JPS63186402A - Ferrite magnet - Google Patents
Ferrite magnetInfo
- Publication number
- JPS63186402A JPS63186402A JP62018844A JP1884487A JPS63186402A JP S63186402 A JPS63186402 A JP S63186402A JP 62018844 A JP62018844 A JP 62018844A JP 1884487 A JP1884487 A JP 1884487A JP S63186402 A JPS63186402 A JP S63186402A
- Authority
- JP
- Japan
- Prior art keywords
- cr2o3
- al2o3
- ferrite magnet
- sio2
- cao
- 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
Links
- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 27
- 239000000203 mixture Substances 0.000 claims abstract description 13
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 abstract description 20
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 18
- 239000013078 crystal Substances 0.000 abstract description 11
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 abstract description 10
- 229910052593 corundum Inorganic materials 0.000 abstract description 10
- 229910001845 yogo sapphire Inorganic materials 0.000 abstract description 10
- 229910052681 coesite Inorganic materials 0.000 abstract description 9
- 229910052906 cristobalite Inorganic materials 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 9
- 239000000377 silicon dioxide Substances 0.000 abstract description 9
- 235000012239 silicon dioxide Nutrition 0.000 abstract description 9
- 229910052682 stishovite Inorganic materials 0.000 abstract description 9
- 229910052905 tridymite Inorganic materials 0.000 abstract description 9
- 230000004907 flux Effects 0.000 abstract description 7
- 230000006872 improvement Effects 0.000 abstract description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 abstract description 4
- 238000005245 sintering Methods 0.000 abstract description 4
- 238000000034 method Methods 0.000 abstract description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 abstract 6
- 230000007423 decrease Effects 0.000 description 7
- 239000000654 additive Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 4
- BYFGZMCJNACEKR-UHFFFAOYSA-N aluminium(i) oxide Chemical compound [Al]O[Al] BYFGZMCJNACEKR-UHFFFAOYSA-N 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000006104 solid solution Substances 0.000 description 2
- -1 0.3wt% to 1.0wt% Chemical compound 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 238000004040 coloring Methods 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 230000005381 magnetic domain Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
Landscapes
- Compounds Of Iron (AREA)
- Magnetic Ceramics (AREA)
- Hard Magnetic Materials (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
この発明は、高性能フェライト磁石の改良に係り、特に
、残留磁束密度を低下させることなく、高１呆磁力を確
保したフェライト磁石に関する。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to improvements in high-performance ferrite magnets, and in particular to ferrite magnets that ensure high magnetic force without reducing residual magnetic flux density.
従来技術とその問題点
一般にフェライト磁石は磁気特性が高く、安価な原料よ
り得られる経済的利点があるため、電子機器等に広く用
いられているが、電子機器の小型化、高性能化の転換が
進められる中で、残留磁束密度（Ｂｒ）及び保磁力（ｉ
Ｈｃ）が共に高い高性能磁石が強く要望されている。Conventional technology and its problems In general, ferrite magnets have high magnetic properties and economical advantages obtained from inexpensive raw materials, so they are widely used in electronic devices, etc. However, due to the shift to smaller size and higher performance of electronic devices, As the process progresses, the residual magnetic flux density (Br) and coercive force (i
There is a strong demand for high-performance magnets with high Hc).
従来より、フェライト磁石において、残留磁束密度を向
上させるためには、結晶のＩｓを高めること、焼結体の
密度及び結晶の配向度を高めることがよく知られており
、また保磁力については単磁区結晶の存在率を高めるこ
とが必要とされてきた。Conventionally, in order to improve the residual magnetic flux density in ferrite magnets, it has been well known that increasing the Is of the crystal, increasing the density of the sintered body, and increasing the orientation of the crystal, and that the coercive force is simply There has been a need to increase the abundance of magnetic domain crystals.
そこで、フェライト磁石の高性能化のため、フェライト
磁石の組成、添加物及び製造条件について、種々検討が
なされ、種々の用途に応じて、各種フェライトの基本組
成を有するフェライト磁石が開発されてきたが、かがる
組成の磁石は焼結体のため、前記焼結体の密度を高める
と結晶の成長を助長し、ＢｒとｉＨｃを同時に向上させ
ることは極めて困難であった。Therefore, in order to improve the performance of ferrite magnets, various studies have been conducted on the composition, additives, and manufacturing conditions of ferrite magnets, and ferrite magnets with basic compositions of various ferrites have been developed according to various uses. Since a magnet with a composition such as , or dark is a sintered body, increasing the density of the sintered body promotes crystal growth, making it extremely difficult to simultaneously improve Br and iHc.
