JP2001167918A - Ferrite magnet and manufacturing method therefor - Google Patents

Ferrite magnet and manufacturing method therefor

Info

Publication number
JP2001167918A
JP2001167918A JP34719899A JP34719899A JP2001167918A JP 2001167918 A JP2001167918 A JP 2001167918A JP 34719899 A JP34719899 A JP 34719899A JP 34719899 A JP34719899 A JP 34719899A JP 2001167918 A JP2001167918 A JP 2001167918A
Authority
JP
Japan
Prior art keywords
ferrite magnet
weight
ferrite
magnet
content
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.)
Granted
Application number
JP34719899A
Other languages
Japanese (ja)
Other versions
JP3936507B2 (en
Inventor
Hiroshi Iwasaki
洋 岩崎
Tokuyuki Noda
徳幸 野田
Osamu Fujita
修 藤田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Proterial Ltd
Original Assignee
Hitachi Metals Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Metals Ltd filed Critical Hitachi Metals Ltd
Priority to JP34719899A priority Critical patent/JP3936507B2/en
Publication of JP2001167918A publication Critical patent/JP2001167918A/en
Application granted granted Critical
Publication of JP3936507B2 publication Critical patent/JP3936507B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Hard Magnetic Materials (AREA)
  • Manufacturing Cores, Coils, And Magnets (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a ferrite magnet having stable magnetic characteristic by setting the main component composition of the general formula MO.nFe2O3 (M is at least one or more kinds out of Sr, Ba, Pb and Ca and n is in a range of 4.8-6.2) and specifying the allowable content of La and Co as inevitable impurities, and a manufacturing method of the magnet. SOLUTION: This ferrite magnet has a main component composition practically expressed by the general formula MO.nFe2O3 (M is at least one or more kinds out of Sr, Ba, Pb and Ca and an is in a range of 4.8-6.2), and magnetoplumbite type crystal structure. Inevitable contents of La and Ca are at most 0.10 wt.% (0 is not included) and at most 0.03 wt.% (0 is not included), respectively.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、主要成分組成が一
般式:MO・nFe3(MはSr,Ba,Pb,C
aのうちの少なくとも1種以上であり、nは4.8〜6.2の
範囲である)で示され、実質的にマグネトプランバイト
型結晶構造を有するとともに保磁力iHcおよび残留磁束
密度Brに顕著な影響を及ぼす不可避的不純物としてのL
aおよびCoの許容される含有量を特定して安定した磁
気特性を得られるようにしたフェライト磁石およびその
製造方法に関する。
[0001] The present invention relates to a composition of the present invention wherein the main component composition is represented by the general formula: MO.nFe 2 O 3 (M is Sr, Ba, Pb, C
a, wherein n is in the range of 4.8 to 6.2), and has a substantially magnetoplumbite type crystal structure, and has a significant effect on the coercive force iHc and the residual magnetic flux density Br. L as an inevitable impurity
The present invention relates to a ferrite magnet capable of obtaining stable magnetic properties by specifying an allowable content of a and Co and a method for producing the same.

【0002】[0002]

