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Low-loss MnZn ferrite and sintering technology thereof

A ferrite, low-loss technology, applied in the direction of magnetic objects, magnetic materials, electrical components, etc., to achieve the effect of increasing resistivity and reducing internal stress

Active Publication Date: 2017-02-15
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Manufacturers of soft ferrite at home and abroad have carried out a lot of research and mass production for this purpose, but no manufacturer has publicly produced 100 ℃ loss less than 250kW / m 3 ferrite

Method used

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  • Low-loss MnZn ferrite and sintering technology thereof
  • Low-loss MnZn ferrite and sintering technology thereof
  • Low-loss MnZn ferrite and sintering technology thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] 52.7mol% Fe 2 o 3 and 9.2mol% of ZnO, the rest is the amount of MnO, mixed in the ratio of 1:4:0.45 according to the ratio of ball water, sanded in the sand mill for 1 hour, then spray granulated, and carried out in the rotary kiln. burnt, the 0.06wt% CaCO 3 , 0.04wt% ZrO 2 , 0.01wt% Nb 2 o 5 and 0.08wt% SnO 2 Add it to the pre-fired material according to the quality of the pre-fired material, grind it in a sand mill for 160 minutes, and spray granulate. Press under a certain pressure to form a standard ring. Put it into a bell furnace for sintering, the sintering temperature is 1300°C, and keep warm for 300 minutes. Then cooled to room temperature under nitrogen protection.

Embodiment 2

[0025] 52.8mol% Fe 2 o 3 and 10.2mol% of ZnO, the rest is the amount of MnO, mixed in the ratio of 1:4:0.45 according to the ratio of ball water, sanded in a sand mill for 1 hour, then spray granulated, carried out in a rotary kiln pre-fired, 0.06wt% CaCO 3 , 0.04wt% ZrO 2 , 0.01wt% Nb 2 o 5 and 0.09wt% SnO 2 Add it to the pre-fired material according to the quality of the pre-fired material, grind it in a sand mill for 160 minutes, and spray granulate. Press under a certain pressure to form a standard ring. Put it into a bell furnace for sintering, the sintering temperature is 1300°C, and keep warm for 300 minutes. Then cooled to room temperature under nitrogen protection.

Embodiment 2 and comparative example 2

[0029] Table 2 Example 2 and Comparative Example 2 Sample Ring Performance Comparison

[0030]

[0031] It can be obtained from Table 2 that in Comparative Example 2, due to not adding SnO in the sub-formulation 2 , making the eddy current loss increase and the overall loss higher.

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Abstract

The invention discloses a low-loss MnZn ferrite and a sintering technology thereof. The low-loss MnZn ferrite mainly consists of a main formula and an auxiliary formula, wherein the main formula comprises 52.7 to 52.9mol% of Fe2O3, 9.2 to 11.2mol% of ZnO and the balance of MnO; the auxiliary formula comprises SnO2, CaCO3, ZrO2 and Nb2O5. The sintering technology comprises the following steps of putting the low-loss MnZn ferrite into a bell-type furnace, and sintering, wherein the temperature rise speed of a temperature rise section, the heat insulation temperature of a heat insulation section and the oxygen content of a temperature lowering section are controlled, so as to uniformly grow crystal grains, and reduce internal stress. The sintering technology of the low-loss MnZn ferrite has the beneficial effects that by jointly adding the CaCO3, the ZrO2 and the Nb2O5, the resistivity of a crystal interface is increased, and the crystal grains are fined, so that the crystal grains can uniformly grow; by adding the SnO2, the resistivity in the crystal grains is increased; by controlling the temperature rise speed of the temperature rise section, the heat insulation temperature of the heat insulation section and the oxygen content of the temperature lowering section, the crystal grains can uniformly grow, and the internal stress is reduced.

Description

technical field [0001] The invention relates to the related technical field of soft magnetic ferrite materials, in particular to a low-loss MnZn ferrite and its sintering process. Background technique [0002] MnZn ferrite is widely used in electronics and communication fields as power transformer materials. The parameter directly related to the output power of the traditional switching power supply and the material is the saturation magnetic flux density of the material. Materials with high saturation magnetic flux density can make the switching power supply more miniaturized and thinner. The power loss of the material will affect the conversion efficiency of electric energy. The lower the power loss, the higher the conversion efficiency of the device. [0003] At present, the soft magnetic MnZn ferrite material with the lowest loss at 100°C in the world is TDK's PC47, but with the development of miniaturization and high efficiency of electronic components, it is required...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/38C04B35/64H01F1/34
CPCC04B35/2633C04B35/2658C04B35/64C04B2235/3208C04B2235/3244C04B2235/3251C04B2235/3293C04B2235/656C04B2235/6584H01F1/344
Inventor 吕东华
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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