阅读说明：本技术 一种高频高阻抗锰锌铁氧体材料及其制备方法 (High-frequency high-impedance manganese-zinc ferrite material and preparation method thereof ) 是由 张强原 邢冰冰 宋岩岩 李小龙 陈振宁 *** 于 2020-07-29 设计创作，主要内容包括：本发明涉及软磁铁氧体技术领域,尤其是一种高频高阻抗锰锌铁氧体材料及其制备方法,其主成份以氧化物计算由Fe<Sub>2</Sub>O<Sub>3</Sub>：48～49.7mol％,MnO：29～33mol％,ZnO：19～21mol％,Co<Sub>2</Sub>O<Sub>3</Sub>：0.03～0.08mol％组成；按主成分重量计的副成分包括Nb<Sub>2</Sub>O<Sub>5</Sub>：0.01～0.05wt％、CaCO<Sub>3</Sub>：0.02～0.05wt％,SnO<Sub>2</Sub>：0.01～0.08wt％、Bi<Sub>2</Sub>O<Sub>3</Sub>：0.01～0.06wt％,MoO<Sub>3</Sub>：0.01～0.05wt％中的至少三种。该高频高阻抗锰锌铁氧体材料的制备方法采用的工艺步骤是：配料、预烧、砂磨、造粒、成型、烧结。与现有技术相比,本材料具有高频高阻抗、高居里温度、价格低廉等优良特性,可以满足电子设备对EMI的高需求。(The invention relates to the technical field of soft magnetic ferrite, in particular to a high-frequency high-impedance manganese-zinc ferrite material and a preparation method thereof 2 O 3 ：48～49.7mol％，MnO：29～33mol％，ZnO：19～21mol％，Co 2 O 3 : 0.03-0.08 mol%; the minor component comprising Nb by weight of the major component 2 O 5 ：0.01～0.05wt％、CaCO 3 ：0.02～0.05wt％，SnO 2 ：0.01～0.08wt％、Bi 2 O 3 ：0.01～0.06wt％，MoO 3 : 0.01 to 0.05 wt% of at least three. The preparation method of the high-frequency high-impedance manganese-zinc ferrite material adopts the following process steps: proportioning, presintering, sanding, granulating, molding and sintering. Compared with the prior art, the material has high frequency and high strengthImpedance, high Curie temperature, low price and the like, and can meet the high requirement of electronic equipment on EMI.)

1. A high-frequency high-impedance manganese-zinc ferrite material is characterized in that: consists of a main component and a secondary component, the main component is calculated by oxide and is Fe₂O₃:48～49.7mol％，MnO：29～33mol％，ZnO:19～21mol％，Co₂O₃: 0.03-0.08 mol%; the minor component comprising Nb by weight of the major component₂O₅：0.01～0.05wt％、CaCO₃：0.02～0.05wt％，SnO₂：0.01～0.08wt％、Bi₂O₃：0.01～0.06wt％，MoO₃: 0.01 to 0.05 wt% of at least three.

2. The high-frequency high-impedance manganese-zinc ferrite material according to claim 1, wherein: the main component is Fe₂O₃：49～49.7mol％，MnO：29～32mol％，ZnO：19～20mol％，Co₂O₃: 0.05 to 0.08 mol%.

3. The high-frequency high-impedance manganese-zinc ferrite material according to claim 1, wherein: the main component is Fe₂O₃：48.5mol％，MnO：31mol％，ZnO：20mol％，Co₂O₃: 0.05 mol%; the accessory component is Nb₂O₅:0.02wt％、CaCO₃：0.03wt％、SnO₂0.04 wt%, the above-mentioned secondary components being Fe₂O₃、MnO、ZnO、Co₂O₃The total weight percent is calculated.

4. The high-frequency high-impedance manganese-zinc ferrite material according to claim 1, wherein: the main component is Fe₂O₃：49.5mol％，MnO：30.6mol％，ZnO：19.5mol％，Co₂O₃:0.04 mol%; the accessory component is Nb₂O₅：0.03wt％、SnO₂:0.04wt％，MoO₃: 0.02 wt% of the above-mentioned auxiliary component (by weight) Fe₂O₃、MnO、ZnO、Co₂O₃The total weight percent is calculated.

5. The high-frequency high-impedance manganese-zinc ferrite material according to claim 2, wherein: the main component is Fe₂O₃：49.7mol％，MnO：29.6mol％，ZnO：20mol％，Co₂O₃: 0.07 mol%; the accessory ingredient is CaCO₃：0.02wt％，Bi₂O₃：0.02wt％，SnO₂：0.05wt％,MoO₃:0.03 wt% of the above-mentioned auxiliary component based on Fe₂O₃、ZnO、MnO、Co₂O₃The total weight percent is calculated.

6. The high-frequency high-impedance manganese-zinc ferrite material according to claim 2, wherein: the main component is Fe₂O₃：49mol％，MnO：30.5mol％，ZnO：19.0mol％，Co₂O₃: 0.05 mol%; the accessory component is Nb₂O₅:0.04wt％、CaCO₃：0.02wt％、SnO₂:0.05wt％、MoO₃:0.03 wt% of the above-mentioned auxiliary component based on Fe₂O₃、MnO、ZnO、Co₂O₃The total weight percent is calculated.