【従来の技術】フェライト磁石は、モーターあるいは発
電機等の回転機を含む種々の用途に使用されている。最
近では、自動車用回転機分野では小型・軽量化を目的と
し、電気機器用回転機分野では高効率化を目的としてよ
り高い磁気特性を有するフェライト磁石が求められてい
る。従来のマグネトプランバイト型フェライト磁石は通
常以下のようにして製造されている。 例えば、Srフ
ェライト磁石は、酸化鉄とSrの炭酸塩とを所定比率で
混合した後仮焼してフェライト化し、クリンカーを得
る。次に、この仮焼したクリンカーを粗粉砕後、さらに
微粉砕する。微粉砕時に、焼結性を制御するためにSi
O2、SrCo3およびCaCO3、さらに保磁力iHcの制御のため
に所定量のAl2O3あるいはCr2O3を添加後、続いて所定粒
径まで微粉砕する。次に、得られた微粉を用いて乾式磁
場中成形または湿式磁場中成形して成形体を得、その後
焼結、機械加工してフェライト磁石製品を得ている。
2. Description of the Related Art Ferrite magnets are used in various applications including rotating machines such as motors and generators. Recently, ferrite magnets having higher magnetic properties have been demanded in the field of rotating machines for automobiles for the purpose of size reduction and weight reduction, and in the field of rotating machines for electric equipment in order to achieve higher efficiency. Conventional magnetoplumbite ferrite magnets are usually manufactured as follows. For example, an Sr ferrite magnet is obtained by mixing iron oxide and a carbonate of Sr at a predetermined ratio and then calcining the ferrite to obtain a clinker. Next, the calcined clinker is roughly pulverized after coarse pulverization. During pulverization, Si is used to control sinterability.
After adding a predetermined amount of Al 2 O 3 or Cr 2 O 3 for controlling O 2 , SrCo 3 and CaCO 3 and further controlling the coercive force iHc, the mixture is then finely ground to a predetermined particle size. Next, using the obtained fine powder, molding is performed in a dry magnetic field or in a wet magnetic field to obtain a molded body, which is then sintered and machined to obtain a ferrite magnet product.

【0003】特許第2922864号には、主要成分組成が、 一般式:(Sr1−xLa)O・n[(Fe1−yCoO
] で示され、x,y,nがそれぞれ、 x=0.05〜0.5、 y=(x/2.2n)〜(x/1.8n)、 n=5.7〜6 である、実質的にマグネトプランバイト型結晶構造を有
する高性能フェライト磁石およびその製造方法が開示さ
れている。このフェライト磁石は従来のマグネトプラン
バイト型フェライト磁石の保磁力を大きく高め、かつ最
大エネルギー積(BH)maxを向上した新規な高性能フェラ
イト磁石であり、例えば自動車用途の回転機、家電用の
回転機あるいは静電現像装置用のマグネットロール等の
多様な磁石応用製品分野への適用が進められている。
Japanese Patent No. 2922864 discloses that the main component composition is represented by the general formula: (Sr 1-x La x ) On · [(Fe 1-y Co y ) 2 O
3 ] wherein x, y, and n are respectively x = 0.05 to 0.5, y = (x / 2.2n) to (x / 1.8n), and n = 5.7 to 6, substantially a magnetoplumbite. A high-performance ferrite magnet having a type crystal structure and a method for manufacturing the same are disclosed. This ferrite magnet is a new high-performance ferrite magnet that greatly increases the coercive force of the conventional magnetoplumbite type ferrite magnet and improves the maximum energy product (BH) max. Application to various magnet applied product fields such as a machine or a magnet roll for an electrostatic developing device is being promoted.

【0004】フェライト工場では多様な材質のフェライ
ト磁石が大量に生産されている。この多様な材質のフェ
ライト磁石製品の製造工程において不可避的に成形体不
良、焼結体不良(割れ、欠けまたは変形品等)あるいは
健全な焼結品を所定寸法に機械加工する際に発生する焼
結体素材の切り出し端材または切り粉(グラ粉)等のフ
ェライト磁石のスクラップが発生する。これらスクラッ
プを廃棄すると環境汚染を招来するのでリサイクルする
ことが必須である。しかし、通常の工業生産で発生する
これらスクラップは多様なフェライト磁石材質を反映し
ており、スクラップのロット毎の成分ばらつきが大きい
ことが工業生産上問題である。すなわち、LaおよびC
oを所定量含有する前記高性能フェライト磁石の工業生
産が開始されるに至り、前記スクラップのロット毎のL
aおよびCo含有量のばらつきが大きくなり、前記スク
ラップを配合して製造したSrフェライト磁石等の磁気
特性のばらつきが従来よりも大きくなるという問題が発
生している。
At a ferrite factory, ferrite magnets of various materials are produced in large quantities. In the process of manufacturing ferrite magnet products of various materials, there is inevitably a molded product defect, a sintered product defect (crack, chipping or deformed product, etc.), or a burning that occurs when a healthy sintered product is machined to a predetermined size. Scraps of ferrite magnets, such as cut-out scraps of the consolidated material or cutting powder (grass powder), occur. Discarding these scraps leads to environmental pollution, so it is essential to recycle them. However, these scraps generated in normal industrial production reflect various ferrite magnet materials, and there is a problem in industrial production that the component variation among scrap lots is large. That is, La and C
industrial production of the high-performance ferrite magnet containing a predetermined amount of o, the L for each scrap lot
There is a problem that the dispersion of the contents of a and Co becomes large, and the dispersion of the magnetic properties of the Sr ferrite magnet or the like manufactured by blending the scrap becomes larger than before.

