CN103342562B - Sintering process of magnesium-iron ferrite small magnetic core - Google Patents
Sintering process of magnesium-iron ferrite small magnetic core Download PDFInfo
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- CN103342562B CN103342562B CN201310279176.0A CN201310279176A CN103342562B CN 103342562 B CN103342562 B CN 103342562B CN 201310279176 A CN201310279176 A CN 201310279176A CN 103342562 B CN103342562 B CN 103342562B
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Abstract
The invention discloses a sintering process of a magnesium-iron ferrite small magnetic core. The sintering process comprises the following steps of: (1), paving a layer of powder which is the same in material as that of blank pieces of the magnesium-iron ferrite small magnetic core on a setter plate, stacking the blank pieces of the magnesium-iron ferrite small magnetic core, and burying the blank pieces of the magnesium-iron ferrite small magnetic core by using the powder which is the same in material as that of the blank pieces; (2), sintering the blank pieces of the magnesium-iron ferrite small magnetic core, which are processed in the step (1), in a kiln and sintering; and (3), placing the sintered product in a vibrating-grinding machine for vibrating and grinding, ultrasonically cleaning, and placing for more than 24 hours to obtain the magnesium-iron ferrite small magnetic core. The sintering process of the magnesium-iron ferrite small magnetic core disclosed by the invention is suitable for sintering the magnesium-iron ferrite small magnetic core with the dimension smaller than 10mm, capable of effectively preventing the small magnetic core from being deformed and twisted in a high-temperature sintering process and capable of effectively preventing zinc replacement with the setter plate, so that the rate of finished products is 95% or higher.
Description
Technical field
The invention belongs to the supplement production technique that manganese-zinc ferrite core manufactures, relate to the little magnetic core sintering process of a kind of Mn-Zn ferrite specifically.
Background technology
Integrated along with electronic product, miniaturization, transformer does less and less, and corresponding magnetic core product also does less and less.In miscellaneous goods production process, because powder consumption is few, unit price is high, and profit is high, and its prime cost is on manual sorting man-hour.Generally, more bigger product can pass through automatic blank arranging machine, and automatic finisher operates; And some products little especially, as length dimension is less than the product of 5mm, automatic blank arranging machine cannot be adopted to operate.Reason has two: 1, magnetic core is too little, and automatic blank arranging machine precision is inadequate; 2, little blank, because density is low, more open, the fragile blank of automatic blank arranging machine mechanical work.And design is specifically designed to High Precision Automatic row's base machine of miscellaneous goods, cost is too high.
Ordinary operation mode adopts burnt in a heap usually, but miscellaneous goods is too small, magnetic core yielding distortion during high temperature burnt in a heap, and simultaneously and hold and burn resistance to material and contact, miscellaneous goods is held the resistance to material component of burning to be affected greatly, holds the resistance to material of burning and is generally AL
2o
3, can produce replacement(metathesis)reaction with the zinc in Mn-Zn ferrite, the product therefore contacted with resistance to material, electrical property sharply worsens.
Summary of the invention
The object of the invention is to solve magnetic core yielding distortion when the little magnetic core of existing Mn-Zn ferrite adopts sintering burnt in a heap and with the problem that load bearing board generation zinc is replaced, provide a kind of Mn-Zn ferrite little magnetic core sintering process.
It is as follows that the present invention realizes the technical scheme that above-mentioned purpose adopts;
The little magnetic core sintering process of a kind of Mn-Zn ferrite, comprises the steps,
1) on load bearing board, first spread one deck powder identical with the blank material of the little magnetic core of Mn-Zn ferrite, then stack the little magnetic core blank of Mn-Zn ferrite, then with the powder identical with blank material, little for Mn-Zn ferrite magnetic core blank is buried;
2) the little magnetic core blank of Mn-Zn ferrite through step 1) process is sintered in kiln;
3) after sintering, products obtained therefrom is placed in vibrating ball mill vibration, then through ultrasonic cleaning, places more than 24 hours, namely obtain the little magnetic core of Mn-Zn ferrite.
Sintering process of the present invention is applicable to the high high-conductive manganese-zinc ferrite product of the sintering of size at the little magnetic core of the Mn-Zn ferrite of below 10mm, particularly, zinc content high for sintering temperature.Effectively can prevent little magnetic core from distorting when high temperature sintering, and replace with the zinc that load bearing board occurs, yield rate can reach more than 95%.
Embodiment
Below in conjunction with embodiment, the present invention is described in further details.
Embodiment 1
Technique routinely, the little magnetic core blank forming of Mn-Zn ferrite, for commercial H4.5 × 2.7 × 1.3-JR10K product.
