阅读说明：本技术 一种磁导率35羰基铁粉心 (35 carbonyl iron powder core of magnetic conductivity ) 是由 孙长青 陈丽莉 孟苏衡 李双良 卢燕 于 2020-04-20 设计创作，主要内容包括：本发明公开了一种磁导率35羰基铁粉心,所述铁粉心原料包括：羰基铁、铬酸盐、磷酸、组分A、组分B、润滑剂。使用本发明技术方案得到的磁导率35羰基铁粉心,实现了磁导率35羰基铁粉心在180摄氏度条件下,8760小时情况下性能保持基本不变的状态,无明显热老化现象发生。铁粉心损耗与目前市场上同类铁粉心相比减少30%~50%。(The invention discloses a 35-carbonyl iron powder core with magnetic conductivity, which comprises the following raw materials: carbonyl iron, chromate, phosphoric acid, a component A, a component B and a lubricant. The magnetic conductivity 35 carbonyl iron powder core obtained by the technical scheme of the invention realizes that the performance of the magnetic conductivity 35 carbonyl iron powder core is kept in a basically unchanged state under the condition of 180 ℃ for 8760 hours, and no obvious thermal aging phenomenon occurs. Compared with the similar iron powder cores in the current market, the iron powder core loss is reduced by 30-50%.)

1. The magnetic permeability 35 carbonyl iron powder core is characterized in that the raw materials of the carbonyl iron powder core comprise: carbonyl iron, chromate, phosphoric acid, a component A, a component B and a lubricant, wherein the component A comprises: one or more of mica, kaolin and diatomite, wherein the component B comprises: silica sol, alumina sol, silica-alumina sol, or a mixture thereof.

2. The carbonyl iron powder core of claim 1, wherein the carbonyl iron powder core feedstock comprises: 100 parts of carbonyl iron, 0.18-0.6 part of chromate, 0.2-0.8 part of phosphoric acid, 0.5-1.2 parts of component A, 2-6 parts of component B and 0.2-0.8 part of lubricant.

3. The carbonyl iron powder core of claim 2, wherein the carbonyl iron powder core feedstock comprises: 100 parts of carbonyl iron, 0.3-0.6 part of chromate, 0.3-0.6 part of phosphoric acid, 0.5-1.2 parts of component A, 2-6 parts of component B and 0.3-0.6 part of lubricant.

4. The carbonyl iron powder core according to any one of claims 1 to 3, wherein the carbonyl iron is carbonyl iron powder, and the particle size of the carbonyl iron powder is D10= 1.5-3.5 microns, D50= 3.0-5.5 microns, and D90= 6.0-9.5 microns.

5. Carbonyl iron powder core according to any one of claims 1 to 3, characterized in that the chromate comprises potassium dichromate, potassium dichromate or calcium dichromate, preferably the chromate is potassium dichromate.

6. Carbonyl iron powder core according to any one of claims 1 to 3, characterized in that the lubricant comprises: lithium stearate, zinc stearate, barium stearate or calcium stearate, preferably, the lubricant is lithium stearate.

7. Carbonyl iron powder core according to any one of claims 1 to 3, characterized in that said component A comprises: one or more of mica, kaolin and diatomite.

8. A carbonyl iron powder core according to any one of claim 7, characterized in that, said component A is powder with particle size of 0-15 μm (excluding end 0).

9. Carbonyl iron powder core according to any one of claims 1 to 3, characterized in that said component B comprises: one or more of silica sol, aluminum sol and silicon-aluminum sol.

10. The carbonyl iron powder core according to any one of claims 1 to 3, wherein the raw material for the carbonyl iron powder core further comprises water and alcohol, the water and chromate form an aqueous solution of 6 to 10wt% of chromate, and the alcohol and phosphoric acid form an alcoholic solution of 2 to 4wt% of phosphoric acid.

Technical Field

The invention relates to the field of materials, in particular to a 35 carbonyl iron core with magnetic conductivity.

Background

With the development of modern electronic information industry technology, the application market scale of the iron powder core is gradually increased, and the iron powder core is mainly applied to an electric appliance loop to solve the problem of electromagnetic compatibility (EMC). In practical application, various other substances can be added according to different requirements on filtering under different wave bands. The iron powder core is a common soft magnetic material and is one of the materials with lower market price at present. The material is composed of carbon-based ferromagnetic powder and resin carbon-based ferromagnetic powder, and due to low price, the iron powder core is still the magnetic powder core with the largest use amount so far, and the magnetic conductivity is between 10 and 100. The magnetic conductivity 35 carbonyl iron powder core is used as one kind of iron powder core and is widely applied to modern instruments and equipment.

Although the raw materials and the formula of the carbonyl iron powder core in the prior art are numerous, the magnetic conductivity 35 carbonyl iron powder core obtained by adopting the existing raw materials and the formula cannot meet the requirements of practical application, cannot resist high temperature in the using process, is easy to age and burn, seriously restricts the production efficiency and even the development of science and technology, and therefore, a new magnetic conductivity 35 carbonyl iron powder core is urgently needed to be researched.

Disclosure of Invention

The invention solves the problems that the existing 35 carbonyl iron powder core with magnetic conductivity cannot be used at a higher temperature in the application process and can burn due to aging after long-term use.