【0005】[0005]

【発明が解決しようとする課題】したがって、本発明の
課題は、主要成分組成が一般式:MO・nFe
3(MはSr,Ba,Pb,Caのうちの少なくとも1
種以上であり、nは4.8〜6.2の範囲である)で示され、
実質的にマグネトプランバイト型結晶構造を有するとと
もに保磁力iHcおよび残留磁束密度Brに顕著な影響を及
ぼす不可避不純物としてのLaおよびCoの許容される
含有量を特定することにより安定した磁気特性を得られ
るようにしたフェライト磁石およびその製造方法を提供
することである。
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a compound of the general formula: MO.nFe 2 O
3 (M is at least one of Sr, Ba, Pb and Ca
Or more, and n is in the range of 4.8 to 6.2)
Stable magnetic properties are obtained by specifying the allowable contents of La and Co as unavoidable impurities that have a substantially magnetoplumbite type crystal structure and significantly affect the coercive force iHc and residual magnetic flux density Br And a method for manufacturing the same.

【0006】[0006]

【課題を解決するための手段】上記課題を達成した本発
明は、主要成分組成が一般式:MO・nFe3(M
はSr,Ba,Pb,Caのうちの少なくとも1種以上
であり、nは4.8〜6.2の範囲である)で示され、実質的
にマグネトプランバイト型結晶構造を有し、不可避的に
含有されるLa含有量が0.10重量%以下(0を含まず)
でありかつCo含有量が0.03重量%以下(0を含まず)
であるフェライト磁石である。本発明によれば、不可避
的に含有されるLaおよびCo含有量を所定量以下に低
減することにより、iHcおよびBrのばらつきが従来のS
rまたはBaフェライト磁石等とほぼ同等以上に低減さ
れた、実質的にマグネトプランバイト型結晶構造を有す
るフェライト磁石を安定して提供することができる。前
記フェライト磁石のモル比nが4.8未満ではBrが大きく
低下し、6.2超ではiHcが大きく低下するので、モル比n
=4.8〜6.2とすることがよい。
According to the present invention which has achieved the above objects, the present invention has a main component composition represented by a general formula: MO.nFe 2 O 3 (M
Is at least one of Sr, Ba, Pb, and Ca, and n is in the range of 4.8 to 6.2), has a substantially magnetoplumbite type crystal structure, and is inevitably contained. La content is 0.10% by weight or less (excluding 0)
And the Co content is 0.03% by weight or less (excluding 0)
Is a ferrite magnet. According to the present invention, the variation of iHc and Br is reduced by the conventional S by reducing the La and Co contents inevitably contained to a predetermined amount or less.
It is possible to stably provide a ferrite magnet having a substantially magnetoplumbite-type crystal structure, which is reduced to be substantially equal to or larger than that of an r or Ba ferrite magnet or the like. When the molar ratio n of the ferrite magnet is less than 4.8, Br is greatly reduced, and when it is more than 6.2, iHc is significantly reduced.
= 4.8 to 6.2.

