CN102010192B - Mangan zinc ferrite resintering process - Google Patents

Mangan zinc ferrite resintering process Download PDF

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CN102010192B
CN102010192B CN 201010527186 CN201010527186A CN102010192B CN 102010192 B CN102010192 B CN 102010192B CN 201010527186 CN201010527186 CN 201010527186 CN 201010527186 A CN201010527186 A CN 201010527186A CN 102010192 B CN102010192 B CN 102010192B
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CN102010192A (en
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黄伟
李良俊
石庆辉
段树彬
胡健
李文庆
徐晓利
陈兴贵
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YIBIN JINCHUAN ELECTRONICS CO Ltd
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Abstract

The invention relates to a mangan zinc ferrite resintering process. A superoxidized mangan zinc ferrite ripe blank product is put into a kiln for heating, wherein the atmosphere is air or nitrogen atmosphere at the temperature of between room temperature and 500 DEG C, is nitrogen atmosphere at the temperature of between 500 and 900 DEG C, and is balanced oxygen partial pressure or weakly reducing atmosphere at the temperature of above 900 DEG C on the premise that the product is not cracked; and the lowest keeping temperature for resintering is 1,000 DEG C, and the highest temperature is the temperature at which a raw blank of the product is sintered and is kept for 0.5 to 3 hours, and a heat preservation period atmosphere and a temperature reduction process can be controlled according to the conventional sintering process. By the implementation of the process, a mangan zinc ferrite waste product of which the surface color is abnormal due to oxidation is converted into a product of which the surface color is normal. Meanwhile, a product with ultralong size due to low primary sintering temperature or short temperature keeping time can be changed into a product of the normal size and surface color after being resintered.