Holding the powder burning resistance to material upper berth one deck and the equal material of Mn-Zn ferrite little magnetic core blank before stacking, then blank is being deposited on powder; Because product is very little, the load bearing board of product (1 ~ 50,000) the use standard 310 × 310 of every order of classes or grades at school can to put; Again the powder with the equal material of blank is sprinkling upon above blank after heap discharges, spreads some more, blank is buried.
Sintering: will the load bearing board of powder and blank be piled with, hold on kiln, normally sinter.
Vibration: the product after sintering, surface can attach some powder fine particles.Need by vibrating ball mill, the burr of the powder on its surface and shaping generation is removed.Because the magnetic core after sintering is very hard, vibration can not damage magnetic core.
Product after vibration, after ultrasonic cleaning, is placed more than 24 hours, eliminates the stress that vibration produces.Magnet ring series products, can use automatic test machine, delivery after test; The products such as conventional UF type, EE type can use automatic finisher, and grind processing after arrangement, as without finishing rolls, because magnetic core is not fragile, manual operations is also passable, and just efficiency is lower slightly.
Product inductance value is at 0.4 ~ 0.7uH, and nothing is out of shape, conforming product rate less than 95%.
contrast experiment
With sintering process difference of the present invention be: blank is directly deposited on load bearing board, also buries without powder.
Contact with load bearing board, and the inductance value of the product stacking upper epidermis position only has 0.1 ~ 0.3uH, the inductance value of the product in mid-way is at about 0.6uH, and magnetic core has portion deforms, and conforming product rate only has 30 ~ 40%.
Claims (1)
1. the little magnetic core sintering process of Mn-Zn ferrite, is characterized in that: comprise the steps,
1) on load bearing board, first spread one deck powder identical with the blank material of the little magnetic core of Mn-Zn ferrite, then stack the little magnetic core blank of Mn-Zn ferrite, then with the powder identical with blank material, little for Mn-Zn ferrite magnetic core blank is buried;
2) the little magnetic core blank of Mn-Zn ferrite through step 1) process is sintered in kiln;
3) after sintering, products obtained therefrom is placed in vibrating ball mill vibration, then through ultrasonic cleaning, places more than 24 hours, namely obtain the little magnetic core of Mn-Zn ferrite.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310279176.0A CN103342562B (en) | 2013-07-04 | 2013-07-04 | Sintering process of magnesium-iron ferrite small magnetic core |
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| CN201310279176.0A CN103342562B (en) | 2013-07-04 | 2013-07-04 | Sintering process of magnesium-iron ferrite small magnetic core |
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| CN103342562A CN103342562A (en) | 2013-10-09 |
| CN103342562B true CN103342562B (en) | 2015-02-04 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170097394A1 (en) * | 2015-10-06 | 2017-04-06 | The Charles Stark Draper Laboratory, Inc. | Magnetic field detector system |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017105596A2 (en) | 2015-10-06 | 2017-06-22 | The Charles Stark Draper Laboratory, Inc. | Electric field detector system |
| US10531805B2 (en) | 2016-09-30 | 2020-01-14 | The Charles Stark Draper Laboratory, Inc. | Biophysical sensing systems and methods using non-contact electric field detectors |
| WO2018187307A1 (en) | 2017-04-04 | 2018-10-11 | The Charles Stark Draper Laboratory, Inc. | Miniature electric field detector |
| US11525870B2 (en) | 2017-10-05 | 2022-12-13 | The Charles Stark Draper Laboratory, Inc. | Electromagnetic gradiometers |
| US12089941B2 (en) | 2019-03-15 | 2024-09-17 | The Charles Stark Draper Laboratory, Inc. | Miniature electric field detector |
| CN114121472B (en) * | 2021-11-15 | 2024-05-24 | 海宁华悦电子有限公司 | Sintering process of ferrite core |
| CN114300248B (en) * | 2021-12-23 | 2024-02-27 | 天长市中德电子有限公司 | High-pressure-bearing manganese zinc ferrite magnetic core |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4129917B2 (en) * | 2003-01-10 | 2008-08-06 | Ｔｄｋ株式会社 | Ferrite material and manufacturing method thereof |
| CN102491738B (en) * | 2011-11-24 | 2014-03-12 | 江苏省晶石磁性材料与器件工程技术研究有限公司 | Method for producing high permeability mangan zinc ferrite |
| CN102643083B (en) * | 2012-04-01 | 2014-10-29 | 天长市昭田磁电科技有限公司 | Method for producing soft magnetic ferrite core |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20170097394A1 (en) * | 2015-10-06 | 2017-04-06 | The Charles Stark Draper Laboratory, Inc. | Magnetic field detector system |
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