【0007】また本発明は、主要成分組成が一般式:M
O・nFe3(MはSr,Ba,Pb,Caのうち
の少なくとも1種以上であり、nは4.8〜6.2の範囲であ
る)で示され、実質的にマグネトプランバイト型結晶構
造を有し、不可避的に含有されるLa含有量が0.10重量
%以下(0を含まず)でありかつCo含有量が0.03重量
%以下(0を含まず)であるフェライト磁石の製造方法
であって、不可避的に含有されるLa含有量が0.01重量%
以上でありかつCo含有量が0.01重量%以上である前記フ
ェライト磁石のスクラップを5〜95重量%配合したもの
を成形原料として成形、焼結するフェライト磁石の製造
方法である。本発明によれば、前記スクラップのリサイ
クルが効率よく行えるとともにiHcおよびBrのばらつき
を従来とほぼ同等以上に低減したSrまたはBaフェラ
イト磁石等を安定に製造する方法を提供することができ
る。
In the present invention, the main component composition is represented by the general formula: M
O.nFe 2 O 3 (M is at least one of Sr, Ba, Pb and Ca, and n is in the range of 4.8 to 6.2), and substantially has a magnetoplumbite type crystal structure. A method for producing a ferrite magnet having a La content of 0.10% by weight or less (not including 0) and a Co content of 0.03% by weight or less (not including 0). Inevitably contained La content of 0.01% by weight
This is a method for producing a ferrite magnet in which a mixture of 5 to 95% by weight of the ferrite magnet scrap having a Co content of 0.01% by weight or more is molded and sintered as a molding raw material. According to the present invention, it is possible to provide a method for stably producing a Sr or Ba ferrite magnet or the like in which the scrap can be efficiently recycled and the variation in iHc and Br is reduced to substantially the same level or more as before.

【0008】[0008]

