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High-Curie-temperature low-loss high-strength ferrite magnetic block and preparation method thereof

A ferrite magnetic, low-loss technology, applied in the direction of inductance/transformer/magnet manufacturing, permanent magnet, inorganic material magnetism, etc., can solve the problems that the open circuit magnetic core does not have, the expansion of the Curie temperature is biased, etc., to achieve the distribution than reasonable effect

Inactive Publication Date: 2013-05-22
SUZHOU GUANDA MAGNET
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it can be seen from the interpretation of the specification of this patent that it is aimed at closed magnetic cores, that is, it belongs to the category of closed magnetic cores, so it has no reference significance for the preparation of open-circuit magnetic cores applied to the aforementioned vehicle-mounted devices.
[0005] In addition, the technical content of raising the Curie temperature of ferrite in the Chinese and foreign patents and non-patent literatures published so far generally focuses on the exploration of the components of high magnetic permeability materials, that is, by adjusting the ratio of raw materials and dopants to The initial permeability (μi) reaches 5000-12000 to improve the Curie temperature, but it is biased to expand the Curie temperature under the condition of maintaining low loss for power ferrite materials

Method used

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  • High-Curie-temperature low-loss high-strength ferrite magnetic block and preparation method thereof

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Effect test

Embodiment 1

[0026] A) Ingredients, the main raw materials are weighed according to the components of iron oxide 55.4mol%, manganese oxide 38.25mol% and zinc oxide 6.35mol%, respectively, and put them into the mixer for mixing. The speed of the mixer is 40n / min, and the mixing time is 15min, obtain main raw material mixture, iron oxide described in this step is by Fe 2 o 3 Calculated iron oxide, and preferably using Fe with a purity of ≥99.3% produced and sold by Shanghai Baosteel Group Co., Ltd., China 2 o 3 , the manganese oxide is by Mn 3 o 4 Calculated manganese oxide, and preferably use Mn sold under the brand name CR-06 by Hunan Jinrui Technology Co., Ltd., Hunan Province, China 3 o 4 , the purity Mn%≥71%, the zinc oxide is zinc oxide calculated as ZnO, and ZnO produced and sold by Shanghai Jinghua Chemical Factory in China is preferably used, and its weight percentage content ZnO%≥99.7%;

[0027] B) Pre-firing and crushing, introduce the main raw material mixture obtained in s...

Embodiment 2

[0034] Only change the main raw material components in step A) as follows: iron oxide 58.35mol%, manganese oxide 34.85mol% and zinc oxide 6.8mol%, change the speed and mixing time of the mixer to 35n / min and 30min respectively; only Change the pre-burning temperature in step B) to 850°C, the pre-burning time to 70 minutes, the vibration frequency of the vibratory ball mill to 20 times / min, the vibration amplitude to 5 mm, and the average particle diameter of the crushed material to 0.95 -1.05 μm; only change the total weight of auxiliary raw materials relative to the main raw materials in step C) to: Calcium carbonate (CaCO 3 ) 3000ppm, titanium oxide (TiO 2 ) 80ppm, cobalt oxide (Co 2 o 3 ) 1200ppm, ultrafine silicon dioxide (SiO 2 ) 200ppm, chromium oxide (Cr 2 o 3 ) 800ppm, niobium oxide (Nb 2 o 5 ) 100ppm, nickel oxide (NiO) 2000ppm and copper oxide (CuO) 1300ppm, change the weight ratio of water to material to 1.9:1, change the sanding time to 80min, and change the...

Embodiment 3

[0036] Only change the main raw material components in step A) as follows: iron oxide 57mol%, manganese oxide 33mol% and zinc oxide 10mol%, change the speed and mixing time of the mixer to 37n / min and 20min respectively; only step In B), the pre-burning temperature is changed to 880°C, the pre-burning time is changed to 60 minutes, the vibration frequency of the vibration ball mill is changed to 35 times / min, the vibration amplitude is changed to 4mm, and the average particle diameter of the pulverized material is changed to 1-1.2 μm; only change the total weight of the auxiliary raw materials corresponding to the main raw materials in step C) to: calcium carbonate (CaCO 3 ) 1700ppm, titanium oxide (TiO 2 ) 3000ppm, cobalt oxide (Co 2 o 3 ) 50ppm, ultrafine silicon dioxide (SiO 2 ) 25ppm, chromium oxide (Cr 2 o 3 ) 1500ppm, niobium oxide (Nb 2 o 5 ) 1500ppm, nickel oxide (NiO) 600ppm and copper oxide (CuO) 2000ppm, change the weight ratio of water to material to 1.8:1, ...

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Abstract

The invention discloses a high-Curie-temperature low-loss high-strength ferrite magnetic block and a preparation method thereof and belongs to the technical field of Mn-Zn serial ferrite. Main raw materials include ferric oxide, manganese oxide and zinc oxide, auxiliary raw materials include calcium carbonate, titanium oxide, cobalt oxide, silicon oxide, chromium oxide, niobium oxide, nickle oxide and copper oxide, the ferrite magnetic block is composed of the main raw materials, 55-61mol% of ferric oxide calculated according to Fe2O3, 33-40mol% of manganese oxide calculated according to MnO and 5-10% of zinc oxide calculated according to ZnO, and the adding amount of the auxiliary raw materials relative to the total weight of the main raw materials is 500-3000ppm of CaCO3, 80-3000ppm of TiO2, 50-1200ppm of Co2O3, 20-200ppm of superfine SiO2, 100-1500ppm of Cr2O3, 100-1500ppm of Nb2O5, 600-2000ppm of NiO and 600-2000ppm of CuO. The high-Curie-temperature low-loss high-strength ferrite magnetic block has the advantages that initial magnetic permeability can be lowered to be maintained at 1400+ / -25%, power consumption is lower than 550kw / m3 under the condition of 100KHz200mT and at the temperature of 100 DEG C, saturation magnetic flux density at 100 DEG C is larger than 410mT, the Curie temperature is larger than 275 DEG C, and strength of the magnetic block can meet the strength detection standard (F)40N).

Description

technical field [0001] The invention belongs to the technical field of Mn-Zn series ferrite, and in particular relates to a ferrite magnetic block with high Curie temperature, low loss and high strength, and also relates to a preparation method thereof. Background technique [0002] With the rapid development of automotive lighting, automotive DC-DC converters, inverters for LCD and LED displays, inverter air conditioners, solar inverters, etc., the application of power ferrites has been significantly expanded. The power ferrites in these fields are not limited to the exemplified more stringent requirements, which are manifested in: high power conversion efficiency at high temperature (80-160°C); high Curie temperature to adapt to changes in ambient temperature; it is required to have a small power loss coefficient in a high temperature environment, and so on. [0003] In recent years, low-energy solar inverters introduced by European and American countries have been widely...

Claims

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Application Information

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IPC IPC(8): H01F7/02H01F1/36H01F41/02C04B35/64
Inventor 柯宇翔张晓明丁伟青戴加兵
Owner SUZHOU GUANDA MAGNET
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