CN107527732A - A kind of high intensity manganese-zinc ferrite core manufacture method - Google Patents
A kind of high intensity manganese-zinc ferrite core manufacture method Download PDFInfo
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- CN107527732A CN107527732A CN201710320185.8A CN201710320185A CN107527732A CN 107527732 A CN107527732 A CN 107527732A CN 201710320185 A CN201710320185 A CN 201710320185A CN 107527732 A CN107527732 A CN 107527732A
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- magnetic core
- sintering
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- volatilization
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F41/00—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties
- H01F41/02—Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils, or magnets
- H01F41/0206—Manufacturing of magnetic cores by mechanical means
Abstract
The present invention relates to technical field of magnetic materials, more particularly to a kind of high intensity manganese-zinc ferrite core manufacture method.The technical solution adopted by the present invention is：High intensity manganese-zinc ferrite core manufacture method, controlled by a kind of new sintering process, the factor that sintering process influences magnetic core strength character in sintering process mainly has sintering temperature curve and sintering atmosphere curve, due to the volatilization of various materials can occur in manganese-zinc ferrite sintering process, expansion and contraction, solid phase reaction, the physicochemical changes such as redox reaction, the time of origin and degree of these changes can all have different degrees of influence to the internal stress size of magnetic core and distribution, and then have influence on the strength characteristics of magnetic core, by effectively controlling these changes, the magnetic core of high intensity is made.It is an advantage of the invention that：It is higher by magnetic core intensity made from the inventive method, the situation for occurring magnetic core damage in assembling process is avoided, increases stability when service life and the use of magnetic core.
Description
Technical field
The present invention relates to technical field of magnetic materials, more particularly to a kind of high intensity manganese-zinc ferrite core manufacture method.
Background technology
Ferrite is a kind of nonmetal magnetic material using iron oxide as main component, is by iron and other metallic element groups
Into composite oxides, also known as ferromagnetic oxide, magnetic ferrites magnet.
MnZn ferrite material belongs to soft magnetic ferrite, as the important member in magnetic material big family, is made of it
The magnet assembly such as all kinds of electronic transformers, inductor, choke coil and magnetic core in military equipment, modern communicationses, automotive electronics, new
The fields such as the energy, information security, electromagnetism interference and office automation play the effect of key.Enter with the science and technology of modern industry
Step, manganese-zinc ferrite core (hereinafter referred to as magnetic core) and the phenomenon that other magnetic materials are applied in combination are more and more, while progressively
Automated assembly is realized, thus in an assembling process, is inevitably fixed using fixture, and to the fastening force of magnetic core
It is bigger, thus higher requirement is proposed to the strength characteristics aspect of magnetic core, to avoid the occurrence of the magnetic core in assembling process
Damage.
The content of the invention
It is an object of the invention to provide a kind of high intensity manganese-zinc ferrite core manufacture method, for the iron oxygen of phase same material
Body powder is controlled to obtain the magnetic core of higher intensity after overmolding by a kind of new sintering process.
Technical scheme is as follows：
By theory analysis and the experience of manufacture magnetic core in the past, want to obtain the magnetic core of high intensity it is necessary to controlling magnetic core
Internal stress size and its uniformity of distribution, it is critically depend on ferrite powder and the shaping in magnetic core manufacture and agglomerant
Skill.