Description

A kind of Mangan zinc ferrite resintering process
Technical field
The present invention relates to a kind of magnetic materials production technique, particularly a kind of Mangan zinc ferrite resintering process.
Background technology
Mn-Zn ferrite is by MnO-ZnO-Fe 2O 3Three kinds of complex ferrites that main component forms.MnZn ferrite material has the characteristics such as magnetic permeability height, saturation magnetic flux density is high, loss is low, is widely used in the fields such as household electrical appliance, network communication, automotive electronics, aerospace.
In traditional sintering process process, the Mn-Zn ferrite green compact are placed the kiln high temperature sintering, be broadly divided into temperature rise period, holding stage and temperature-fall period.In the temperature rise period, be the binder removal section from room temperature-600 ℃ (particularly 200-400 a ℃), heat-up rate is slower, V-bar is not higher than 100 ℃/h, and 600-900 ℃ heat-up rate is very fast, and average heating speed is 150-250 ℃/h, 900-1100 ℃ of blank shrinks larger, heat-up rate is unsuitable too fast, and average heating speed is 100-200 ℃/h, and the average heating speed of 1100 ℃-sintering temperature is 200-300 ℃/h.Sintering temperature is 1100-1400 ℃, there are differences because material character and product service requirements are different, as being used for 300kHz and following power ferrite, sintering temperature is generally 1300-1400 ℃, be used for the above power ferrite of 300kHz, sintering temperature is generally 1200-1300 ℃, and the sintering temperature of high magnetic conductivity ferrite is generally about 1400 ℃.Holding stage, the time is generally 3-6h, and it is 10-15h's that the soaking time of report sintering superhigh magnetic conductivity Mn-Zn ferrite is also arranged.At temperature-fall period, average cooling rate is generally 100-200 ℃/h.If speed of cooling is too fast, can causes the blank cracking, or cause internal stress in blank inside, so that the degradation of product.
[0004]The general air atmosphere environment that adopts of temperature rise period is perhaps controlled oxygen level less than 0.2% volume at 900-1100 ℃, and the sintering atmosphere of holding stage and temperature-fall period needs control, usually adopts the equilibrium oxygen partial pres-sure pattern to control.Through the formed Mn-Zn ferrite of high temperature sintering, if the oxygen partial pressure in the surrounding atmosphere is higher than the oxygen decomposition pressure of product, will be so that the oxygen in the surrounding atmosphere enters product, cause the product oxygen uptake, oxidizing reaction namely occurs, otherwise then put oxygen, reduction reaction namely occurs.Oxygen partial pressure (Po when surrounding atmosphere 2) suitably the time, oxide compound and ferrite neither oxidation do not reduce yet, the oxygen that absorbs in other words equates with the oxygen of emitting, and is in chemistry balance state, oxygen partial pressure at this moment just is called equilibrium oxygen partial pres-sure.The equilibrium oxygen partial pres-sure of Mn-Zn ferrite and the relation of temperature can be represented by the formula:
log(Po 2)?=?-A/T+B
In the formula, Po 2It is the pressure component of oxygen under 1 atmospheric pressure.Because Mn-Zn ferrite is generally produced in tunnel furnace or clock hood type furnace, the product ambient pressure is a little more than ambient atmosphere pressure, and therefore, oxygen content is similar to oxygen partial pressure value in the atmosphere, and the oxygen level by the test sintering atmosphere in the production represents oxygen partial pressure.A, B are constant, and be relevant with material prescription and product performance requirement, and generally speaking, the span of A is 13000-15000, and the span of B is 7-10.T is the absolute temperature of product, unit K.
Usually, in the sintering process of Mn-Zn ferrite, in the very not serious situation of the oxidation of system and iuvenescence, although appraising at the current rate or the room occurring of metal ion can appear, their can solid solution in original mutually in, still keep single-phase.If but serious oxidation and iuvenescence appear in system, Mn-Zn ferrite is oxidized with reduction and precipitation is separated out other mutually, and meeting is so that the degradation of Mn-Zn ferrite.Owing to only under the strongly reducing atmosphere condition, just have Mn in the Mn-Zn ferrite 2+And Fe 2+Be reduced into Mn and exist with other form mutually with the Fe metal, and sintering atmosphere is nitrogen and air mixed, generally can not form strongly reducing atmosphere, therefore, does not relate to the over reduction problem.
