Preparation of high-frequency high temperature low loss MnNiZn ferrite material

A ferrite material, low-loss technology, applied in the field of materials, can solve problems such as inability to achieve

Inactive Publication Date: 2009-07-22
王永安 +1
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But the various preparation techniques disclosed at presen

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[0005] This specific embodiment adopts the following process: 1.55mol% Fe↓[2]0↓[3], 4.5mol%ZnO, 1.5mol%NiO, 39mol%MnCO↓[3] ball milling and mixing; 2. Gained in step 1 The powder is pre-fired at 950°C; 3. Add the following additives to the powder obtained in step 2 according to the mass ratio: 0.02wt% CaO, 0.04wt% SnO↓[2], 0.02wt% ZrO↓[2], 0.05wt% V↓[2]0↓[5], and ball milling again, so that the particle size of the powder after ball milling reaches submicron level; 4. Forming; 5. Sintering. Forming in step 4: add 8wt% organic binder to the powder obtained in step 3, mix and granulate to shape according to the required shape and size. Sintering in step 5: place the blank obtained in step 4 in an atmosphere sintering furnace, and sinter at 1320° C. for 2.5 hours in an equilibrium atmosphere with an oxygen partial pressure of 5%. This specific embodiment adopts the appropriate formula, increases the amount of additives added, and the characteristics of sintering under the condit...

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Abstract

The invention discloses a preparation method for a high-frequency high-temperature low-loss MnNiZn ferrite material, which relates to the material technology, in particular to a preparation method for a ferrite material. The invention employs the following technique: 1. ball-grinding and uniformly mixing 52 to 58mol percent of Fe2O3, 3 to 9mol percent of ZnO, 0.5 to 5mol percent of NiO, as well as 35 to 45mol percent of MnCO3; 2. preburning the powder obtained in step 1 at certain temperature; 3. adding additive into the powder obtained in step 2 according to a weight percentage and then ball-grinding secondarily to lead the grain diameter of the powder to achieve submicron; 4. shaping; and 5. sintering. The invention employs a proper compounding formula, enlarges the mixed amount of the additive, and employs the characteristic of sintering under an oxidizing atmosphere condition to enlarge the grain boundary resistance rate of the materials, and reduce the vortex loss under high frequency, thereby achieving the goal of reducing the loss under the conditions of high frequency and high temperature.

Description

Technical field: [0001] The invention relates to material technology, in particular to a preparation method of a ferrite material. Background technique: [0002] At present, the preparation process of ferrite materials is very transparent. Generally, the preparation process of ferrite materials needs to go through: formulation, primary ball milling, pre-sintering, doping, secondary ball milling, sintering and so on. The purpose of these processes is to increase the grain boundary resistivity of the material and reduce the eddy current loss at high frequency, so as to achieve the purpose of reducing the loss under high frequency and high temperature conditions. However, the various preparation techniques disclosed at present cannot achieve good results for the above-mentioned purpose. Invention content: [0003] The purpose of the present invention is to provide a method for preparing a high-frequency, high-temperature, low-loss MnNiZn ferrite material, which can increase ...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622
Inventor 王永安庄彦军
Owner 王永安
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