A kind of high intensity manganese-zinc ferrite core manufacture method, controlled by a kind of new sintering process, the new burning
The factor that knot technique influences magnetic core strength character in sintering process mainly has sintering temperature curve and sintering atmosphere curve, described
New sintering process mainly includes the following steps that in sintering process：(1) the different sintering temperature regions of corresponding magnetic core are set
Different heating rate, to reduce magnetic core internal stress and be allowed to be distributed in magnetic core inner homogeneous；(2) on heating rate and atmosphere
Targetedly designed, fully ensure that the volatilization of volatile matter, avoided to ferrite crystal undergrowth, cause the interior of magnetic core
Stress increases and uneven distribution, and then has influence on the intensity of magnetic core；(3) controlled in heating region by improving heating rate
The volatilization of zinc in the magnetic core sintering temperature rise period, ensures the integrality of magnetic core crystal structure, while (is given low using densification means
Oxygen content) control the speed of growth of magnetic core crystal grain, while reduce sintering temperature, reduce the internal stress of magnetic core；(4) in constant temperature
Region, the appropriate method for reducing sintering temperature and reducing constant temperature time is taken, crystal grain thinning, reduces the space in crystal structure；
(5) when cooling 1100~900 DEG C of scopes in region, exist Zn-ef ficiency from Mn-Zn ferrite crystal structure dissociate volatilization can
Can, suitable oxygen content is given in atmosphere, while accelerate cooling rate, shortens magnetic core in the residence time of this temperature section,
To reduce in ferrite crystal structure because the internal stress that lattice defect caused by the missing of Zn-ef ficiency triggers increases and uneven
Distribution；(6) after being cooled to 450 DEG C, slow down rate of temperature fall, until room temperature, to control due to magnetic core inside and outside temperature difference
Caused internal stress, sintering out kilneye connecting portion in outside track and the magnetic core of sintering kiln increases by 3~5m stay-warm case, with
Rate of temperature fall of the magnetic core at 180 DEG C after kiln discharge is controlled, avoids cooling rate too fast.
Further, by controlling heating rate, and in 900 DEG C/hr or so, the size insulation 1~2 depending on magnetic core is small
When, that is, give the impurity enough volatilization time, so as to promote the volatilization of impurity.
Further, by increasing air inlet and the rate of air sucked in required of the temperature province, the impurity concentration in sintering oven is reduced, so as to
Promote the volatilization of impurity.
Beneficial effects of the present invention：
It is higher by magnetic core intensity made from the inventive method, avoid the feelings for occurring magnetic core damage in assembling process
Condition, increase stability when service life and the use of magnetic core.
Brief description of the drawings
Fig. 1 is sintering temperature, atmosphere curve comparison diagram；
Fig. 2 is M method test schematic diagrams；
Fig. 3 is F method test schematic diagrams；
Embodiment
In sintering process, the factor for influenceing magnetic core strength character mainly has sintering temperature curve and sintering atmosphere curve,
Usual sintering temperature curve is divided into dumping area, trash zone, heating zone, heat preservation zone and cooling area, because manganese-zinc ferrite is sintered
The various physicochemical changes such as volatilization, expansion and the contraction of various materials, solid phase reaction, redox reaction occur for Cheng Zhonghui,
And the time of origin and degree of these changes can all have different degrees of influence to the internal stress size of magnetic core and distribution, Jin Erying
The strength characteristics to magnetic core is rung, effectively to control these changes, it is necessary to formulates suitable sintering temperature curve and corresponding
Atmosphere curve.
By the different temperatures region of the physicochemical change occurred in serious analysis MnZn ferrite material sintering process,
Creative has formulated sintering temperature curve and atmosphere curve, and the sintering method that table 1 and Fig. 1 are distinguished in this invention leads to current
The contrast of normal sintering method.
Table 1 contrasts situation for the present invention and existing method；
It can be seen that this invention has the characteristics that from the contrast of Fig. 1 and table 1：
(1) by carefully fully analyzing the humidity province that various physicochemical changes occur in Ferrite Material sintering process
Domain, and this kind react the influence to magnetic core intensity, and the different sintering temperature regions of corresponding magnetic core set different heating rates,
To reduce magnetic core internal stress and be allowed to inside magnetic core be uniformly distributed as far as possible, to improve the intensity of magnetic core.
