JPS6051244B2 - Sintered magnetic core with high coercive force - Google Patents
Sintered magnetic core with high coercive forceInfo
- Publication number
- JPS6051244B2 JPS6051244B2 JP15769781A JP15769781A JPS6051244B2 JP S6051244 B2 JPS6051244 B2 JP S6051244B2 JP 15769781 A JP15769781 A JP 15769781A JP 15769781 A JP15769781 A JP 15769781A JP S6051244 B2 JPS6051244 B2 JP S6051244B2
- Authority
- JP
- Japan
- Prior art keywords
- sintered
- coercive force
- density
- copper
- magnetic core
- 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.)
- Expired
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 21
- 239000010949 copper Substances 0.000 claims description 15
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 14
- 229910052802 copper Inorganic materials 0.000 claims description 14
- 229910052742 iron Inorganic materials 0.000 claims description 9
- 239000012535 impurity Substances 0.000 claims description 2
- 239000011148 porous material Substances 0.000 claims 1
- 230000004907 flux Effects 0.000 description 9
- 239000000463 material Substances 0.000 description 7
- 230000007423 decrease Effects 0.000 description 5
- IYRDVAUFQZOLSB-UHFFFAOYSA-N copper iron Chemical compound [Fe].[Cu] IYRDVAUFQZOLSB-UHFFFAOYSA-N 0.000 description 3
- 239000011162 core material Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 238000005245 sintering Methods 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 230000008595 infiltration Effects 0.000 description 2
- 238000001764 infiltration Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
- H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
- H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
- H01F1/032—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials
- H01F1/04—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys
- H01F1/06—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder
- H01F1/08—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together
- H01F1/086—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of hard-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together sintered
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Soft Magnetic Materials (AREA)
Description
【発明の詳細な説明】
この発明は、磁束密度と保持力のともに優れた焼結磁心
材料に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sintered magnetic core material that has excellent magnetic flux density and coercive force.
永久磁石のヨークとして用いられる焼結磁心の材料は通
常純鉄てあり、その特性は磁束密度氏５が１１〜１５Ｋ
Ｇ程度、保磁力Ｈｃが０．６〜２．５０ｅ程度のレベル
にある。The material of the sintered magnetic core used as the yoke of a permanent magnet is usually pure iron, and its characteristics include a magnetic flux density of 11 to 15K.
G, and the coercive force Hc is at a level of about 0.6 to 2.50e.
しかし、永久磁石のヨークの中には上記レベルの磁束密
度と、より大きな保磁力とを必要とする用途があり、材
質の改良が望まれていた。However, some permanent magnet yokes have applications that require the above-mentioned level of magnetic flux density and larger coercive force, and it has been desired to improve the material.
純鉄焼結材の保磁力を大きくするには、これに炭素また
は銅を加えるのが有効である。In order to increase the coercive force of pure iron sintered material, it is effective to add carbon or copper to it.
しかし、Ｆｅ−Ｃ系材料はその磁束密度が純鉄よりも低
いので、所期の目的に合わない。また、Ｆｅ−Ｃｕ系の
焼結合金は、その焼結時に「銅膨張」現象を生じて焼結
密度が低下し、それに伴い磁束密度も低下するため、こ
れを避ける工夫が必要となる。そこでこの発明は、鉄−
銅焼結材における銅の添加方法を通常の粉末混合から鉄
単味焼結体への銅溶浸に変え、焼結時の銅膨張を回避し
て所期の目的を達成したものである。第１図に示すよう
に、鉄−銅焼結材（点線）は銅含有率を増すにつれて保
磁力は大きくなるが、その反面、焼結時の膨張の影響で
焼結密度が低下するのに伴い磁束密度は小さくなる。However, Fe--C based materials have a lower magnetic flux density than pure iron, so they are not suitable for the intended purpose. In addition, Fe--Cu based sintered alloys undergo a "copper expansion" phenomenon during sintering, resulting in a decrease in sintered density and a corresponding decrease in magnetic flux density, so it is necessary to devise ways to avoid this. Therefore, this invention
The method of adding copper to the copper sintered material was changed from the usual powder mixing to copper infiltration into the single iron sintered body, thereby avoiding copper expansion during sintering and achieving the intended purpose. As shown in Figure 1, the coercive force of the iron-copper sintered material (dotted line) increases as the copper content increases, but on the other hand, the sintered density decreases due to the effect of expansion during sintering. Accordingly, the magnetic flux density becomes smaller.