7. The preparation method of the high-frequency high-impedance manganese-zinc ferrite material as claimed in any one of claims 1 to 6, which is characterized by comprising the following steps:

1) preparing materials: according to the principal component Fe₂O₃、MnO、ZnO、Co₂O₃The materials are weighed, mixed and sanded, and the sanding time is 15-30 min;

2) pre-burning: pre-burning the mixed powder at 850-1050 ℃;

3) sanding: adding the auxiliary components into the pre-sintered material for secondary mixing treatment, wherein the sanding time is 40-70 min, and the particle size is 1.3-2.0 mu m;

4) and (3) granulation: drying the ground slurry and then granulating;

5) molding: pressing the granulated granules to obtain a required blank T25 x 15 x 7.5;

6) and (3) sintering: and sintering the blank in a push plate kiln at 1270-1300 ℃.

8. The preparation method of the high-frequency high-impedance manganese-zinc ferrite material according to claim 7, characterized in that: the sintering temperature in the step 6) is 1280-1300 ℃.

Technical Field

The invention relates to the field of soft magnetic ferrite, in particular to a manganese-zinc ferrite material.

Background

In the electronic information age, with the rapid development of satellite communication, mobile communication, computer application and the like, the influence of electromagnetic interference (EMI) in the military and civil electronic information fields is more and more serious, and great harm is caused to public environment, personal safety and information confidentiality. An effective solution to reduce electromagnetic pollution and to improve the EMI resistance of electronic devices is to use electromagnetic compatibility (EMC) designs, in which a large amount of EMI resistant materials, i.e., high resistance materials, are used. With the sound electromagnetic compatibility laws and regulations in various countries, especially with the filtering requirements of vehicle electronics, the demand for 100MHz frequency up to 100MHz, 100MHz high frequency EMI resistant material ferrite cores is increasing.

The high-conductivity material is widely applied to EMI (electro-magnetic interference) because of high initial permeability, but the application frequency is mainly concentrated below 1MHz, and the impedance is low under 25MHz and 100MHz, so that the future demand development is difficult to meet. At present, NiZn material is mainly used for high-frequency EMI, but the magnetic permeability of the NiZn material is difficult to reach more than 2500, the NiZn material is expensive, and the Curie temperature and the saturation magnetic flux density are both low.

In order to meet the higher and higher characteristic requirements of EMI on materials, the characteristics of the materials need to be combined: high magnetic conductivity, high Curie temperature, high impedance at high frequency, high saturation magnetic flux density, etc.

Disclosure of Invention

In order to solve the technical problems, the invention provides a high-frequency high-impedance manganese-zinc ferrite material with the magnetic conductivity of 3000 and a preparation method thereof.

In order to achieve the purpose, the invention provides the following technical scheme:

a high-frequency high-impedance Mn-Zn ferrite material is composed of main component and auxiliary component, the main component is calculated by oxide and is Fe₂O₃:48～49.7mol％，MnO：29～33mol％，ZnO:19～21mol％，Co₂O₃: 0.03-0.08 mol%; the minor component comprising Nb by weight of the major component₂O₅：0.01～0.05wt％、CaCO₃：0.02～0.05wt％，SnO₂：0.01～0.08wt％、Bi₂O₃：0.01～0.06wt％，MoO₃: 0.01 to 0.05 wt% of at least three.

Further, the main component is made of Fe₂O₃：49～49.7mol％，MnO：29～32mol％，ZnO：19～20mol％，Co₂O₃: 0.05 to 0.08 mol%.

The preparation method of the high-frequency high-impedance manganese-zinc ferrite material comprises the following steps:

1) preparing materials: according to the principal component Fe₂O₃、MnO、ZnO、Co₂O₃The materials are weighed, mixed and sanded, and the sanding time is 15-30 min;

2) pre-burning: pre-burning the mixed powder at 850-1050 ℃;

3) sanding: adding the auxiliary components into the pre-sintered material for secondary mixing treatment, wherein the sanding time is 40-70 min, and the particle size is 1.3-2.0 mu m;

4) and (3) granulation: drying the ground slurry and then granulating;

5) molding: pressing the granulated granules to obtain a required blank T25 x 15 x 7.5;

6) and (3) sintering: and sintering the blank in a push plate kiln at 1270-1300 ℃.

Further, the sintering temperature in the step 6) is 1280-1300 ℃.

Compared with the prior art, the invention has the beneficial effects that:

the manganese-zinc ferrite material prepared by the method has the advantages that through the selection of components and the optimization of a sintering process, the initial permeability can reach 3000, the Curie temperature is above 130 ℃, the 25MHz impedance (the wire diameter is 0.5mm and the length is 165mm, and 1Ts) reaches 50 omega, the 100MHz impedance reaches 120 omega, and the manganese-zinc ferrite material has higher high-frequency impedance, can be sintered in a pushed slab kiln, and is low in cost.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.