(2) by the research to the volatilization mechanism of various volatile substances in magnetic core sintering process, in heating rate and atmosphere
It is upper targetedly to be designed, the volatilization of volatile matter is fully ensured that, avoids to ferrite crystal undergrowth, causes magnetic core
Internal stress increases and uneven distribution, and then has influence on the intensity of magnetic core.This invention is taken for impurity volatilization temperature region
The measure of two aspects promotes the volatilization of impurity, on the one hand controls heating rate, and in 900 DEG C/hr or so, depending on magnetic core
Size be incubated 1~2 hour, that is, give the impurity enough volatilization time, on the other hand by increasing the air inlet of the temperature province
With rate of air sucked in required, the impurity concentration in sintering oven is reduced, promotes the volatilization of impurity.
(3) control magnetic core to sinter the volatilization of zinc in the temperature rise period by improving heating rate in heating region, ensure magnetic
The integrality of core crystal structure, while control the growth of magnetic core crystal grain fast using densification means (giving low oxygen content)
Degree, improves the density of magnetic core, while reduces sintering temperature, reduces the internal stress of magnetic core, improves the intensity of magnetic core.
(4) in constant temperature zone, the appropriate method for reducing sintering temperature and reducing constant temperature time is taken, crystal grain thinning, is reduced
Space in crystal structure, improve the intensity of magnetic core.
(5) cooling 1100~900 DEG C of region in the range of, exist Zn-ef ficiency from Mn-Zn ferrite crystal structure dissociate wave
The possibility of hair, this invention within the range, give higher oxygen content, simultaneously compared with conventional sintering process, in atmosphere
With faster cooling rate, shorten magnetic core in the residence time of this temperature section, to reduce in ferrite crystal structure due to zinc member
The internal stress increase and uneven distribution that lattice defect caused by the missing of element triggers, so as to improve the intensity of magnetic core.
(6) after being cooled to 450 DEG C, low rate of temperature fall is given, until room temperature, to control due to magnetic core inside and outside temperature
Internal stress caused by difference, magnetic core intensity is improved, we sinter out kilneye with magnetic core in the outside track of sintering kiln and connected for this
Socket part position increases by 3~5m stay-warm case, to control rate of temperature fall of the magnetic core at 180 DEG C after kiln discharge, avoids cooling rate too fast.
Table 2 is the sintering Comparative result situation of different magnetic core sintering methods；
The direction of arrow is the iron oxygen of pressure direction, sintering process of the invention and conventional sintering process sintering in Fig. 2 and Fig. 3
Body material property Comparative result is as shown in table 2 below, it should be noted that Ferrite Material use is the same as a batch of MP4B materials, sample
Sample selection PQ49/50 magnetic cores, the molding parameter (weight, size and density) when prepared by magnetic core blank are unanimously, other to exclude
Influence of the parameter to core characteristics.Identical instrument is used when measuring mechanical strength, and is operated by the same tester,
To avoid the error brought due to measurement error to comparative test result.
From table 2 it can be seen that using magnetic core mean intensity made from M methods, the present invention is higher 79.2N than former method, improves
Amplitude wants high 70.8N up to 13.89%, F methods, and increase rate is：10.62%；So use this for same Ferrite Material
The magnetic core intensity that item invention sintering process is sintered acquisition will be higher by much than conventional sintering process.
Described above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, on the premise of principle of the present invention is not departed from, some improvement or replacement can also be made, these improve or replaced
It should be regarded as protection scope of the present invention.
