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High saturation magnetic flux density low loss soft magnetic ferrite material and producing method thereof

A soft ferrite and magnetic flux density technology, applied in the direction of inorganic material magnetism, etc., can solve the problems of high saturation magnetic flux density, low cost and large loss, and achieve high saturation magnetic flux density, low cost and low loss. Effect

Active Publication Date: 2009-07-15
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The present invention mainly aims at the problems of low saturation magnetic flux density and large loss in the prior art, and provides a high saturation magnetic flux density at high temperature, low loss, low cost, and adaptable to existing large-scale production by improving the composition. High saturation magnetic flux density and low loss soft ferrite material and preparation method thereof

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  • High saturation magnetic flux density low loss soft magnetic ferrite material and producing method thereof

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Embodiment 1

[0033] with Fe 2 o 3 54.6mol%, MnO 43.4mol%, ZnO 2mol% weigh Fe as the main formula content 2 o 3 , MnO, and ZnO raw materials were wet-mixed, and then pre-fired at 900°C for 2 hours. According to the weight of the main formula, to the pre-fired mixture relative to Fe 2 o 3 The total amount of , MnO, ZnO is calculated by adding 150ppm of SiO in weight percentage 2 , 900ppm of CaCO 3 , 200ppm ZrO 2 , 200ppm Nb 2 o 5 and 100ppm Na 2 O, where Na 2 O with NaCl or Na 2 CO 3 The form of adding, wet sanding, ferrite slurry. Add 1wt% PVA binder calculated by ferrite powder weight to the slurry for spray granulation. Under a certain pressure, the granulated powder is molded into a standard ring ferrite core for testing. The molded body was sintered at 1250° C. for 0.5 hour under the condition of oxygen partial pressure concentration of 0.1%, wherein the heating rate was 4° C. / min during the heating stage of 1000° C. to 1250° C., and the oxygen partial pressure concentra...

Embodiment 2

[0036] with Fe 2 o 3 54.5mol%, MnO 42.5mol%, ZnO 3mol% weigh Fe as the main formula content 2 o 3, MnO, and ZnO raw materials were wet-mixed, and then pre-fired at 900°C for 2 hours. According to the weight of the main formula, add 150ppm of SiO to the pre-fired mixture in terms of weight percentage relative to the total amount of Fe2O3, MnO, and ZnO 2 , 900ppm of CaCO 3 , 200ppm ZrO 2 , 200ppm Nb 2 o 5 and 100ppm Na 2 O, where Na 2 O with NaCl or Na 2 CO 3 The form of adding, wet sanding, ferrite slurry. Add 1wt% PVA binder calculated by ferrite powder weight to the slurry for spray granulation. Under a certain pressure, the granulated powder is molded into a standard ring ferrite core for testing. The molded body was sintered at 1250° C. for 1 hour under the condition of oxygen partial pressure concentration of 0.01%, wherein the heating rate was 4° C. / min in the heating stage of 1000° C. to 1250° C., and the oxygen partial pressure concentration was 1%. Cooli...

Embodiment 3

[0039] with Fe 2 o 3 54.3mol%, MnO 41.7mol%, ZnO 4mol% weigh Fe as the main formula content 2 o 3 , MnO, and ZnO raw materials were wet-mixed, and then pre-fired at 900°C for 2 hours. According to the weight of the main formula, add 150ppm of SiO to the pre-fired mixture in terms of weight percentage relative to the total amount of Fe2O3, MnO, and ZnO 2 , 900ppm of CaCO 3 , 200ppm ZrO 2 , 200ppm Nb 2 o 5 and 100ppm Na 2 O, where Na 2 O with NaCl or Na 2 CO 3 The form of adding, wet sanding, ferrite slurry. Add 1wt% PVA binder calculated by ferrite powder weight to the slurry for spray granulation. Under a certain pressure, the granulated powder is molded into a standard ring ferrite core for testing. The molded body was sintered at 1250° C. for 3 hours under the condition of oxygen partial pressure concentration of 0.005%, wherein the heating rate was 4° C. / min in the heating stage of 1000° C. to 1250° C., and the oxygen partial pressure concentration was 3%. Co...

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Abstract

The present invention relates to a soft magnetic ferrite material and preparation method, specifically to a highly saturated magnetic flux density low-loss soft magnetic ferrite material and preparation method thereof. The present invention is mainly directed to resolve low saturated magnetic flux density and large loss and the like problems existing in the prior art, the invention provides highly saturated magnetic flux density low-loss soft magnetic ferrite material which has high saturation magnetic flux density, low loss and adaptation to the prior large-scale production and preparation method thereof by the improvement of composition. The main technical program of this invention as follows: the principal components are 53.4 - 54.6mol% of Fe2O3, 2 - 9mol% of ZnO and 37.6 - 43.4mol% of MnO; the vice components are 150 - 200ppm of SiO2, 600 - 1200ppm of CaCO3, 150 - 250ppm of ZrO2, 150 - 200ppm of Nb2O3, and 100 - 200ppm of Na2O.

Description

technical field [0001] The invention relates to a soft ferrite material and a preparation method, in particular to a high saturation magnetic flux density and low loss soft ferrite material and a preparation method. Background technique [0002] MnZn ferrite is widely used in electronics and communication fields as power transformer materials. The operating temperature of a traditional switching power supply transformer is generally 60-100°C, and the operating frequency is 10-100kHz. In order to reduce the core loss of ferrite devices in the transformer operating temperature range, various studies have been carried out so far, such as the addition of additives, element substitution, and optimization of process conditions, to reduce the loss of ferrite cores in the transformer operating temperature range, such as Chinese invention patent publications CN1402266, CN1492453, CN1896032, CN1286237, etc. With the development of switching power supply in the direction of miniaturi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/34C04B35/26C04B35/622
Inventor 颜冲吕东华雷国莉包大新
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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