阅读说明：本技术 一种镍锌铁氧体配方及镀锌成型方法 (Nickel-zinc ferrite formula and galvanizing forming method ) 是由 徐勇翔 张振华 叶红艳 于 2020-09-03 设计创作，主要内容包括：本发明公开了一种镍锌铁氧体配方,用于将镍锌材料的烧结收缩率和烧结温度趋于一致；其中配方的百分比含量如下：氧化铁47.5-49.3；氧化镍17.5-28；氧化锌20-26.5；氧化铜：0-15。本发明通过调节镍锌材料的配方和锰锌的配方,使得两者的烧结收缩率和烧结温度趋于一致,且介于1200～1300摄氏度之间,同时采用控制气氛进行烧结,使得原材料共做一个镍锌铁氧体产品变得可行。(The invention discloses a nickel-zinc ferrite formula, which is used for enabling the sintering shrinkage rate and the sintering temperature of a nickel-zinc material to be consistent; wherein the percentage content of the formula is as follows: 47.5-49.3 parts of ferric oxide; 17.5-28 parts of nickel oxide; 20-26.5 parts of zinc oxide; copper oxide: 0-15. According to the invention, by adjusting the formula of the nickel-zinc material and the formula of the manganese-zinc material, the sintering shrinkage rate and the sintering temperature of the nickel-zinc material and the manganese-zinc material are consistent and are between 1200-1300 ℃, and meanwhile, the raw materials are sintered by adopting a controlled atmosphere, so that the raw materials can be used as a nickel-zinc ferrite product.)

1. A nickel zinc ferrite formula is characterized in that: the method is used for enabling the sintering shrinkage rate and the sintering temperature of the nickel-zinc material to be consistent; wherein the percentage content of the formula is as follows: 47.5-49.3 parts of ferric oxide; 17.5-28 parts of nickel oxide; 20-26.5 parts of zinc oxide; copper oxide: 0-15.

2. A galvanizing forming method is characterized in that: the method comprises the following specific steps:

a. mixing the raw materials using the formulation of claim 1 to ensure that the shrinkage and sintering temperatures of the materials remain consistent;

b. molding: the method adopts a two-step molding mode, one part of the magnetic core is molded by manganese zinc, and the other part of the magnetic core is molded by nickel zinc

c. And (3) sintering: the valence change of iron and manganese is controlled by controlling the atmosphere.

Technical Field

The invention relates to the technical field of galvanizing formulas, in particular to a nickel-zinc ferrite formula and a galvanizing forming method.

Background

At present, because nickel valence state of nickel zinc is stable, the surface resistance of a magnetic core is not low due to valence change during sintering, generally, the surface resistance of nickel zinc is more than 100000 ohms, and the conventional method is not easy to plate nickel zinc.

Disclosure of Invention

The invention provides a nickel zinc ferrite formula which enables the sintering shrinkage rate and the sintering temperature of the nickel zinc ferrite to be consistent.

In order to realize the technical purpose, the scheme of the invention is as follows: a nickel zinc ferrite formula is characterized in that: the method is used for enabling the sintering shrinkage rate and the sintering temperature of the nickel-zinc material to be consistent; wherein the percentage content of the formula is as follows: 47.5-49.3 parts of ferric oxide; 17.5-28 parts of nickel oxide; 20-26.5 parts of zinc oxide; copper oxide: 0-15.

A galvanizing forming method is characterized in that: the method comprises the following specific steps:

a. mixing the raw materials using the formulation of claim 1 to ensure that the shrinkage and sintering temperatures of the materials remain consistent;

b. molding: the method adopts a two-step molding mode, one part of the magnetic core is molded by manganese zinc, and the other part of the magnetic core is molded by nickel zinc

c. And (3) sintering: the valence change of iron and manganese is controlled by controlling the atmosphere.

Wherein a direct dependence of the equilibrium sintering oxygen partial pressure on the ferrite formulation and the required Fe content of the ferrite is theoretically and experimentally revealed from a general equilibrium atmosphere diagram for ferrite sintering. The control of the equilibrium oxygen partial pressure is set according to a Blank equilibrium atmosphere calculation formula:

lg(P(O²))：a-b/T

in the formula, P (0)²) Where b is a constant, the partial pressure of oxygen, and b is typically 14540, absolute temperature. In order to have more intuitive understanding on the Blank equilibrium atmosphere formula, a and b are respectively changed to draw equilibrium atmosphere diagrams.