In order to solve the technical problem, the technical scheme is as follows: providing a 35-carbonyl iron powder core with magnetic permeability, wherein the iron powder core comprises the following raw materials: carbonyl iron, chromate, phosphoric acid, a component A, a component B and a lubricant.

On the basis of the raw materials, through further experimental study, the carbonyl iron powder core raw materials comprise: 100 parts of carbonyl iron, 0.18-0.6 part of chromate, 0.2-0.8 part of phosphoric acid, 0.5-1.2 parts of component A, 2-6 parts of component B and 0.3-0.6 part of lubricant.

In a specific embodiment of the present invention, the carbonyl iron powder core raw material includes: 100 parts of carbonyl iron, 0.3-0.6 part of chromate, 0.3-0.6 part of phosphoric acid, 0.5-1.2 parts of component A, 2-6 parts of component B and 0.3-0.6 part of lubricant.

In the invention, the carbonyl iron is carbonyl iron powder, and the granularity of the carbonyl iron powder is D10= 1.5-3.5 microns, D50= 3.0-5.5 microns, and D90= 6.0-9.5 microns.

In the present invention, the chromate includes potassium dichromate, sodium dichromate, calcium dichromate, etc., and preferably, the chromate is potassium dichromate.

In the present invention, the lubricant comprises: lithium stearate, zinc stearate, calcium stearate, barium stearate, and the like, and in one embodiment of the invention, the lubricant is lithium stearate.

In the present invention, the component a comprises: one or more of clay such as mica, kaolin, and diatomite.

The component A can play a role in supporting the carbonyl iron core, can help the carbonyl iron to form effective gaps in the carbonyl iron core manufactured after molding, is helpful to improve the direct current lamination characteristic of the carbonyl iron core, and is also beneficial to bearing higher sintering temperature of the carbonyl iron core during high-temperature heat treatment.

In the invention, the component A is powder, and the particle size of the component A is 0-15 microns (excluding an endpoint of 0).

In the present invention, the component B comprises: one or more of silica sol, aluminum sol and silicon-aluminum sol.

According to the invention, the carbonyl iron powder core raw material also comprises one or two of water and alcohol, the carbonyl iron powder core raw material also comprises water and alcohol, the water and chromate are prepared into 6-10 wt% of chromate water solution, and the alcohol and phosphoric acid are prepared into 2-4 wt% of phosphoric acid alcohol solution. The invention adopts the mixed solution of alcohol and water as the solvent to accelerate the generation of the chromium oxide film.

The reason for generating thermal aging is that the organic binder causes the characteristic failure of the material and the loss of the insulation effect due to the decomposition of organic functional groups under the high-temperature condition, thereby causing the reduction of the insulation effect among powder particles to be weak or disappear, causing the eddy current loss of the carbonyl iron powder core to be greatly increased, causing the temperature of the carbonyl iron powder core to be further increased, further aggravating the aging failure of the organic binder, causing the vicious circle to finally cause the over-high loss of the carbonyl iron powder core, causing the complete failure of the iron powder core and seriously causing the burning of the circuit board.

On the basis of the raw materials, the preparation method of the 35 carbonyl iron powder core with the magnetic conductivity is also researched, and the preparation method of the 35 carbonyl iron powder core with the magnetic conductivity comprises the following steps:

a. mixing carbonyl iron with 6-10% of chromate aqueous solution, and simultaneously continuously adding 2-4 wt% of phosphoric acid alcohol solution, wherein the weight ratio of the chromate aqueous solution to the carbonyl iron is 3-6%, preferably 5%, and the weight ratio of the phosphoric acid alcohol solution to the carbonyl iron is 10-15%, preferably 15%;

b. drying the material obtained in the step a at 70 ℃, and then treating the material for 90 minutes at 150 ℃;

c. adding an alcohol solution containing the component A into the material obtained in the step b, and stirring the mixture to a dry state, wherein the weight ratio of the component A to carbonyl iron is 0.5-1.2%, and the weight ratio of the alcohol to the carbonyl iron is 8-15%;

d. c, mixing the material obtained in the step c with a component B, and drying, wherein the weight ratio of the component B to carbonyl iron is 2-6%;

e. and d, adding a lubricant into the material obtained in the step d, wherein the weight of the lubricant is 0.3-0.6% of the weight of the material, and then performing compression molding to obtain the material.

The steps a to e ensure that the surface of each powder particle can be fully contacted with the component B, and the anti-aging effect is good.

In the step e, the condition of press forming is 5-18T/cm²Is pressed and molded under the pressure of (2), and further is 8-18T/cm²Preferably 10 to 18T/cm²Is press-formed under a pressure of (1).

The preparation method further comprises the step of carrying out heat treatment on the carbonyl iron powder core subjected to compression molding under the inert gas condition, wherein the heat treatment temperature is 400-600 ℃, and the time is 60-120 min.

The invention provides a 35 carbonyl iron powder core with low loss and high direct current superposition characteristic and no aging, which has better surface coating effect by adding non-aging high-temperature-resistant components and matching with an effective surface treatment process and a method, and ensures that each particle can be fully contacted with the added non-aging high-temperature-resistant components. Compared with the same type of carbonyl iron powder cores in the current market, the loss of the carbonyl iron powder cores is reduced by 30-50%.

Detailed Description

The technical solution of the present invention will be further specifically described below by way of specific examples.

In the present invention, all the raw materials and equipment used are commercially available unless otherwise specified.