【発明の実施の態様】以下に本発明を実施例により詳細
に説明するが、それら実施例により本発明が限定される
ものではない。 (実施例1)表1のNo.1に示すように、原子比率で一般
式: SrO・6.0FeOで示される主要成分組成を有す
るSrフェライト磁石のnew材粗粉(空気透過法による平
均粒径が約5μmの仮焼粗粉)と、SrO・6.0FeO
示される主要成分組成を有しており不可避的に含有する
La=0.48wt%でありかつCo=0.15wt%である焼結体の削り粉
(空気透過法による平均粒径が約5μmのスクラップ粗
粉)とを、重量比率で95:5になるように配合した混合粗
粉を作製した。次に、この混合粗粉を湿式アトライタに
投入後、投入した混合粗粉の総重量に対してSrCOを0.
5重量%、CaCO を0.8重量%、SiOを0.3重量%添加
し、さらに水を加えて湿式微粉砕して空気透過法による
平均粒径で約0.8μmのフェライト微粉末粒子が分散し
たスラリーを得た。このスラリーを用いて磁場中成形
後、成形体を1200℃で2時間焼結してNo.1のフェラ
イト磁石を得た。次に、一般式: SrO・6.0FeO
示される主要成分組成を有するSrフェライト磁石のnew
材粗粉(空気透過法による平均粒径が約5μmの仮焼粗
粉)と、SrO・6.0FeOで示される主要成分組成を有
しており不可避的に含有するLa=0.48wt%でありかつCo=
0.15wt%である焼結体の削り粉(空気透過法による平均
粒径が約5μmのスクラップ粗粉)とを、表1のNo.2に
示すように重量比率で80:20になるように配合した混合
粗粉を用いた以外はNo.1の場合と同様にしてNo.2のフェ
ライト磁石を得た。次に、作製したNo.1およびNo.2の各
15個のフェライト磁石を機械加工して外径15mm×厚み10
mm(厚み方向が磁化方向)の寸法に仕上げた。次に、こ
れら30個のフェライト磁石の室温(20℃)における磁気
特性を測定した。その結果、前記フェライト磁石の残留
磁束密度Brのばらつき(dBrは測定した30個のフェライ
ト磁石のBrの最大値と最小値との差である)は0.2kG以
下、iHcのばらつき(diHcは測定した30個のフェライト
磁石のiHcの最大値と最小値との差である)は0.3kOe以
下であり、dBrおよびdiHcは非常に小さいことがわかっ
た。次に、 dBrおよびdiHc測定後の各フェライト磁石を
分析した。その結果、いずれも SrO・6.0FeO で示さ
れる主要成分組成を有しており、不可避的に含有される
La=0.01〜0.10wt%でありかつCo=0.01〜0.03wt%であっ
た。 (比較例1)表1のNo.3に示すように、一般式: SrO
・6.0FeOで示される主要成分組成を有するSrフ
ェライト磁石のnew材粗粉(空気透過法による平均粒径
が約5μmの仮焼粗粉)のみを用いた以外はNo.1の場合
と同様にして比較例のフェライト磁石を30個作製し、評
価した。結果を表1のNo.3に示す。これら30個のフェ
ライト磁石のdBrは0.2kG以下、diHcは0.3kOe以下であ
り、いずれもSrO・6.0FeO で示される主要成分組成
を有しており、不可避的に含有されるLa<0.01wt%であ
りかつCo<0.01wt%であった。 (比較例2)実施例1と同様のnew材粗粉およびスクラ
ップ粗粉を用いて、両者の混合重量比率を、95:5とした
混合粗粉(No.11),50:50とした混合粗粉(No.12),
1:99とした混合粗粉(No.13)を作製した。これら3種
の混合粗粉をそれぞれ用いた以外はNo.1の場合と同様に
して、No.11の混合粗粉によるフェライト磁石10個、N
o.12の混合粗粉によるフェライト磁石10個、No.13
の混合粗粉によるフェライト磁石10個を作製し、評価し
た。結果を表2に示す。表2に示すように、これら30個
のフェライト磁石のdBrは0.4kG以下、diHcは0.45kOe以
下であり、dBrおよびdiHcが実施例1のものより大きく
実用性に劣ることがわかる。
DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to Examples.
However, the present invention is limited by these examples.
Not something. (Example 1) As shown in No. 1 in Table 1, general
Formula: SrO ・ 6.0Fe2O3Has the main component composition indicated by
New material coarse powder of Sr ferrite magnet (flat by air permeation method)
Calcined coarse powder with an average particle size of about 5μm) and SrO.6.0Fe2O3so
It has the main component composition shown and is inevitably contained
Cutting powder of sintered body with La = 0.48wt% and Co = 0.15wt%
(Scrap coarse with an average particle size of about 5μm by air permeation method
Powder), and blended so that the weight ratio becomes 95: 5
A powder was made. Next, this mixed coarse powder is applied to a wet attritor.
After charging, SrCO is added to the total weight of3To 0.
5% by weight, CaCO 30.8% by weight, SiO20.3% by weight
And then add water and wet pulverize.
Ferrite fine powder particles with an average particle size of about 0.8 μm
A slurry was obtained. Molding in a magnetic field using this slurry
Then, the compact was sintered at 1200 ° C for 2 hours and
I got a magnet. Next, the general formula: SrO ・ 6.0Fe2O3so
New of Sr ferrite magnet with main component composition shown
Coarse powder (calcined coarse powder with average particle size of about 5μm by air permeation method)
Powder) and SrO ・ 6.0Fe2O3Has the main component composition indicated by
Inevitably contained La = 0.48wt% and Co =
0.15wt% of sintered powder (average by air permeation method)
No. 2 in Table 1)
Mixing to be 80:20 by weight ratio as shown
Except that coarse powder was used, the No. 2
I got a light magnet. Next, each of the fabricated No. 1 and No. 2
Machined 15 ferrite magnets, outer diameter 15mm x thickness 10
mm (thickness direction is magnetization direction). Next,
Magnetism of these 30 ferrite magnets at room temperature (20 ℃)
The properties were measured. As a result, the residual ferrite magnet
Variation in magnetic flux density Br (dBr is the measured value of the 30 ferrites
The difference between the maximum and minimum Br of the magnet is 0.2kG or less.
Below, the variation of iHc (diHc is the measured 30 ferrites
The difference between the maximum and minimum iHc of the magnet) is 0.3 kOe or less.
Below and found that dBr and diHc were very small
Was. Next, each ferrite magnet after dBr and diHc measurement
analyzed. As a result, in both cases, SrO ・ 6.0Fe2O3 Indicated by
Has the main component composition and is inevitably contained
La = 0.01 ~ 0.10wt% and Co = 0.01 ~ 0.03wt%
Was. (Comparative Example 1) No. 3 in Table 1*As shown in the general formula: SrO
・ 6.0Fe2O3Sr particles having a main component composition represented by
New material coarse powder of ferrite magnet (average particle size by air permeation method
No. 1 except that only calcined coarse powder of approx.
30 ferrite magnets of the comparative example were prepared in the same manner as
Valued. The result was No.3 in Table 1.*Shown in These 30
The dBr of the light magnet is 0.2 kG or less and diHc is 0.3 kOe or less.
All are SrO ・ 6.0Fe2O 3The main component composition indicated by
Inevitably contained La <0.01 wt%
And Co <0.01 wt%. (Comparative Example 2) New material coarse powder and scrub similar to those in Example 1.
Using a coarse powder, the mixture weight ratio of both was set to 95: 5
Mixed coarse powder (No.11*), 50:50 mixed coarse powder (No.12*),
1:99 mixed coarse powder (No. 13*) Was prepared. These three
No. 1 except that each of the mixed coarse powders was used.
No.11*10 ferrite magnets with mixed coarse powder of N
o.12*No. 13 ferrite magnets with mixed coarse powder of No. 13*
10 ferrite magnets made from the mixed coarse powder of
Was. Table 2 shows the results. As shown in Table 2, these 30
The ferrite magnet has a dBr of 0.4 kG or less and a diHc of 0.45 kOe or less.
Below, where dBr and diHc are greater than those of Example 1.
It turns out that it is inferior in practicality.