また、添加物のうち、ＣａＯ及びＳｉＯ２は、フェライ
ト磁石の液相焼結を助長して、その添加量によリ、焼結
密度及び結晶粒の大きさを制御する効果があり、また、
Ａｌ２Ｏ３及びＣｒ２Ｏ３はフェライト結晶粒の成長を
ｉしく抑制して、保磁力の向上に有効であるが、焼結体
の密度低下及びフェライト結晶との固溶体を形成して、
残留磁束密度の低下を招来するため、前記添加物の添加
量はそれぞれ要求される性能に応じて適宜選定されてい
た。Among the additives, CaO and SiO2 promote liquid phase sintering of ferrite magnets, and have the effect of controlling the sintered density and crystal grain size depending on the amount added.
Al2O3 and Cr2O3 are effective in suppressing the growth of ferrite crystal grains and improving coercive force, but they reduce the density of the sintered body and form a solid solution with ferrite crystals.
In order to reduce the residual magnetic flux density, the amount of each additive added has been appropriately selected depending on the required performance.
しかし、従来は、前記添加物のみでは、フェライト磁石
のＢｒの低下とｉＨｃの向上とのバランスを大きく変化
させることができないため、前記添加物め添加時期等の
製造条件を改良することにより、ＢｒとｉＨｃを同時に
向上させるべく対処されてきた。従って、要求される磁
石性能に応じてフェライト磁石の製造工程や条件などを
選定するため、製造工程が繁雑となり、コスト上昇を招
来する問題があった。However, conventionally, the balance between the reduction in Br and the improvement in iHc of a ferrite magnet cannot be greatly changed by using only the additives, so by improving the manufacturing conditions such as the timing of adding the additives, Measures have been taken to simultaneously improve iHc and iHc. Therefore, since the manufacturing process and conditions of the ferrite magnet are selected depending on the required magnet performance, the manufacturing process becomes complicated, leading to an increase in costs.
発明の目的
この発明は、残留磁束密度を低下させることなく、高保
磁力を確保した高性能な高磁束密度、高保磁カフエライ
ト磁石を目的としている。Object of the Invention The object of the present invention is to provide a high-performance, high-flux-density, high-coercivity kaphelite magnet that ensures high coercive force without reducing residual magnetic flux density.
発明の構成と効果
−本発明者らは、上述したフェライト磁石の基本組成に
お□ける添加物について、Ｂｒを低下させずにｉＨｃを
向上させる添加物を目的に、種々検討した結果、特定モ
ル比を有する基本組成のフェライト磁石に、特定量のＣ
ａＯ１Ｓｉ０２と、Ｃｒ２Ｏ３またはＡｌ２Ｏ３の１種
または２種と共に、特定量のＣｏｏを含有させることに
より、Ｂｒの低下がなく、ｉＨｃが大きく向上した高性
能フェライト磁石が得られることを知見し、この発明を
完成したものである。Structure and Effects of the Invention - The present inventors have conducted various studies regarding the additives in the basic composition of the ferrite magnet described above, with the aim of improving iHc without reducing Br. A specific amount of C is added to a ferrite magnet with a basic composition of
It was discovered that by containing a specific amount of Coo together with aO1Si02 and one or two of Cr2O3 or Al2O3, a high-performance ferrite magnet with no decrease in Br and greatly improved iHc could be obtained, and the present invention was realized. It is completed.
すなわち、この発明は、
モル比Ｆｅ２ｅｓ ／ ＭＯ（但しＭはＰｂ、 Ｂａ、
Ｓｒのうち少 −なくとも１種）が５．０〜６．
２なる基本組成を有するフェライト磁石において、
ＣａＯＯ，２ｗｔ％〜１．０ｗｔ％、
ＳｉＯ２０．３ｗｔ％〜１．０ｗｔ％に、Ｃｒ２Ｏ３、
Ａｌ２Ｏ３の１種または２種を０．０５ｗｔ％〜５−０
ｗｔ％と、
Ｃｏ００．０５ｗｔ％〜１．５ｗｔ％を含有することを
特徴とするフェライト磁石である。That is, this invention has the following molar ratio Fe2es/MO (where M is Pb, Ba,
(at least one type of Sr) is 5.0 to 6.
In a ferrite magnet having a basic composition of 2, CaOO, 2wt% to 1.0wt%, SiO2, 0.3wt% to 1.0wt%, Cr2O3,
0.05wt% to 5-0 of one or two types of Al2O3
It is a ferrite magnet characterized by containing 0.05 wt% to 1.5 wt% of Co.
