JPH0499003A - Manufacture of barium ferrite magnet - Google Patents
Manufacture of barium ferrite magnetInfo
- Publication number
- JPH0499003A JPH0499003A JP2208397A JP20839790A JPH0499003A JP H0499003 A JPH0499003 A JP H0499003A JP 2208397 A JP2208397 A JP 2208397A JP 20839790 A JP20839790 A JP 20839790A JP H0499003 A JPH0499003 A JP H0499003A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- pva
- binder
- manufacturing
- ferrite
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004519 manufacturing process Methods 0.000 title claims description 14
- AJCDFVKYMIUXCR-UHFFFAOYSA-N oxobarium;oxo(oxoferriooxy)iron Chemical compound [Ba]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O.O=[Fe]O[Fe]=O AJCDFVKYMIUXCR-UHFFFAOYSA-N 0.000 title claims description 10
- 238000000034 method Methods 0.000 claims abstract description 27
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims abstract description 22
- AYJRCSIUFZENHW-UHFFFAOYSA-L barium carbonate Chemical compound [Ba+2].[O-]C([O-])=O AYJRCSIUFZENHW-UHFFFAOYSA-L 0.000 claims abstract description 18
- 239000011230 binding agent Substances 0.000 claims abstract description 13
- 229910000859 α-Fe Inorganic materials 0.000 claims abstract description 11
- AYJRCSIUFZENHW-DEQYMQKBSA-L barium(2+);oxomethanediolate Chemical compound [Ba+2].[O-][14C]([O-])=O AYJRCSIUFZENHW-DEQYMQKBSA-L 0.000 claims abstract 2
- 238000005245 sintering Methods 0.000 claims description 13
- 238000010304 firing Methods 0.000 claims description 10
- 239000002994 raw material Substances 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 abstract description 7
- 239000007858 starting material Substances 0.000 abstract description 6
- 239000000203 mixture Substances 0.000 abstract description 3
- 238000000465 moulding Methods 0.000 abstract description 3
- 238000005469 granulation Methods 0.000 abstract description 2
- 230000003179 granulation Effects 0.000 abstract description 2
- 235000011089 carbon dioxide Nutrition 0.000 abstract 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract 1
- 239000000463 material Substances 0.000 abstract 1
- 230000000630 rising effect Effects 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 238000010298 pulverizing process Methods 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000002075 main ingredient Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野］
本発明はバリウムフェライト磁石（等方性焼結磁石）の
製造方法に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a method for manufacturing barium ferrite magnets (isotropic sintered magnets).
（従来の技術λ
マグネトブランバイト型のバリウムフェライト磁石（等
方性焼結磁石］の製造は、通常、主成分原料として一般
のフェライト用酸化鉄及び炭酸バリウムを用いて、原料
を秤量混合後、仮焼結、粉砕、造粒、成形、焼結の工程
を紅る−般的なセラミックの製造方法が取られており、
低コスト化を図るため前記の製造方法において、仮焼結
１粉砕の工程を省略すると、一般のフェライト用酸化鉄
と炭酸バリウムを用いた場合には製品密度の低下、割れ
、クラック、変形、特性の劣化等の問題を引き起こして
いる。(Conventional technology λ) The production of magnetobrambite-type barium ferrite magnets (isotropic sintered magnets) usually uses general iron oxide and barium carbonate for ferrite as the main component raw materials, and after weighing and mixing the raw materials, A common ceramic manufacturing method is used, which includes preliminary sintering, crushing, granulation, molding, and sintering.
In order to reduce costs, if the preliminary sintering and pulverization steps are omitted in the above manufacturing method, if iron oxide and barium carbonate for general ferrite are used, the product density will decrease, cracks, deformation, and characteristics will occur. causing problems such as deterioration of
（発明が解決しようとする課題）
本発明は一般のフェライト用酸化鉄と炭酸バリウムを主
成分原料とし、仮焼結工程を省略して低コスト化を図９
、しかも上記の欠陥を解消できるバリウムフェライト磁
石の製造方法を提供するものである。(Problems to be Solved by the Invention) The present invention uses iron oxide and barium carbonate as the main ingredients for general ferrite, and eliminates the temporary sintering process to reduce costs.
Moreover, the present invention provides a method for manufacturing a barium ferrite magnet that can eliminate the above-mentioned defects.
（課題を解決するための手段）
第１の発明はフェライト用酸化鉄と炭酸バリウムを主原
料として混合し、ＰｖＡをバインダーとして造粒し、所
要の圧粉密度で成形し、焼成工程で焼結して成る焼結磁
石の製造方法において、焼成工程の１８０°０〜４５０
６０までの温域では温度制御手段によりＰＶＡを除去し
てポーラス状化して成る。ここに、温度制御手段とは昇
温速度が４’ ０７ｍ１ｍを上限とする昇温速度で制御
するものから、１８０℃〜４５０６０間の任意の温度を
所定時間キープして温度管理するものまでを含む。(Means for Solving the Problems) The first invention mixes iron oxide for ferrite and barium carbonate as main raw materials, granulates it with PvA as a binder, shapes it to the required green density, and sinters it in the firing process. In the method for manufacturing a sintered magnet made of
In the temperature range up to 60°C, PVA is removed by a temperature control means to make it porous. Here, the temperature control means includes those that control the temperature at a heating rate with an upper limit of 4'07m1m, and those that control the temperature by keeping an arbitrary temperature between 180°C and 45060°C for a predetermined period of time. .
