Wide-temperature low-power consumption ferrimagnetism material

Abstract

The invention relates to a wide-temperature low-power consumption ferrimagnetism material, prepared by adopting a method comprising the following steps: (1) burdening, namely preparing 52-58mol% of Fe2O3, 6-13mol% of ZnO, 29-42mol% of metal Mn powder and 0.1-1.0mol% of Co2O3; (2) adding the metal Mn powder and ZnO into a reaction tank filled with deionized water for carrying out binary reaction, then respectively adding Fe2O3 and Co2O3, and mixing; (3) drying the synthesized size obtained in the step (2) until the water content is lower than 0.7%; (4) placing the material obtained in the step (3) in a rotary kiln to be pre-burned until more than 90% of the material is subjected to ferro-oxidization; (5) respectively adding 100-1000ppm of trace elements Ca, Zr, Nb, Sn, Ti and Ta, and stirring to be uniform; (6) ball milling; (7) pelleting; (8) shaping; (9) sintering; and (10) grinding. The magnetic material in the invention has high magnetic conductivity and wide use temperature range, the power consumption at normal temperature is reduced by 30% when the magnetic material is in a standby state; the energy conversion efficiency of the material is improved by 25% and the volume is reduced by one third when the material is applied to an LCD (liquid crystal display) backlight power converter and a POP power transformer; and the material is beneficial to miniaturization and lightening of an automobile power.

Description

technical field [0001] A ferrite magnetic material, in particular to a ferrite magnetic material with wide temperature and low power loss. Background technique [0002] The magnetic properties of existing manganese-zinc power ferrite magnetic materials have a strong temperature dependence, and the loss is also different at different temperatures. If the relationship between core loss and temperature is shown in a graph, it can generally be visualized with a "V" shape. The bottom of the "V" shape corresponds to the temperature point of the minimum core loss, above or below this temperature point, the core loss will rise rapidly. Generally, the operating temperature of the device is designed at the bottom point of the "V" shape, so that the magnetic core can be used efficiently, and the electronic transformer will not be burned due to the continuous accumulation of heat. [0003] With the continuous development of electric transportation vehicles, such as the development of H...

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Problems solved by technology

[0004] In addition, in the field of AV equipment, LCD TVs and large-screen LCDs are rapidly developing. A considerable number of cold-cathode tubes used as backlights and inverter circuit units for lighting are installed on the back of these large-scale LCDs. The heat release efficiency varies depending on the installation location, and there is a gradient in the maximum temperature that can be achieved. It is difficult to completely realize energy saving with the previous materials designed for a certain application temperature. Similar to this, the power supply that generates a temperature gradient There are also IP routers and gateways used in the communication field. Due to the rapid development and high speed of MPUs (microprocessors), network processors, storage controllers, etc., 400W and 500W level multi-stage rack installation methods have been adopted. The forced air cooling in the cooling frame dissipates heat from the power circuit, and the temperature gradient between the central part and the peripheral part is also difficult to eliminate

[0005] The preparation method of existing manganese zinc power ferrite magnetic material is all based on Fe 2 o 3 , Mn 3 o 4 or MnCO 3 , ZnO as the raw material, the relationship between the core loss and the temperature is "V" shape, and no fourth metal is found to change the characteristics of i-T and K1-T, or an effective method to introduce the fourth metal --Dilute or even eliminate the negative impact of the metal

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