o 3 : 71.07wt%, ZnO: 5.10wt%, MnO: the balance, the main component was ball milled for 1 hour, and the powder obtained from the first ball mill was heated to 930°C at a rate of 200-300°C / h in an air atmosphere , keep warm for 2 hours, and get a sintered powder with furnace cooling; add an appropriate amount of In to the black powder obtained by pre-sintering 2 o 3 , CoO, CaO, TiO 2 , SiO 2 and other additives, and add an appropriate amount of deionized water, mill the second time for 4 hours to obtain powder particles with a particle size of 0.7-2 μm, and the particle size distribution obeys the normal distribution; dry the particles after the second ball milling, grind and disperse, add Polyvinyl alcohol is granulated, and sieved to obtain manganese-zinc-ferrite powder; the powder obtained by granulation is pressed into shape, and the green density should reach 2.6-3.6g cm -3 Put it into an ...

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Abstract

The invention provides a sintering atmosphere control method in preparation of high-frequency wide-temperature low-loss MnZn ferrite. The method comprises the following steps: carrying out primary heating and heat preservation, carrying out secondary heating and heat preservation, cooling, carrying out heat preservation, and finally cooling. According to the method, corresponding oxygen partial pressure is adjusted at different temperatures and in different temperature changing processes, zinc loss in a sintering process can be reduced, and element valence change and impure phase precipitationat high temperature are inhibited, so that the soft magnetic property of the material is improved; and by adding reasonable heat preservation time, sintering internal stress can be effectively reduced, and the material is prevented from cracking in the sintering process. The method provided by the invention is applicable to preparation of multiple MnZn ferrites, and the wide-temperature low-lossMnZn power ferrite used at the frequency of 0.1-5MHz can be obtained; reasonable technological parameters can improve yield in preparation process, and a product with uniform and stable performance can be beneficially obtained; and the method is simple and practicable and has practical value.

Description

technical field [0001] The invention relates to a method for controlling the atmosphere in the sintering process of MnZn ferrite with high frequency, wide temperature and low loss, and belongs to the technical field of magnetic materials. Background technique [0002] As an important component material, soft ferrite is mainly made into magnetic cores for the manufacture of various inductors, transformers, filters and choke coils, and is widely used in modern power and electronic information fields, such as computers and Peripheral equipment, office automation equipment, digital communication and analog communication equipment, Internet, household appliances, electromagnetic compatibility equipment, green lighting, industrial automation and automotive, aviation, aerospace and military fields. Compared with other soft magnetic materials, the advantage of soft magnetic ferrite is that the resistivity is relatively high, which suppresses the generation of eddy current, so that f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/38C04B35/622C04B35/64H01F1/34H01F41/02
Inventor 严密金佳莹霍骅鑫白国华包大新杜阳忠魏中华
Owner ZHEJIANG UNIV
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