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Method for lot production of MnZn power ferrite containing high frequency and low loss

A mass production, high frequency technology, applied in the field of mass production of high frequency and low loss MnZn power ferrite, can solve the problems of low energy loss, limited use range, large energy consumption, etc., and achieve low energy loss, initial magnetic permeability The effect of high efficiency and low power loss

Active Publication Date: 2008-06-25
HENGDIAN GRP DMEGC MAGNETICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention mainly solves the technical problems of limited application range and high energy consumption in the prior art, and provides a method for batch production of high-frequency and low-loss MnZn power ferrites with wide application range and low energy loss

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] MnZn ferrite, its basic composition is 52-56mol% Fe 2 o 3 , 1 to 4 mol% of ZnO, and the rest is MnO. Its secondary components contain 0.001-0.008wt% SiO 2 and 0.1-0.4wt% CaCO 3 . The above sub-components are equivalent to Fe 2 o 3 , MnO, and ZnO are calculated in weight percent.

[0022] The flow process of the production process of this MnZn ferrite is:

[0023] 1) Ingredients: Weigh the raw materials with an electronic balance to ensure the accuracy of the weighing.

[0024] 2) Vibration grinding: using a vibrating mill for 0.5 hours.

[0025] 3) Pre-burning: The powder is directly pre-fired in a double-push air kiln, the temperature and time are 800°C to 900°C, and the time is 2 hours.

[0026] 4) Sand milling: the pre-fired material is sand-milled with a sand mill for 110 minutes, burning material: balls: water = 1:5:0.55, and the average particle size of the crushed powder is 1.0 μm.

[0027] 5) Molding: It is carried out by a fully automatic dry press, a...

Embodiment 2

[0032] 1) Ingredients: Weigh the raw materials with an electronic balance to ensure the accuracy of the weighing.

[0033] 2) Vibration grinding: use a vibrating mill for vibrating grinding, and the vibrating grinding time is 1 hour.

[0034] 3) Pre-burning: The powder is directly pre-fired in a double-push air kiln, the temperature and time are 900 ° C ~ 1000 ° C, and the time is 3 hours.

[0035] 4) Sand milling: The pre-fired material is sand-milled with a sand mill for 110 minutes, burning material: balls: water = 1:6:0.65, and the average particle size of the crushed powder is 1.0 μm.

[0036] 5) Molding: It is carried out by a fully automatic dry press, and the density of the blank is 2.8-3.3g / cm 3 , The dimensional tolerance is ±0.1mm.

[0037] 6) Sintering: use a sintering furnace to ensure the uniformity of the atmosphere and temperature, and use a bell kiln for sintering, the sintering temperature is 1280 ° C, and the time is 3 hours.

[0038] 7) Spray granulation...

Embodiment 3

[0041] The flow of the production tooling process is:

[0042] 1) Ingredients: Weigh the raw materials with an electronic balance to ensure the accuracy of the weighing.

[0043] 2) Vibration grinding: Use a vibrating mill to vibrate and grind, and the vibration grinding time is 0.5 to 1 hour

[0044] 3) Pre-burning: The powder is directly pre-fired in a double-push air kiln, and the temperature and time are generally 900°C (±100°C)×2.5 hours

[0045] 4) Sanding: The pre-fired material is sanded with a sand mill for 130 minutes, material: ball: water = 1:6:0.65, and the average particle size of the crushed powder is 1.4 μm.

[0046] 5) Molding: It is carried out by a fully automatic dry press. The density of the blank is controlled at 2.8~3.3g / cm3, and the dimensional tolerance is controlled at ±0.1mm. The inspectors conduct random inspections on the density and size of the formed blank.

[0047] 6) Sintering: use a sintering furnace to ensure the uniformity of the atmospher...

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Abstract

The invention belongs to the magnetic material field, in particular relates to a method for the mass production of a MnZn power ferrite with high-frequency and low loss. The invention mainly solves the technical problems existing in the prior art that the utilization range is limited, and the energy consumption is large, etc., and provides the method for the mass production of the MnZn power ferrite with high-frequency and low loss. The invention comprises the following main steps: raw materials are weighed, and then vibrated and milled to obtain powder lot; the powder lot is directly pre-burned by adopting a double push plate air kiln to obtain preburning material; the preburning material is sanded by adopting a sand mill; the preburning material is molded by adopting a fully automatic dry press machine; a molded blank is sintered by adopting an asintering furnace; the granule manufacture is performed to the blank by adopting a spray drying granulating machine; the surface of the blank is processed to the roughness degree that Ra is equals to 0.2 to 1.4 microns by adopting a double axle grinding machine.

Description

technical field [0001] The invention belongs to the field of magnetic materials. In particular, it relates to a method for batch production of high-frequency and low-loss MnZn power ferrite. Background technique [0002] At present, in the domestic methods for producing MnZn power ferrite, most of them adopt several steps of mixing, pre-sintering, doping, secondary ball milling, molding and sintering. However, due to the different materials selected for various MnZn power ferrites, different processing methods will be used, and the obtained MnZn power ferrites will have great differences in performance due to slight differences in raw materials or differences in production processes. [0003] For example, a Chinese patent No. CN200610022470.3 discloses a preparation method of a high-frequency high-power ferrite material, which includes the following steps: 1) mixing: 51-55mol% Fe2O3, 5-10mol% ZnO, and The amount of MnCO3 powder is mixed evenly; 2) pre-calcination: pre-calc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01F1/10C04B35/38C04B35/622
Inventor 严正信刘亚丕包大新金鑫
Owner HENGDIAN GRP DMEGC MAGNETICS CO LTD
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