第２の発明はフェライト用酸化鉄と炭酸バリウムを主原
料として混合し、ＰＶＡをバインダーとして造粒し、所
要の圧粉密度で成形し、焼成工程で焼結して成る焼結磁
石の製造方法において、焼成工程の昇温始めから焼結温
度に至るまでを４°Ｏ／ｗｉｎを上限とする昇温速度で
緩昇温し、１８０°’Ｏ〜４５０°Ｏ間でＰ’ＶＡ ヲ
除去シテホーラス化して成る。The second invention is a method for manufacturing a sintered magnet, in which iron oxide for ferrite and barium carbonate are mixed as main raw materials, granulated with PVA as a binder, molded to a required powder density, and sintered in a firing process. In the process, the temperature is slowly increased from the beginning of temperature increase in the firing process to the sintering temperature at a temperature increase rate with an upper limit of 4°O/win, and P'VA is removed between 180°O and 450°O. It is made up of
（作 用）
焼成工程の１８０°’ｏ 〜４５０°０間を／ ７１ｎ
ｆ上限とする昇温速度で緩昇温することにより、ＰＶ
Ａを完全に除去することができ、その後の８００ｃｂｗ
Ｊまでに炭酸ガスをスムースに除去することになる◎
（実施例］
例１
一般のフェライト用酸化鉄と炭酸バリウムを出発原料と
し、ＢａＯとＰｅ２０３の組成比率が１＝５．３相当と
なる割合で混合し、前記出発原料１００座量％に対し、
１．５重量％のＰＶＡをバインダー（接着剤）として添
加して圧粉密度を２．７５／ＷＩ〜３．２シｌとして圧
力２．５トシ／−で直径３０龍、厚さ８１ａＩのテスト
ピースを成形し、１８０°ｃ〜４５０°ａ間の緩昇温の
条件に対応する４５０’Ｏ以降の焼結温度（１２５１ｆ
Ｃ）までの昇温速度を変えて試験したものであるが、別
表１にその結果を示すように、１８０°０〜４５０６０
間の昇温速度が４０シ／ｗｉｎ以下であればその後ノ４
５０°０〜１２５０°ａｙでの昇温速度に関係なく、ク
ラックや１ｌｌＪｎ〜変形が起こらないことが分かる。(Function) Between 180°'o and 450°0 during the firing process /71n
By slowly increasing the temperature at the temperature increase rate set as the upper limit of f, the PV
A can be completely removed and the subsequent 800 cbw
Carbon dioxide gas will be removed smoothly by J◎ (Example) Example 1 Using general ferrite iron oxide and barium carbonate as starting materials, the composition ratio of BaO and Pe203 is equivalent to 1 = 5.3. and based on 100% basis weight of the starting materials,
1.5% by weight of PVA was added as a binder (adhesive), the density of the powder was set to 2.75/WI to 3.2 sills, the pressure was 2.5 tos/-, the diameter was 30 mm, and the thickness was 81 aI. The piece is molded and the sintering temperature is set to 450'O or higher (1251f
The test was conducted by changing the heating rate up to C), and as shown in Attached Table 1, the temperature was 180°0 to 45060°.
If the temperature increase rate during the period is 40 sh/win or less, then
It can be seen that cracks and deformation do not occur regardless of the temperature increase rate from 50°0 to 1250°ay.
このことから１焼成工程の１８０℃〜４５０°Ｏ間を緩
昇温（４°ＶＷｉｎを上限とするλすることによりバイ
ンダーを完全に除去し、その後４５０℃〜８００°ｃ間
で発生する炭酸ガスがスムーズに抜は出たことが分かる
。したがって、バインダーが除去された羨・；その後の
昇温速度に関係なく、割れ、クラ７り、変形が起こらな
いことが分かる。From this, the binder is completely removed by slowly raising the temperature between 180°C and 450°O in one firing process (λ with an upper limit of 4°VWin), and then carbon dioxide gas is generated between 450°C and 800°C. It can be seen that the binder was removed smoothly. Therefore, it can be seen that no cracking, cracking, or deformation occurs regardless of the temperature increase rate after the binder is removed.