組成の限定理由
この発明において、基本組成のＦｅ２Ｏ３／ ＭＯ（但
しＭはＰｂ、 Ｂａ、 Ｓｒのうち少なくとも１種）モ
ル比が、５．０未満並びに６．２を超える場合、結晶の
件が低下するため、磁気特性が低下して、実用的に不適
となるので好ましくなく、
Ｆｅ２Ｏ３／ＭＯモル比は５．０〜６．２とする。Reason for limiting the composition In this invention, if the basic composition Fe2O3/MO (M is at least one of Pb, Ba, and Sr) molar ratio is less than 5.0 or more than 6.2, the crystal quality will be reduced. As a result, the magnetic properties deteriorate and become unsuitable for practical use, which is not preferable, and the Fe2O3/MO molar ratio is set to 5.0 to 6.2.
ＣａＯ及びＳｉＯ２は、焼結密度及び結晶粒の大きさを
制御する効果があるため添加するが、ＣａＯが０．２ｗ
ｔ％未満、８ｉ０２が０．３ｗｔ％未満では、焼結時に
不均一な粒成長が起こり、ｉＨｃの低下を招来する。ま
た、ＣａＯが１．Ｑｗｔ％を超え、ＳｉＯ２が１．０ｗ
ｔ％を越えると、磁石内の非磁性相が増加し、Ｂｒの低
下を招来するので好ましくない。よって、ＣａＯ０，２
ｗｔ％〜１．０ｗｔ％、ＳｉＯ２０．３ｗｔ％〜１．０
ｗｔ％とする。CaO and SiO2 are added because they have the effect of controlling the sintered density and crystal grain size, but when CaO is added at 0.2 w
If 8i02 is less than 0.3 wt%, non-uniform grain growth occurs during sintering, resulting in a decrease in iHc. Moreover, CaO is 1. Exceeds Qwt%, SiO2 is 1.0w
If it exceeds t%, the non-magnetic phase in the magnet will increase, resulting in a decrease in Br, which is not preferable. Therefore, CaO0,2
wt%~1.0wt%, SiO20.3wt%~1.0
Let it be wt%.
Ｃｒ２Ｏ３、Ａｌ２Ｏ３の添加はｉＨｃ向上に特に有効
であるが、かかる効果を得るにはそれぞれ少な（とも０
．０５ ｗｔ％の添加が必要であり、添加量の増加に伴
って、焼結密度の低下、フェライト磁石との固溶反応に
より、結晶のＩｓの低下が起るためＢｒが低下し、また
、５．０ｗｔ％を超える添加ではＢｒの低下が著しく実
用的に不適である。よって、Ｃｒ２Ｏ３、Ａｌ２Ｏ３の
添加は、それぞれ０．０５ ｗｔ％〜５．０ｗｔ％とす
る。The addition of Cr2O3 and Al2O3 is particularly effective in improving iHc, but in order to obtain such an effect, a small amount of each (both 0 and 0) is required.
．． It is necessary to add 0.5 wt%, and as the amount added increases, the sintered density decreases and the Is of the crystal decreases due to solid solution reaction with the ferrite magnet, resulting in a decrease in Br. Addition of more than 0.0 wt% causes a significant decrease in Br, making it unsuitable for practical use. Therefore, the addition of Cr2O3 and Al2O3 is set at 0.05 wt% to 5.0 wt%, respectively.
Ｃｏｏは、Ｃａｂ、 ＳｉＯ２、Ｃｒ２Ｏ３、Ａｌ２Ｏ
３の共存下でｉＨｃの向上に著しい効果を有するが、０
．０５ｗｔ％未満ではその効果が少なく、また１、５ｗ
ｔ％を超えると特性向上の効果が胞和するので好ましく
ない。Coo is Cab, SiO2, Cr2O3, Al2O
3 has a remarkable effect on improving iHc, but 0
．． If it is less than 0.05wt%, the effect will be small, and if it is less than 1.5wt%, the effect will be small.
If it exceeds t%, the effect of improving properties will be diminished, which is not preferable.
実施例
Ｆｅ２Ｏ３／ＳｒＯのモル比５．８の基本組成を有する
フェライト磁石になる如く、原料粉末を１２７０℃で１
時間の仮焼、粉砕後、第１表に示した磁石組成になる如
＜、ＣａＯ，ＳｉＯ２．０ｒ２０３、Ａｌ２Ｏ３、Ｃｏ
ｏを配合、混合後、微粉砕して、平均粒度０．７ｐｍの
微粉末にした後、１２ＫＯｅの磁場中にて、成彩圧０．
５Ｔ７ｃｍ２にて寸法Φ４０ｘｌＯｍｍの成形体を得た
後、大気［１月こて１２４０℃にＩＨｒの焼結条件にて
焼結した後、焼結体の密度、磁気特性を測定してその結
果を第１表に表す。Example: To obtain a ferrite magnet having a basic composition with a molar ratio of Fe2O3/SrO of 5.8, raw material powder was heated at 1270°C.