【0009】[0009]

【表1】 [Table 1]

【0010】[0010]

【表2】 [Table 2]

【0011】表1、2における粗粉およびフェライト磁
石のLa、Coの含有量は下記のようにして求めた。ま
ず、分析対象の粗粉またはフェライト磁石においてF
e、Mn、Sr、Ba、Si、Ca、La、Co、A
l、Cr、Pbを分析した。次に、これら分析値の合計
に対するLa含有量を求めた。また、前記分析値の合計
に対するCo含有量を求めた。
The contents of La and Co in the coarse powder and the ferrite magnet in Tables 1 and 2 were determined as follows. First, in the coarse powder or ferrite magnet to be analyzed, F
e, Mn, Sr, Ba, Si, Ca, La, Co, A
l, Cr and Pb were analyzed. Next, the La content relative to the sum of these analytical values was determined. Further, the Co content with respect to the total of the analytical values was determined.

【0012】上記実施例ではクラップとして焼結体の削
り粉を用いた場合を記載した。本発明はこれに限定され
ず、LaおよびCoを不可避的に含有するスクラップと
して焼結体の削り粉、焼結体不良、成形体不良の1種ま
たは2種以上を用いることができる。工業生産上、La
含有量が0.01〜2.5重量%でありかつCo含有量が0.01
〜1.3重量%のスクラップが多量に発生するので、new材
とスクラップとの配合重量比率を5〜95:95〜5とするの
が好ましく、10〜80:90〜20とするのがより好ましい。
この配合比率を外れると本発明のフェライト磁石のLa
およびCo含有量範囲内に調整することが困難である。
また、上記実施例では主要成分が実質的にSrフェライ
ト磁石の場合を記載したが、Baフェライト磁石、(S
r,Ba)フェライト磁石、(Sr,Ba,Ca)フェ
ライト磁石または(Sr,Ba,Ca,Pb)フェライ
ト磁石においても同様の効果を得ることができる。ま
た、本発明ではnew材とスクラップとの混合を微粉段階
で行ってもよい。
In the above-mentioned embodiment, the case where the shavings of the sintered body are used as the clap is described. The present invention is not limited to this, and it is possible to use one or more of shavings of a sintered body, defective sintered bodies, and defective molded bodies as scraps inevitably containing La and Co. La for industrial production
The content is 0.01-2.5% by weight and the Co content is 0.01
Since a large amount of scrap of up to 1.3% by weight is generated, the blending weight ratio of the new material and the scrap is preferably 5 to 95:95 to 5, more preferably 10 to 80:90 to 20.
If the ratio is out of this range, the La of the ferrite magnet of the present invention may be changed.
And Co content within the range.
In the above embodiment, the case where the main component is substantially a Sr ferrite magnet is described.
The same effect can be obtained with (r, Ba) ferrite magnet, (Sr, Ba, Ca) ferrite magnet or (Sr, Ba, Ca, Pb) ferrite magnet. In the present invention, the mixing of the new material and the scrap may be performed at the fine powder stage.

