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Manganese zinc ferrite soft magnetic sinitering method

A technology of manganese-zinc ferrite and sintering method, which is applied in the direction of magnetic properties of inorganic materials, can solve the problems of deterioration of power consumption and unconsidered problems, and achieve the effect of reducing power consumption and easy adjustment

Inactive Publication Date: 2006-09-27
TDG HLDG CO LTD
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Problems solved by technology

[0004] figure 1 In the cooling stage, the temperature drops continuously, and the oxygen content decreases continuously according to the oxygen balance theory. The disadvantage is that the influence of the cooling rate on the oxidation-reduction reaction time is not considered, which leads to a slight decrease in oxygen content control when adjusting the minimum temperature of power consumption. Improperly, the power consumption will deteriorate

Method used

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  • Manganese zinc ferrite soft magnetic sinitering method
  • Manganese zinc ferrite soft magnetic sinitering method
  • Manganese zinc ferrite soft magnetic sinitering method

Examples

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Embodiment 1

[0029] Embodiment 1, sintering by the following process shown in Fig. 2 curve:

[0030] ① Heating rate up to 900°C: 300°C / hour;

[0031] ② Heating rate up to 1300°C: 150°C / hour;

[0032] ③Insulation at 1300°C for 5 hours;

[0033] ④ Cooling rate from 1300°C to 1100°C: 100°C / hour;

[0034] ⑤Then raise the temperature to 1200°C at a heating rate of 300°C / hour, and keep at constant temperature for 30 minutes;

[0035] ⑥Cooling rate from 1200°C to 600°C: 200°C / hour;

[0036] ⑦Cooling rate below 600°C: 150°C / hour;

[0037] In this example, the oxygen content is adjusted according to the theory of equilibrium oxygen partial pressure. The difference from the prior art is that step 5 of reheating and heat preservation is added, and the oxygen content during this step also undergoes a process of rising and remaining unchanged simultaneously.

Embodiment 2

[0038] Example 2: The heating and cooling rate and temperature distribution are the same as in Example 1. In order to move the lowest power consumption temperature to a low temperature, the overall oxygen content is lower than that of Example 1, as shown in the curve in FIG. 3 .

Embodiment 3

[0039] Implementation 3: The heating and cooling rate and temperature distribution are also the same as in Example 1. In order to move the lowest power consumption temperature to a high temperature, the overall oxygen content is higher than that in Example 1, as shown in the curve in Figure 4.

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Abstract

A process for sintering the soft-magnetic Mn-Zn ferrite features that in the cooling step of its sintering procedure, at least one step for raising temp and holding the temp is needed. The initial temp of raising temp step is at least 100 deg.C lower tan the temp is constant temp stage. The temp to be held is at least 50 deg.C lower than the temp in constant temp stage. The content of oxygen is synchronousely raised and held.

Description

technical field [0001] The invention relates to a soft magnetic sintering method of manganese-zinc ferrite, in particular to a sintering method of power ferrite suitable for making magnetic cores of power transformers. Background technique [0002] Manganese zinc ferrite is widely used in electronic equipment such as communications, electronic computers, and televisions. The miniaturization, flattening and high reliability of electronic instruments and equipment require ferrite soft magnets to have low power consumption, especially when the operating temperature is in the range of 60-140°C, lower power consumption is required. The temperature position of the lowest point of power consumption on the P-T curve (hereinafter referred to as "minimum temperature") is crucial to the performance of power ferrites. A suitable minimum temperature can make power ferrites have lower power consumption within the operating temperature range. [0003] A typical scheme of the sintering pro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26C04B35/64H01F1/34
Inventor 彭声谦邵峰李晓清钱琼辉
Owner TDG HLDG CO LTD
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