Table 1
Claims (3)
1. a kind of high intensity manganese-zinc ferrite core manufacture method, controlled by a kind of new sintering process, the new sintering
The factor that technique influences magnetic core strength character in sintering process mainly has sintering temperature curve and sintering atmosphere curve, described new
Sintering process mainly included the following steps that in sintering process：(1) the different sintering temperature regions of corresponding magnetic core are set not
Same heating rate, to reduce magnetic core internal stress and be allowed to be distributed in magnetic core inner homogeneous；(2) it is enterprising in heating rate and atmosphere
Row targetedly designs, and fully ensures that the volatilization of volatile matter, avoids the planted agent for ferrite crystal undergrowth, causing magnetic core
Power increases and uneven distribution, and then has influence on the intensity of magnetic core；(3) magnetic is controlled by improving heating rate in heating region
The volatilization of zinc in the core sintering temperature rise period, ensures the integrality of magnetic core crystal structure, while (is given low using densification means
Oxygen content) speed of growth of magnetic core crystal grain is controlled, while sintering temperature is reduced, reduce the internal stress of magnetic core；(4) in flat-temperature zone
Domain, the appropriate method for reducing sintering temperature and reducing constant temperature time is taken, crystal grain thinning, reduces the space in crystal structure；(5)
When cooling 1100~900 DEG C of scopes in region, the possibility of Zn-ef ficiency free volatilization from Mn-Zn ferrite crystal structure be present,
Suitable oxygen content is given in atmosphere, while accelerates cooling rate, shortens magnetic core in the residence time of this temperature section, to reduce
Because the internal stress that lattice defect caused by the missing of Zn-ef ficiency triggers increases and uneven distribution in ferrite crystal structure；
(6) after being cooled to 450 DEG C, slow down rate of temperature fall, until room temperature, to control due to produced by the temperature difference of magnetic core inside and outside
Internal stress, sintering out kilneye connecting portion in outside track and the magnetic core of sintering kiln increases by 3~5m stay-warm case, to control magnetic
Rate of temperature fall of the core at 180 DEG C after kiln discharge, avoids cooling rate too fast.
A kind of 2. high intensity manganese-zinc ferrite core manufacture method according to claim 1, it is characterised in that：Pass through control
Heating rate, and in 900 DEG C/hr or so, the size depending on magnetic core are incubated 1~2 hour, that is, when giving the enough volatilization of impurity
Between, so as to promote the volatilization of impurity.
A kind of 3. high intensity manganese-zinc ferrite core manufacture method according to claim 1, it is characterised in that：Pass through increasing
The air inlet of the temperature province and rate of air sucked in required, the impurity concentration in sintering oven is reduced, so as to promote the volatilization of impurity.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113321515A (en) * | 2021-05-21 | 2021-08-31 | 洛阳中赫非晶科技有限公司 | Sintering process for ferrite magnetic core |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1402265A (en) * | 2002-09-13 | 2003-03-12 | 无锡晶石磁性电子器件有限公司 | Manganese-zinc ferrite magnetic core mfg. method |
| CN201081539Y (en) * | 2007-08-02 | 2008-07-02 | 谢永球 | Butterfly type power saving oven |
| CN102376444A (en) * | 2011-08-25 | 2012-03-14 | 天长市中德电子有限公司 | Magnetic core sintering method and device |
| CN104392837A (en) * | 2014-10-31 | 2015-03-04 | 湖州南浔嘉科电子科技有限公司 | Production method of manganese-zinc ferrite magnetic core |
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2017
- 2017-05-08 CN CN201710320185.8A patent/CN107527732A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1402265A (en) * | 2002-09-13 | 2003-03-12 | 无锡晶石磁性电子器件有限公司 | Manganese-zinc ferrite magnetic core mfg. method |
| CN201081539Y (en) * | 2007-08-02 | 2008-07-02 | 谢永球 | Butterfly type power saving oven |
| CN102376444A (en) * | 2011-08-25 | 2012-03-14 | 天长市中德电子有限公司 | Magnetic core sintering method and device |
| CN104392837A (en) * | 2014-10-31 | 2015-03-04 | 湖州南浔嘉科电子科技有限公司 | Production method of manganese-zinc ferrite magnetic core |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113321515A (en) * | 2021-05-21 | 2021-08-31 | 洛阳中赫非晶科技有限公司 | Sintering process for ferrite magnetic core |
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Application publication date: 20171229 |