【0013】[0013]

【発明の効果】以上記述の通り、本発明によれば、 (1)LaおよびCoを所定量含有するスクラップを高
効率で使用できる。 (2)LaおよびCoを所定量含有するとともに、主要
成分組成が一般式:MO・nFe3(MはSr,B
a,Pb,Caのうちの少なくとも1種以上であり、n
は4.8〜6.2の範囲である)で示されるdBrおよびdiHcを
低減したフェライト磁石およびその製造方法を提供する
ことができる。
As described above, according to the present invention, (1) scrap containing a predetermined amount of La and Co can be used with high efficiency. (2) While containing predetermined amounts of La and Co, the main component composition is represented by the general formula: MO.nFe 2 O 3 (M is Sr, B
at least one of a, Pb, and Ca;
Is in the range of 4.8 to 6.2), and a ferrite magnet with reduced dBr and diHc and a method for producing the same.

───────────────────────────────────────────────────── フロントページの続き Fターム(参考) 5E040 AB04 AB09 BD01 CA01 HB15 NN02 5E062 CD01 CG01  ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5E040 AB04 AB09 BD01 CA01 HB15 NN02 5E062 CD01 CG01

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】 主要成分組成が一般式:MO・nFe
3(MはSr,Ba,Pb,Caのうちの少なくとも
1種以上であり、nは4.8〜6.2の範囲である)で示さ
れ、実質的にマグネトプランバイト型結晶構造を有し、
不可避的に含有されるLa含有量が0.10重量%以下(0
を含まず)でありかつCo含有量が0.03重量%以下(0
を含まず)であることを特徴とするフェライト磁石。
1. A composition of a main component having a general formula: MO.nFe 2
O 3 (M is at least one of Sr, Ba, Pb, Ca, and n is in the range of 4.8 to 6.2), and has a substantially magnetoplumbite type crystal structure;
La content inevitably contained is 0.10% by weight or less (0%
And a Co content of 0.03% by weight or less (0%).
Ferrite magnet).
【請求項2】 主要成分組成が一般式:MO・nFe
3(MはSr,Ba,Pb,Caのうちの少なくとも
1種以上であり、nは4.8〜6.2の範囲である)で示さ
れ、実質的にマグネトプランバイト型結晶構造を有し、
不可避的に含有されるLa含有量が0.10重量%以下(0
を含まず)でありかつCo含有量が0.03重量%以下(0
を含まず)であるフェライト磁石の製造方法であって、 不可避的に含有されるLa含有量が0.01重量%以上であ
りかつCo含有量が0.01重量%以上である前記フェライ
ト磁石のスクラップを5〜95重量%配合したものを成形
原料として成形、焼結することを特徴とするフェライト
磁石の製造方法。
2. The composition of a main component having the general formula: MO.nFe 2
O 3 (M is at least one of Sr, Ba, Pb, Ca, and n is in the range of 4.8 to 6.2), and has a substantially magnetoplumbite type crystal structure;
La content inevitably contained is 0.10% by weight or less (0%
And a Co content of 0.03% by weight or less (0%).
Wherein the La content inevitably contained is 0.01% by weight or more and the Co content is 0.01% by weight or more. A method for producing a ferrite magnet, comprising molding and sintering a composition containing 95% by weight as a forming raw material.
JP34719899A 1999-12-07 1999-12-07 Ferrite magnet manufacturing method Expired - Lifetime JP3936507B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP34719899A JP3936507B2 (en) 1999-12-07 1999-12-07 Ferrite magnet manufacturing method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP34719899A JP3936507B2 (en) 1999-12-07 1999-12-07 Ferrite magnet manufacturing method