[0006]In the sintering process of Mn-Zn ferrite, a series of solid state reactions will occur.The solid state reaction of Mn-Zn ferrite can be divided into Mn ferrite and two the solid state reaction processes of Zn ferrite of generating, and the Mn ferrite of generation and Zn ferrite at high temperature mutual solid solution just obtain Mn-Zn ferrite.Through the formed Mn-Zn ferrite of high temperature sintering, along with the reduction of temperature, the oxygen decomposition pressure in the product descends, if the oxygen partial pressure in the surrounding atmosphere is higher than the oxygen decomposition pressure of product, will so that the oxygen in the surrounding atmosphere enters product, cause the product oxygen uptake.When Mn-Zn ferrite cooled off in oxidizing atmosphere, the chemical transformation that can occur was as follows:
(1) temperature is more than 1100 ℃, when oxygen partial pressure is larger in the surrounding atmosphere, and MnFe 2O 4In some divalent manganesetion be oxidized to Manganic ion.γ-Mn appears in the result 3O 4, γ-Fe also appears simultaneously 2O 3Its reaction is:
4MnFe 2O 4?+?[O]?→?MnFe 2O 4·γ-Mn 3O 4·3γ-Fe 2O 3
Because the γ-Mn that generates 3O 4And γ-Fe 2O 3All be face-centred cubic structure, they can solid solution form sosoloid in ferrite, still be single-phase, and are little to the performance impact of material.
(2) temperature drops in the 1100-1000 ℃ of scope, when oxygen partial pressure is larger in the surrounding atmosphere, and MnFe 2O 4In divalent manganesetion continue to be oxidized to Manganic ion.In this temperature range, the γ-Mn with face-centred cubic structure of solid solution in ferrite 3O 4Isomeric transition occurs become the β-Mn with tetragonal 3O 4Because β-Mn 3O 4Different from the Spinel structure, β-Mn 3O 4Will from sosoloid, out exist mutually with other by precipitation.Its reaction is:
MnFe 2O 4·γ-Mn 3O 4·γ-Fe 2O 3?→?MnFe 2O 4·γ-Fe 2O 3?+?β-Mn 3O 4
Owing to β-Mn occurred 3O 4Phase can cause lattice distortion in addition, and is larger on the product performance impact.
(3) when temperature continues to drop to 950 ℃ of left and right sides, larger such as oxygen partial pressure in the surrounding atmosphere, MnFe 2O 4In divalent manganesetion continue to be oxidized to Manganic ion.In addition, β-Mn 3O 4Be oxidized to the α-Mn with body-centered cubic structure because of oxygen uptake 2O 3, namely
2β-Mn 3O 4?+?[O]?→?3α-Mn 2O 3
Because α-Mn 2O 3Have body-centered cubic structure, also will exist mutually with other, this will exert an influence to the performance of Mn-Zn ferrite.
(4) when temperature continues to drop to 600 ℃ of left and right sides, larger such as oxygen partial pressure in the surrounding atmosphere, MnFe 2O 4In divalent manganesetion also can be oxidized to Manganic ion, but since temperature lower, oxidation rate slows down.Solid solution is in MnFe 2O 4In the γ-Fe with face-centred cubic structure 2O 3Isomeric transition occurs become the α-Fe with rhombohedron structure 2O 3Because α-Fe 2O 3Structure different from the Spinel structure, understand precipitation equally and out exist mutually with other.Its reaction is:
MnFe 2O 4·γ-Fe 2O 3?→?MnFe 2O 4?+?α-Fe 2O 3
These α-Fe 2O 3With front precipitation α-Mn out 2O 3Form the in the form of sheets sosoloid α of tissue-(Fe 2O 3Mn 2O 3), be mixed in the crystal grain of Spinel, very large to the performance impact of material.
(5) in the time of in system temperature drops to 300-250 ℃ of scope, a large amount of α-Fe 2O 3To form in addition phase of needle-like, have a strong impact on the Mn-Zn ferrite product performance.
As known from the above, in the Mn-Zn ferrite of in peroxidation atmosphere, lowering the temperature, produce α-Mn 2O 3And α-Fe 2O 3The phase precipitation is to cause that the unusual major cause of surface color appears in product in addition.Because the peroxidation degree is different, its surface color is also different, the blueing that has, and the general purple that has, what have is general red.
[0017] in long-term production process, sometimes because fault causes the kiln afterbody to enter air, or owing to reasons such as nitrogen gas purity reductions, cause product over oxidation in temperature-fall period, it is unusual to be embodied in surface color.Traditional treatment process is that these products are processed as bad product or scrap products, brings financial loss to enterprise, causes the wasting of resources to society.