After several hours of calcination and pulverization, the magnet composition shown in Table 1 is as follows: CaO, SiO2.0r203, Al2O3, Co
After blending and mixing o, it was finely pulverized to a fine powder with an average particle size of 0.7 pm, and then in a magnetic field of 12 KOe at a coloring pressure of 0.
After obtaining a molded body with dimensions Φ40xlOmm using 5T7cm2, it was sintered in the atmosphere [January] using a trowel at 1240℃ under IHr sintering conditions, and the density and magnetic properties of the sintered body were measured and the results were reported. It is shown in Table 1.
第１表より明らかな如く、この発明によるフェライト磁
石はＢｒの低下させることなく、高保磁力が得られてい
ることが明らかである。As is clear from Table 1, it is clear that the ferrite magnet according to the present invention has a high coercive force without reducing Br.
Claims (1)
ｒのうち少なくとも１種）が５．０〜６．２なる基本組
成を有するフェライト磁石において、 ＣａＯ０．２ｗｔ％〜１．０ｗｔ％、ＳｉＯ＿２０．３
ｗｔ％〜１．０ｗｔ％に、Ｃｒ＿２Ｏ＿３、Ａｌ＿２Ｏ
＿３の１種または２種を０．０５ｗｔ％〜５．０ｗｔ％
と ＣｏＯ０．０５ｗｔ％〜１．５ｗｔ％を含有することを
特徴とするフェライト磁石。[Claims] 1 molar ratio Fe_2O_3/MO (where M is Pb, Ba, S
In a ferrite magnet having a basic composition in which at least one of r) is 5.0 to 6.2, CaO0.2wt% to 1.0wt%, SiO_20.3
wt% to 1.0wt%, Cr_2O_3, Al_2O
_0.05wt% to 5.0wt% of one or two types of 3
A ferrite magnet characterized by containing 0.05 wt% to 1.5 wt% of CoO.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62018844A JPS63186402A (en) | 1987-01-28 | 1987-01-28 | Ferrite magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62018844A JPS63186402A (en) | 1987-01-28 | 1987-01-28 | Ferrite magnet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63186402A true JPS63186402A (en) | 1988-08-02 |
| JPH0542128B2 JPH0542128B2 (en) | 1993-06-25 |
Family
ID=11982867
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62018844A Granted JPS63186402A (en) | 1987-01-28 | 1987-01-28 | Ferrite magnet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63186402A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6419847B1 (en) | 1998-11-26 | 2002-07-16 | Sumitomo Special Metals Co., Ltd. | Ferrite magnet powder and magnet using said magnet powder, and method for preparing them |
| US6478982B1 (en) | 1999-11-08 | 2002-11-12 | Sumitomo Special Metals Co. Ltd. | Ferrite magnet powder and magnet using the magnet powder, and method for preparing them |
| US6902685B2 (en) | 2001-05-24 | 2005-06-07 | Neomax Co., Ltd. | Oxide magnetic material |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57145034A (en) * | 1981-03-02 | 1982-09-07 | Magune Kk | Cleavable magnetic iron oxide and its production |
| JPS6191017A (en) * | 1984-07-25 | 1986-05-09 | エマン・ユジマツグ・エス・ア− | Oxide base anisotropic magnetic substance for permanent magnet |
-
1987
- 1987-01-28 JP JP62018844A patent/JPS63186402A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57145034A (en) * | 1981-03-02 | 1982-09-07 | Magune Kk | Cleavable magnetic iron oxide and its production |
| JPS6191017A (en) * | 1984-07-25 | 1986-05-09 | エマン・ユジマツグ・エス・ア− | Oxide base anisotropic magnetic substance for permanent magnet |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6419847B1 (en) | 1998-11-26 | 2002-07-16 | Sumitomo Special Metals Co., Ltd. | Ferrite magnet powder and magnet using said magnet powder, and method for preparing them |
| US6478982B1 (en) | 1999-11-08 | 2002-11-12 | Sumitomo Special Metals Co. Ltd. | Ferrite magnet powder and magnet using the magnet powder, and method for preparing them |
| US6902685B2 (en) | 2001-05-24 | 2005-06-07 | Neomax Co., Ltd. | Oxide magnetic material |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0542128B2 (en) | 1993-06-25 |
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