Publications (2)

Publication Number Publication Date
JP2001167918A true JP2001167918A (en) 2001-06-22
JP3936507B2 JP3936507B2 (en) 2007-06-27

Family

ID=18388595

Family Applications (1)

Application Number Title Priority Date Filing Date
JP34719899A Expired - Lifetime JP3936507B2 (en) 1999-12-07 1999-12-07 Ferrite magnet manufacturing method

Country Status (1)

Country Link
JP (1) JP3936507B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002343616A (en) * 2001-05-15 2002-11-29 Tdk Corp Method for manufacturing oxide containing rare earth element

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002343616A (en) * 2001-05-15 2002-11-29 Tdk Corp Method for manufacturing oxide containing rare earth element
JP4599752B2 (en) * 2001-05-15 2010-12-15 Tdk株式会社 Method for producing sintered ferrite magnet

Also Published As

Publication number Publication date
JP3936507B2 (en) 2007-06-27

Similar Documents

Publication Publication Date Title
JP4952957B2 (en) Rotating machine, bonded magnet, magnet roll, and method for producing sintered ferrite magnet
TWI434302B (en) Oxide magnetic material and preparation method thereof, and ferrite iron sintered magnet and preparation method thereof
JP4367649B2 (en) Ferrite sintered magnet
US6858156B2 (en) Ferrite magnet and both rotor and magnet roll comprising the same
JP2922864B2 (en) Ferrite magnet and manufacturing method thereof
KR101082389B1 (en) Magnetoplumbite-type ferrite magnetic material and segment-type permanent magnet derived therefrom
JP3506174B2 (en) Method for producing ferrite magnet and powder thereof
US11476023B2 (en) Ferrite sintered magnet
JPH11251127A (en) High-performance ferrite magnet and its manufacture
JP2001052912A (en) Ferrite magnet material, sintered magnet and bonded magnet
JP2003151811A (en) Sintered ferrite magnet and its manufacturing method
JP7367582B2 (en) ferrite sintered magnet
JP3936507B2 (en) Ferrite magnet manufacturing method
JP4599752B2 (en) Method for producing sintered ferrite magnet
JP2002141212A (en) Rotating machine
KR20070017466A (en) Ferrite sintered magnet
JPH11307331A (en) Ferrite magnet
JPH0725618A (en) Production of soft ferrite
JP2001068320A (en) Ferrite magnet
KR20050053081A (en) High performance ferrite sintered magnet and producing method of the same
JP2001006913A (en) Rotor
JPH0661029A (en) Manufacture of oxide permanent magnet

Legal Events

Date Code Title Description
A711 Notification of change in applicant

Free format text: JAPANESE INTERMEDIATE CODE: A712

Effective date: 20050609

A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20050829

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20051130

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20060120

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20070316

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20070323

R150 Certificate of patent or registration of utility model

Ref document number: 3936507

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150

Free format text: JAPANESE INTERMEDIATE CODE: R150

S111 Request for change of ownership or part of ownership

Free format text: JAPANESE INTERMEDIATE CODE: R313111

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20100330

Year of fee payment: 3

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20100330

Year of fee payment: 3

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110330

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120330

Year of fee payment: 5

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130330

Year of fee payment: 6

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20140330

Year of fee payment: 7

EXPY Cancellation because of completion of term