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Manganese zinc ferrite soft magnet and its manufacturing method

A manganese-zinc ferrite and soft magnetic technology, which is applied in the direction of inductance/transformer/magnet manufacturing, inorganic material magnetism, electrical components, etc., can solve the problems of unconsidered, power consumption deterioration, etc., and achieve the goal of reducing power consumption and easy adjustment Effect

Active Publication Date: 2005-05-25
TDG HLDG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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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 magnet and its manufacturing method
  • Manganese zinc ferrite soft magnet and its manufacturing method
  • Manganese zinc ferrite soft magnet and its manufacturing method

Examples

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Embodiment 1

[0028] Embodiment 1, sintering according to the following steps shown in Fig. 2 curve:

[0029] ① Heating rate up to 900°C: 300°C / hour;

[0030] ② Heating rate up to 1300°C: 150°C / hour;

[0031] ③Insulation at 1300°C for 5 hours;

[0032] ④Cooling rate from 1300°C to 1200°C: 100°C / hour;

[0033] ⑤Insulate at 1200°C for 30 minutes;

[0034] ⑥Cooling rate from 1200°C to 1100°C: 100°C / hour;

[0035] ⑦Cooling rate from 1100°C to 600°C: 200°C / hour;

[0036] ⑧Cooling 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, and the difference from the prior art is that there is an additional heat preservation step 5, and the oxygen content in this step also remains unchanged.

Embodiment 2

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

Embodiment 3

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

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Abstract

This invention discloses a method for making manganese-zinc ferrite soft-magnet, which comprises at least one constant temperature insulation in temperature reducing period of sintering process wherein the temperature of constant temperature insulation is lower at least 50 deg.C centigrade than that in temperature reducing period, the optimal is lower at least 10 deg.C, the oxygen content keeps no change in this period. Said invention also discloses a manganese-zinc ferrite made by said method. Said invention has advantages of low power consumption and simple lowest temperature adjustment.

Description

technical field [0001] The invention relates to a manganese-zinc system ferrite soft magnetism and a manufacturing method thereof, in particular to a power ferrite suitable for making a power transformer magnetic core and a manufacturing method thereof. 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 ...

Claims

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Application Information

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IPC IPC(8): H01F1/34H01F41/02
Inventor 彭声谦邵峰李晓清钱琼辉
Owner TDG HLDG CO LTD
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