Summary of the invention
The purpose of this invention is to provide a kind of Mangan zinc ferrite resintering process, excessive during with first sintering
The bad product of oxidation is reduced into qualified product again through returning burning.
The object of the present invention is achieved like this, and a kind of Mangan zinc ferrite resintering process places kiln to heat the ripe base product of Mn-Zn ferrite of over oxidation, average heating speed 200-300 ℃/h, do not produce cracking as prerequisite take product.Because redox reaction in the larger atmosphere of oxygen partial pressure, will occur about 600 ℃ in Mn-Zn ferrite, therefore need controlled atmosphere, product is in the lower oxygen partial pressure atmosphere, thereby suppresses the oxidizing reaction in the product, promote the reduction of Manganic ion.Concrete operations are exactly to be air or nitrogen atmosphere from room temperature to 500 ℃, rise to from 500 ℃ to be nitrogen atmosphere 900 ℃ of processes, and be equilibrium oxygen partial pres-sure or weakly reducing atmosphere more than 900 ℃.Return minimum 1000 ℃ of the holding temperature of burning, be up to the temperature of product green sintering, soaking time is 0.5-3h, and holding stage atmosphere and temperature reduction technology can be controlled by conventional sintering technique.
For snperoxiaized Mn-Zn ferrite, owing to be in the low oxygen partial pressure atmosphere in the temperature-rise period, opposite chemical transformation when occuring with oxidation, its process is:
(1) when temperature is raised to 250 ℃ of left and right sides, the acicular α-Fe in the product 2O 3Become sheet.
(2) when temperature is raised to 600 ℃ of left and right sides, α-Fe 2O 3Isomeric transition occurs become γ-Fe 2O 3, its reaction is: α-Fe 2O 3→ γ-Fe 2O 3
(3) when temperature is raised to 950 ℃ of left and right sides, α-Mn 2O 3Put oxygen and be reduced to β-Mn 3O 4, i.e. 3 α-Mn 2O 3→ 2 β-Mn 3O 4+ [O]
(4) when temperature is raised to 1000 ℃ of left and right sides, β-Mn 3O 4Isomeric transition occurs become γ-Mn 3O 4, i.e. β-Mn 3O 4→ γ-Mn 3O 4, and γ-Mn 3O 4Be face-centred cubic structure, can with γ-Fe 2O 3Form sosoloid.Mn 3O 4Can regard Mn as again 2O 3MnO facilitates and Fe like this 2O 3Reaction generates MnFe 2O 4Concrete reaction is: Mn 3O 4+ Fe 2O 3→ MnFe 2O 4+ Mn 2O 3The Mn that reaction is remaining 2O 3Again can deoxidation changes Mn into because being in 1000 ℃ high temperature 3O 4Newly-generated Mn 3O 4Again with Fe 2O 3React and generate MnFe 2O 4, so circulation is until total overall reaction generates MnFe 2O 4Temperature-fall period adopts traditional technology, and atmosphere is controlled by equilibrium oxygen partial pres-sure basically, has prevented the generation of peroxidation phenomenon.
Owing to produce α-Mn in the Mn-Zn ferrite of over oxidation 2O 3And α-Fe 2O 3Again formed MnFe 2O 4, so its surface color improves, simultaneously, because other is eliminated mutually, so product performance have also obtained improvement to a certain degree.
For reducing the volatile quantity of zinc and growing up of crystal grain, to select the lower soaking time of returning the burning temperature and lacking as good.
Owing to return in the burning process, the chemical reactions such as redox not only can occur in product, the physical reaction that is attended by simultaneously the further densification of product exists, and particularly returns and burns in the situation that temperature is higher, soaking time is long, returns the apparent size of product after burning and has reducing to a certain degree.
By implementing the present invention, can will change the normal product of surface color into because of the unusual Mn-Zn ferrite waste product of oxidation surface color.Simultaneously, also can make low because of first sintering temperature or the short product that the size overlength occurs of soaking time after returning burning, become the normal product of size and surface color.
Embodiment
Below in conjunction with example, the present invention is described further:
Embodiment one:
Place kiln to heat the unusual Mn-Zn ferrite product of first sintering over oxidation surface color, average heating speed is 200 ℃/h, rise to 500 ℃ from room temperature and be air atmosphere, 500-900 ℃ is nitrogen atmosphere (oxygen level≤0.02%), and 900 ℃-1000 ℃ oxygen level is controlled by following formula:
log(Po 2) T?=?log(Po 2) 1?+?[log(Po 2) 1?-?log(Po 2) 2](T-900)/100
In the formula, log (Po 2) TOxygen partial pressure during for temperature T, log (Po 2) 1Oxygen when being 900 ℃ divides
Press (0.01%) log (Po 2) 2Oxygen partial pressure when being 1000 ℃ (0.2%), T is temperature, unit ℃.The first sintering temperature of this product is 1360 ℃, and top temperature is 1000 ℃ when returning burning, reaches 1000 ℃ and enters holding stage, and soaking time is 0.5h, and the holding stage oxygen level is set to 0.2%.Temperature-fall period adopts conventional sintering technique to control, and the product surface color was normal after cooling was finished, and obtained qualified Mn-Zn ferrite product, and the product design size through returning burning does not change substantially.
Embodiment two:
Place kiln to heat the unusual Mn-Zn ferrite product of first sintering over oxidation surface color, average heating speed is 300 ℃/h, rise to 500 ℃ from room temperature and be air atmosphere, 500-900 ℃ is nitrogen atmosphere (oxygen level≤0.02%), the first sintering temperature of this product is 1360 ℃, and top temperature is similarly 1360 ℃ when returning burning, and is identical with this product green sintering temperature, soaking time is 3h, and the holding stage oxygen level is 7.5%.900-1360 ℃ oxygen level is controlled by following formula:
log(Po 2) T?=?log(Po 2) 1?+?[log(Po 2) 1?-?log(Po 2) 2](T-900)/460
In the formula, log (Po 2) TOxygen partial pressure when being T for temperature, log (Po 2) 1Oxygen partial pressure when being 900 ℃ for temperature (0.01%), log (Po 2) 2Oxygen partial pressure when being 1360 ℃ (7.5%), T is temperature, unit ℃.Temperature-fall period adopts conventional sintering technique to control, the product surface color was normal after cooling was finished, obtain qualified Mn-Zn ferrite product, product design size foreign minister through returning burning becomes 28.30mm by 28.54mm, width becomes 11.94mm by 12.04mm, center pillar becomes 7.44mm by 7.50mm, has dwindled about 0.8%.
Embodiment three:
Place kiln to heat the unusual Mn-Zn ferrite product of first sintering over oxidation surface color, average heating speed is 200 ℃/h, rise to 500 ℃ from room temperature and be air atmosphere, 500-900 ℃ is nitrogen atmosphere (oxygen level≤0.02%), the first sintering temperature of this product is 1360 ℃, top temperature is 1100 ℃ when returning burning, and soaking time is 0.5h, and the holding stage oxygen level is 0.5%.900-1100 ℃ oxygen level is controlled by following formula:
log(Po 2) T?=?log(Po 2) 1?+?[log(Po 2) 1?-?log(Po 2) 2](T-900)/200
In the formula, log (Po 2) TOxygen partial pressure when being T for temperature, log (Po 2) 1Oxygen partial pressure when being 900 ℃ for temperature (0.01%), log (Po 2) 2Oxygen partial pressure when being 1100 ℃ (0.5%), T is temperature, unit ℃.Temperature-fall period adopts conventional sintering technique to control, the product surface color was normal after cooling was finished, obtain qualified Mn-Zn ferrite product, product design size foreign minister through returning burning becomes 28.54mm by 28.56mm, width becomes 12.04mm by 12.04mm, center pillar becomes 7.50mm by 7.50mm, and product size changes very little.
Embodiment four:
Place kiln to heat the unusual Mn-Zn ferrite product of first sintering over oxidation surface color, average heating speed is 320 ℃/h, rise to 900 ℃ from room temperature and be nitrogen atmosphere (oxygen level≤0.02%), the first sintering temperature of this product is 1360 ℃, top temperature is 1100 ℃ when returning burning, soaking time is 1h, and the holding stage oxygen level is 0.5%.900-1100 ℃ oxygen level is controlled by following formula:
log(Po 2) T?=?log(Po 2) 1?+?[log(Po 2) 1?-?log(Po 2) 2](T-900)/200
In the formula, log (Po 2) TOxygen partial pressure when being T for temperature, log (Po 2) 1Oxygen partial pressure when being 900 ℃ for temperature (0.01%), log (Po 2) 2Oxygen partial pressure when being 1100 ℃ (0.5%), T is temperature, unit ℃.Temperature-fall period adopts conventional sintering technique to control, the product surface color was normal after cooling was finished, obtain qualified Mn-Zn ferrite product, product design size foreign minister through returning burning becomes 28.52mm by 28.54mm, width becomes 12.02mm by 12.04mm, center pillar becomes 7.50mm by 7.50mm, and product size changes less.

