Manganese-zinc ferrite and preparation method thereof

A technology of ferrite and ferrite pre-fired material, which is applied in the field of manganese-zinc ferrite, can solve the problems of inconsistent deglue speed in microscopic areas, uneven temperature field and atmosphere field, and lower cut-off frequency

Active Publication Date: 2015-03-25
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the inconsistency of the glue discharge speed in the microscopic area and the inhomogeneity of the temperature field and the atmosphere field in the smaller magnetic ring inside the large-sized magne...

Method used

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  • Manganese-zinc ferrite and preparation method thereof
  • Manganese-zinc ferrite and preparation method thereof
  • Manganese-zinc ferrite and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] A preparation method of manganese-zinc ferrite (Ф79×Ф40×15 manganese-zinc R10k product), specifically comprising the following steps:

[0063] 1) Take 52.5mol% Fe 2 o 3 , 23.0mol% of ZnO and 24.5mol% of MnO, wet mixed for 30min, and sprayed to obtain a spray material;

[0064] 2) Pre-burn the primary spray material at 700-900°C for 2-3 hours to obtain the pre-fired material;

[0065] 3) According to the total weight of the ferrite pre-fired material, add auxiliary components 100ppm CaO, 300ppm Bi to the pre-fired material 2 o 3 , 200ppm MoO 3 , 200ppm Nb 2 o 5 and 100ppm Ti 2 o 5 , performing secondary wet sand grinding; controlling the particle size of the secondary wet grinding slurry to SMD=1.05-1.40 μm to obtain ferrite slurry;

[0066] 4) Add 0.5wt% PVA binder calculated by ferrite powder weight, 0.5wt% dispersant 1-methylpentanol and 0.2wt% defoamer siloxane to the ferrite slurry Spray granulation; the granulated powder is molded into a blank, and the de...

Embodiment 2

[0078] The green sample ring was pressed and formed according to the provisions of sample 5 in the above-mentioned embodiment 1, and filled according to the charging method in Table 3. After the filling is completed, sintering is carried out, and the specific operation of sintering is the same as in Example 1.

[0079] Table 3 shows the charging methods of different samples

[0080]

Number of stacks

Lower gasket

top cover

Gasket material permeability

Whether to burn

Sample 5

single

Have

Have

≥5000

Surrounded by fire

Sample 9*

single

Have

Have

≥5000

Not surrounded by fire

Sample 10*

single

Have

Have

<3000

Surrounded by fire

Sample 11*

single

none

Have

≥5000

Surrounded by fire

Sample 12*

single

Have

none

≥5000

Surrounded by fire

Sample 13*

single

none

none

≥5000

Surrounded ...

Embodiment 3

[0088] The green sample ring is pressed and formed according to the provisions of sample 5 in the above-mentioned embodiment 1, and the filling method is carried out according to the method of sample 5 in the embodiment 2. The specific operation of the heating and cooling curve of sintering is carried out according to Table 5, and the control of oxygen partial pressure in each temperature range is carried out according to Example 1.

[0089] Table 5 Sintering heating and cooling curve specific operation

[0090]

[0091]

[0092] *) indicates that it is outside the scope of the present invention; 19* is compared with the temperature rise rate before 950°C of 5; 20* is compared with the temperature rise rate after 950°C of 16; 21* is compared with the constant temperature of 15; 22* is compared with the constant temperature of 15 5 compared with the cooling rate after constant temperature;

[0093] Table 6 shows the test results of the initial permeability μi of samples ...

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PUM

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Abstract

The invention discloses a manganese-zinc ferrite of which the outer diameter is more than or equal to phi79mm and a preparation method thereof, and belongs to the technical field of manganese-zinc ferrite. The manganese-zinc ferrite disclosed by the invention comprises a ferrite pre-sintering material, an auxiliary component, a bonding agent, a dispersant and a defoamer, wherein the ferrite pre-sintering material consists of the following substances in molar percentage content: 52.0-53.0mol% of Fe2O3, 23.0-25.5mol% of ZnO and 21.5-25.0mol% of MnO; and the auxiliary component comprises CaO, Bi2O3, MoO3, Nb2O5 and Ti2O5. The preparation method disclosed by the invention can be used for preparing a manganese-zinc ferrite big magnetic ring of which the outer diameter is more than or equal to phi79mm; the obtained manganese-zinc ferrite big magnetic ring does not have cracking and marco-crystalline phenomena; and under the condition that the temperature is 25 DEG C and B is less than or equal to 0.25mT, the measured 10kHz initial magnetic permeability reaches 9000-11000, and the 100kHz magnetic permeability reaches 7000.

Description

technical field [0001] The invention belongs to the technical field of manganese-zinc ferrite, and in particular relates to a manganese-zinc ferrite with an outer diameter ≥ Ф79 mm and a preparation method thereof. Background technique [0002] With the decrease of traditional energy and the improvement of people's demand for environmental protection, human beings place their hopes on renewable energy, and solar energy has become the focus of people's attention. Since the 21st century, advanced countries such as Europe and the United States have incorporated solar photovoltaic power generation into urban power consumption systems, and the combination of solar cells and building systems has gradually formed an industrialization trend. The grid-connected system is the main direction of solar power generation technology and application development, and the grid-connected system requires a photovoltaic inverter. Photovoltaic inverter is the core component of photovoltaic power ...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622
Inventor 王国光孙永阳徐琛朱东梅黄巧媛沈冠群
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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