例２
一般のフェライト用酸化鉄と炭酸バリウムを出発原料と
し、Ｂ＆０と１０２０３の組成比率が１＝５．３相当と
なる割合で混合し、前記出発原料１００重量％に対し、
１．５重量外のＰＶｉをバインダとして添加して造粒し
１圧粉密度を２．７！ｃｗｔ〜６．２ｖメトシテ圧力２
．５ ト’７６ｙｄ テ直径３０冑、厚さ８１１ＩＩＩ
のテストピースを成形し１焼成工程の１８０℃〜４５０
°０の温度域を３°で１ｎの昇温速度で昇温し、その後
を経済昇温速度で昇温し、各種の焼結温度で焼結したと
きの焼結密度及び磁気特性等を調査し、その結果を別表
２に示すものである。これらの結果から脱バインダー後
、炭酸ガスをガス抜きし、１１５１１ｆＯ〜１３００°
０で焼結すれば仮焼結、粉砕工程を省略しても良好な特
性のバリウムフェライト磁石を製造することが明らかで
ある。Example 2 General iron oxide for ferrite and barium carbonate were used as starting materials, and mixed in a proportion such that the composition ratio of B&0 and 10203 was equivalent to 1 = 5.3, and based on 100% by weight of the starting materials,
1.5 weight of PVi is added as a binder and granulated to give a density of 1 green powder of 2.7! cwt~6.2v metoshite pressure 2
．． 5 '76yd Te diameter 30, thickness 811III
A test piece was molded and heated to 180℃ to 450℃ for one firing process.
We investigated the sintered density, magnetic properties, etc. of sintering at various sintering temperatures by increasing the temperature in the temperature range of 0° to 3° at a heating rate of 1n, then increasing the temperature at an economical heating rate, and sintering at various sintering temperatures. The results are shown in Attached Table 2. Based on these results, after removing the binder, degassing the carbon dioxide gas, and
It is clear that barium ferrite magnets with good characteristics can be produced by sintering at zero, even if the preliminary sintering and pulverization steps are omitted.
（発明の効果Ｊ
以上のように本発明によｎば大幅に工程を簡酪化するこ
とができるため、低コストで従来と同じ性能を持つバリ
ウムフェライト磁石を提供でき、工業的に極めて有用で
あるＯ(Effect of the invention J As described above, the present invention can greatly simplify the process, and therefore can provide barium ferrite magnets with the same performance as conventional ones at low cost, making them extremely useful industrially. There is an O
Claims (4)
て混合し、ＰＶＡをバインダーとして造粒し、所要の圧
粉密度で成形し、焼成工程で焼結して成る焼結磁石の製
造方法において、焼成工程の１８０℃〜４５０℃までの
温域では温度制御手段によりＰＶＡを除去してポーラス
状化し、クラツクや割れ発生のないことを特徴としたバ
リウムフエライト磁石の製造方法。(1) In a method for manufacturing a sintered magnet, the raw materials are mixed with iron oxide for ferrite and barium carbonate, granulated with PVA as a binder, molded to the required powder density, and sintered in the firing process, A method for manufacturing barium ferrite magnets, characterized in that PVA is removed and made porous by a temperature control means in the temperature range of 180°C to 450°C during the firing process, and no cracks or cracks occur.
度で昇温して成る請求項（１）記載のバリウムフエライ
ト磁石の製造方法。(2) The method for manufacturing a barium ferrite magnet according to claim (1), wherein the temperature control means increases the temperature at a temperature increase rate with an upper limit of 4° C./min.
度を所定時間キープして成る請求項（１）記載のバリウ
ムフエライト磁石の製造方法。(3) The method for manufacturing a barium ferrite magnet according to claim (1), wherein the temperature control means maintains an arbitrary temperature between 180°C and 450°C for a predetermined period of time.
て混合し、ＰＶＡをバインダーとして造粒し、所要の圧
粉密度で成形し、焼成工程で焼結して成る焼結磁石の製
造方法において、焼成工程の昇温始めから焼結温度に至
るまでを４℃／ｍｉｎを上限とする昇温速度で緩昇温し
、１８０℃〜４５０℃間でＰＶＡを除去してポーラス化
し、クラツクや割れ発生のないことを特徴としたバリウ
ムフエライト磁石の製造方法。(4) In a method for manufacturing a sintered magnet, the ferrite iron oxide and barium carbonate are mixed as main raw materials, granulated with PVA as a binder, molded to a required powder density, and sintered in a firing process, From the beginning of the temperature rise in the firing process to the sintering temperature, the temperature is slowly raised at a rate of up to 4℃/min, and between 180℃ and 450℃, PVA is removed and made porous, causing cracks and cracks. A method for manufacturing a barium ferrite magnet characterized by no.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2208397A JPH0499003A (en) | 1990-08-06 | 1990-08-06 | Manufacture of barium ferrite magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2208397A JPH0499003A (en) | 1990-08-06 | 1990-08-06 | Manufacture of barium ferrite magnet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0499003A true JPH0499003A (en) | 1992-03-31 |
Family
ID=16555580
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2208397A Pending JPH0499003A (en) | 1990-08-06 | 1990-08-06 | Manufacture of barium ferrite magnet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0499003A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS48102109A (en) * | 1972-04-06 | 1973-12-22 | ||
| JPS5416039A (en) * | 1977-06-06 | 1979-02-06 | Cummins Engine Co Inc | Exhaust brake valve |
-
1990
- 1990-08-06 JP JP2208397A patent/JPH0499003A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS48102109A (en) * | 1972-04-06 | 1973-12-22 | ||
| JPS5416039A (en) * | 1977-06-06 | 1979-02-06 | Cummins Engine Co Inc | Exhaust brake valve |
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