Claims (1)

1. Mangan zinc ferrite resintering process, it is characterized in that: place kiln to heat the unusual Mn-Zn ferrite product of first sintering over oxidation surface color, average heating speed is 200 ℃/h, rise to 500 ℃ from room temperature and be air atmosphere, 500-900 ℃ is nitrogen atmosphere, the oxygen level that oxygen level≤0.02%, 900 is ℃-1000 ℃ is controlled by following formula: log (Po 2) T=log (Po 2) 1+ [log (Po 2) 1-log (Po 2) 2] (T-900)/100, in the formula, log (Po 2) TOxygen partial pressure during for temperature T, log (Po 2) 1Oxygen partial pressure 0.01% when being 900 ℃, log (Po 2) 2Oxygen partial pressure 0.2% when being 1000 ℃, T is temperature, unit ℃, and the first sintering temperature of this product is 1360 ℃, top temperature is 1000 ℃ when returning burning, reach 1000 ℃ and enter holding stage, soaking time is 0.5h, and the holding stage oxygen level is set to 0.2%, temperature-fall period adopts conventional sintering technique to control, the product surface color was normal after cooling was finished, and obtained qualified Mn-Zn ferrite product, and the product design size through returning burning does not change substantially.
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Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102376444B (en) * 2011-08-25 2016-01-20 天长市中德电子有限公司 A kind of sintering method of magnetic core
CN102690122A (en) * 2012-06-05 2012-09-26 宜宾盈泰光电有限公司 Method for remedying rejected manganese-zinc ferrites by using atmosphere heat treatment
CN103467106B (en) * 2013-09-03 2014-12-24 宝钢磁业（江苏）有限公司 Sintering process of ferrite with high magnetic permeability
CN103570363B (en) * 2013-11-13 2015-04-22 宝钢磁业（江苏）有限公司 High-performance power manganese zinc ferrite sintering process
CN104310981B (en) * 2014-10-10 2017-03-29 江苏省晶石磁性材料与器件工程技术研究有限公司 A kind of manganese-zinc ferrite flashes back method
CN106007736A (en) * 2016-05-13 2016-10-12 泰州茂翔电子器材有限公司 Sintering method for high-performance manganese zinc ferrite material
CN107098693B (en) * 2017-04-28 2021-01-19 苏州冠达磁业有限公司 High-frequency anti-interference manganese-zinc ferrite and preparation method thereof
CN112794723B (en) * 2021-01-12 2022-09-02 乳源东阳光磁性材料有限公司 Return firing method of manganese-zinc power ferrite magnetic core
CN113284731B (en) * 2021-05-17 2022-08-02 湖北微硕电子科技有限公司 High-frequency large-magnetic-field soft magnetic ferrite material and preparation method thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1619719A (en) * 2003-11-21 2005-05-25 浙江天通电子股份有限公司 Manganese zinc ferrite soft magnet and its manufacturing method
CN101090016A (en) * 2006-06-14 2007-12-19 横店集团东磁有限公司 Sintering method for high saturated flux density MnZn ferrite
CN101274846A (en) * 2007-03-30 2008-10-01 Tdk株式会社 Method of producing MnZn-base ferrite

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5332254B2 (en) * 2008-03-25 2013-11-06 Ｔｄｋ株式会社 Ferrite sintered body

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1619719A (en) * 2003-11-21 2005-05-25 浙江天通电子股份有限公司 Manganese zinc ferrite soft magnet and its manufacturing method
CN101090016A (en) * 2006-06-14 2007-12-19 横店集团东磁有限公司 Sintering method for high saturated flux density MnZn ferrite
CN101274846A (en) * 2007-03-30 2008-10-01 Tdk株式会社 Method of producing MnZn-base ferrite

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
肖湘泉等.MnZn软磁铁氧体纳米粉末的烧结特性.《磁性材料及器件》.2003,第34卷(第3期),第37-41页. *

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