Magnesium-zinc soft magnetic ferrite and preparation method thereof

A soft ferrite, magnesium-zinc technology, applied in the field of magnesium-zinc soft ferrite and its preparation, can solve the problems of low cost, high cost, high loss of soft ferrite, etc., achieve low cost, improve Q value, improve The effect of resistivity

Inactive Publication Date: 2012-02-08
BYD CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problem of high loss or high cost of soft ferrite under high-frequency use in the prior art, the present invention provides a magnesium-zinc soft magnet with similar performance to nickel-zinc soft ferrite but relatively low cost Oxygen

Method used

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  • Magnesium-zinc soft magnetic ferrite and preparation method thereof
  • Magnesium-zinc soft magnetic ferrite and preparation method thereof

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preparation example Construction

[0044] The preparation method of above-mentioned magnesium-zinc soft magnetic ferrite comprises the following steps:

[0045] Step 1, ingredients: Weigh the raw materials of magnesium-zinc soft magnetic ferrite in proportion, and the raw materials include: iron oxide 68.92wt%-70.59wt%; zinc oxide 16.03wt%-18.52wt%; magnesium oxide 8.07wt%-9.83 wt%; copper oxide 3.62wt%-3.86wt%; bismuth trioxide 0.1wt%-0.3wt%; vanadium pentoxide 0.1wt%-0.3wt%; cobalt oxide 0.05wt%-0.3wt%; calcium carbonate 0.03 wt% - 0.10 wt%.

[0046] Step 2, the first ball mill: put the weighed iron oxide, zinc oxide, magnesium oxide, copper oxide, bismuth trioxide and vanadium pentoxide in a dry ball mill mixer and mix them for 4-6 hours After fully mixing, the material is discharged, and the mixed powder is obtained and then put into the sagger;

[0047] Step 3. Pre-sintering: Put the above-mentioned sagger containing the mixed powder into a pre-sintering furnace for pre-sintering, heat up from room tempe...

Embodiment 1-5

[0055] The preparation method of the magnesium-zinc soft magnetic ferrite of embodiment 1-5 of the present invention comprises the following steps:

[0056] 1), ingredients: weigh the raw materials of magnesium-zinc soft magnetic ferrite according to the components and ratios of Examples 1-5 in Table 1 respectively (the contents of the raw materials are all in weight percent wt%);

[0057] 2), ball milling for the first time: place the weighed iron oxide, zinc oxide, magnesium oxide, copper oxide, bismuth trioxide and vanadium pentoxide in a dry ball mill mixer and mix them thoroughly for 5 hours, then Discharge, put into the sagger;

[0058] 3) Pre-firing: Put the sagger into the pre-burning furnace for pre-firing, that is, raise the temperature from room temperature to about 800°C after 3 hours, then raise the temperature to about 900°C after 1 hour, and keep warm at 900°C for 3 hours. hours, and then cooled to below 200°C after 2 hours;

[0059] 4), the second ball millin...

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Abstract

The invention provides a magnesium-zinc soft magnetic ferrite. The magnesium-zinc soft magnetic ferrite comprises main ingredients and accessory ingredients, wherein the main ingredients comprise the following components in percentage by weight: 68.92 to 70.59 percent of ferric oxide, 16.03 to 18.52 percent of zinc oxide, 8.07 to 9.83 percent of magnesium oxide and 3.62 to 3.86 percent of copper oxide; and the accessory ingredients comprise the following components in percentage by weight: 0.1 to 0.3 percent of bismuth trioxide and 0.1 to 0.3 percent of vanadium pentoxide. The invention also relates to a method for preparing the magnesium-zinc soft magnetic ferrite. The performance of the material is close to that of a nickel-zinc soft magnetic ferrite, the loss of the magnesium-zinc soft magnetic ferrite is low when the magnesium-zinc soft magnetic ferrite is used at high frequency, and the cost is relatively lower.

Description

technical field [0001] The invention relates to the field of soft magnetic ferrite, and more specifically relates to a magnesium-zinc soft ferrite and a preparation method thereof. Background technique [0002] Soft ferrite is a ferrimagnetic material, and its magnetism comes from the superexchange between magnetic metal ions separated by oxygen atoms. At present, manganese-zinc ferrite and nickel-zinc ferrite are the most widely used soft ferrites. Manganese zinc ferrite has the advantages of high saturation magnetic induction and permeability, and low loss at low frequency, but it also has the disadvantages of low resistivity and the need for atmosphere protection during sintering. The resistivity of nickel-zinc ferrite is 3-8 orders of magnitude higher than that of manganese-zinc ferrite, which is more suitable for high-frequency use, with low high-frequency loss, especially suitable for high-frequency 1-300MHz, and does not require atmosphere protection during sintering...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/26C04B35/622
Inventor 王进军苟黎刚周俊东
Owner BYD CO LTD
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