(1) Keeping b 14540, changing a from 7.2 to 8.4, the equilibrium atmosphere diagram is shown in fig. 1. It can be seen that a change in value a results in a change in the oxygen partial pressure throughout the temperature interval and increases substantially equidistantly in logarithmic scale. The smaller the value of a, the lower the oxygen partial pressure at the corresponding temperature, the more the oxygen partial pressure is in the reducing atmosphere, the more Fe2+ ions are in the sintered body, and the lower the two-peak temperature is; conversely, a higher value corresponds to a higher oxygen partial pressure at temperature, which is more biased toward an oxidizing atmosphere, and a higher temperature of the two peaks.

(2) Keeping the oxygen partial pressure at 1320 ℃ constant, changing the b value from 11000 to 19000, calculating the corresponding a value according to the oxygen partial pressure at 1320 ℃, and obtaining the equilibrium atmosphere diagram as shown in figure 2. It can be seen that the larger the value of b, the lower the oxygen partial pressure in the cooling section, i.e. the more biased the reducing atmosphere; the smaller the value, the higher the oxygen partial pressure in the cooling section, i.e. the more oxidizing atmosphere.

According to the invention, by adjusting the formula of the nickel-zinc material and the formula of the manganese-zinc material, the sintering shrinkage rate and the sintering temperature of the nickel-zinc material and the manganese-zinc material are consistent and are between 1200-1300 ℃, and meanwhile, the raw materials are sintered by adopting a controlled atmosphere, so that the raw materials can be used as a nickel-zinc ferrite product.

Drawings

FIG. 1 is a schematic structural view of the present invention;

Detailed Description

The invention is described in further detail below with reference to the figures and specific embodiments.

As shown in fig. 1, a nickel zinc ferrite formulation according to a preferred embodiment of the present invention is characterized in that: the method is used for enabling the sintering shrinkage rate and the sintering temperature of the nickel-zinc material to be consistent; wherein the percentage content of the formula is as follows: 47.5-49.3 parts of ferric oxide; 17.5-28 parts of nickel oxide; 20-26.5 parts of zinc oxide; copper oxide: 0-15.

A galvanizing forming method is characterized in that: the method comprises the following specific steps:

a. mixing the raw materials using the formulation of claim 1 to ensure that the shrinkage and sintering temperatures of the materials remain consistent;

b. molding: the method adopts a two-step molding mode, one part of the magnetic core is molded by manganese zinc, and the other part of the magnetic core is molded by nickel zinc

c. And (3) sintering: the valence change of iron and manganese is controlled by controlling the atmosphere.

Wherein a direct dependence of the equilibrium sintering oxygen partial pressure on the ferrite formulation and the required Fe content of the ferrite is theoretically and experimentally revealed from a general equilibrium atmosphere diagram for ferrite sintering. The control of the equilibrium oxygen partial pressure is set according to a Blank equilibrium atmosphere calculation formula:

lg(P(O²))：a-b/T

in the formula, P (0)²) Where b is a constant, the partial pressure of oxygen, and b is typically 14540, absolute temperature. In order to have more intuitive understanding on the Blank equilibrium atmosphere formula, a and b are respectively changed to draw equilibrium atmosphere diagrams.

(1) Keeping b 14540, changing a from 7.2 to 8.4, the equilibrium atmosphere diagram is shown in fig. 1. It can be seen that a change in value a results in a change in the oxygen partial pressure throughout the temperature interval and increases substantially equidistantly in logarithmic scale. The smaller the value of a, the lower the oxygen partial pressure at the corresponding temperature, the more the oxygen partial pressure is in the reducing atmosphere, the more Fe2+ ions are in the sintered body, and the lower the two-peak temperature is; conversely, a higher value corresponds to a higher oxygen partial pressure at temperature, which is more biased toward an oxidizing atmosphere, and a higher temperature of the two peaks.

(2) Keeping the oxygen partial pressure at 1320 ℃ unchanged, changing the value b from 11000 to 19000, calculating the corresponding value a according to the oxygen partial pressure at 1320 ℃, wherein the larger the value b is, the lower the oxygen partial pressure at the cooling section is, namely, the more the reducing atmosphere is; the smaller the value, the higher the oxygen partial pressure in the cooling section, i.e. the more oxidizing atmosphere.

According to the invention, by adjusting the formula of the nickel-zinc material and the formula of the manganese-zinc material, the sintering shrinkage rate and the sintering temperature of the nickel-zinc material and the manganese-zinc material are consistent and are between 1200-1300 ℃, and meanwhile, the raw materials are sintered by adopting a controlled atmosphere, so that the raw materials can be used as a nickel-zinc ferrite product.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any minor modifications, equivalent replacements and improvements made to the above embodiment according to the technical spirit of the present invention should be included in the protection scope of the technical solution of the present invention.