しかるに、鉄単味の焼結体に銅を溶浸したもの（実線）
は、密度の増加は当然として、保磁力の向上度合いは前
者より優り、かつ磁束密度は殆んど純鉄のレベルを保つ
ていることがわかる。なお後者の試料は、焼結密度が６
．９５ｙｌｄのアトマイズ鉄粉の焼結体に、アンモニア
分解ガス炉中１１５０℃、３紛間の条件で所定量の銅を
溶浸したものであるが、純銅はもとより、添加剤入りの
市販の溶浸用銅を用いることもできる。However, a sintered body made of iron alone is infiltrated with copper (solid line).
It can be seen that in addition to the increase in density, the degree of improvement in coercive force is superior to the former, and the magnetic flux density is almost maintained at the level of pure iron. Note that the latter sample has a sintered density of 6
．． A 95yld atomized iron powder sintered body is infiltrated with a predetermined amount of copper in an ammonia decomposition gas furnace at 1150°C under three-powder conditions. It is also possible to use copper.
つぎに、第２図は焼結体の密度と磁気特性との関係を示
したもので、まず磁束密度Ｂ５についてみると、鉄単味
の焼結体そのままのもの（点線）と、その空孔に溶浸後
の密度が７．５〜７．７ｆｌｌｄになる量の銅を溶浸し
たもの（実線）とは前者が幾分か優るものの、焼結密度
の増加につれてほぼ同等の向上を示している。Next, Figure 2 shows the relationship between the density and magnetic properties of a sintered body. First, looking at the magnetic flux density B5, we can see that the sintered body made of iron alone (dotted line) and its voids Although the former is somewhat superior to the one in which copper is infiltrated in an amount that makes the density after infiltration 7.5 to 7.7fld (solid line), the improvement is almost the same as the sintered density increases. There is.
そしてこの発明の用途においては通常ＩＯＫＧ以上の性
能を求められるので、これを満足する焼結体の密度は６
．６ｙＩｄ以上となる。一方保磁力Ｈｃについてみると
、鉄単味焼結体（点線）、これに銅溶浸したもの（実線
）ともに密度の増加につれて漸減の傾向を示しているが
、この発明に係る後者の方が遥かに優れていることを一
見して明白てある。In the application of this invention, a performance higher than IOKG is usually required, so the density of the sintered body that satisfies this is 6.
．． 6yId or more. On the other hand, when looking at the coercive force Hc, both the single iron sintered body (dotted line) and the copper infiltrated body (solid line) show a tendency to gradually decrease as the density increases, but the latter according to this invention shows a tendency to gradually decrease as the density increases. It is obvious at first glance that it is far superior.
そして基材の密度を大きく・するほど製作費は急増し、
しかも肝心の保磁力は低下するので、磁束密度を考慮し
てもなお、焼結密度は７．４ｙＩｄを上限とするのが妥
当である。なお、焼結磁心には電解鉄粉、アトマイズ鉄
粉などの純度の高い原料を用いるのが通常であるが、不
純分があつても、１％以内の微量ならば実用上格別の不
利は生じない。As the density of the base material increases, the production cost increases rapidly.
Moreover, since the important coercive force is reduced, it is appropriate to set the upper limit of the sintered density to 7.4yId even when considering the magnetic flux density. It is common practice to use highly pure raw materials such as electrolytic iron powder and atomized iron powder for sintered magnetic cores, but even if there is impurity, if it is a trace amount of less than 1%, there will be a particular disadvantage in practical use. do not have.
第１図は鉄一銅焼結体の銅含有量と磁気特性との関係を
示すグラフ、第２図は鉄焼結体の密度と磁気特性との関
係を示すグラフである。FIG. 1 is a graph showing the relationship between the copper content and magnetic properties of an iron-copper sintered body, and FIG. 2 is a graph showing the relationship between the density and magnetic properties of the iron-copper sintered body.
Claims (1)
純分１％以下の純鉄焼結体の空孔内に銅が溶浸されてな
る保持力の大きい焼結磁心。1. A sintered magnetic core with high coercive force made by infiltrating copper into the pores of a pure iron sintered body with a sintered density of 6.6 to 7.4 g/cm^3 and an unavoidable impurity of 1% or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15769781A JPS6051244B2 (en) | 1981-10-03 | 1981-10-03 | Sintered magnetic core with high coercive force |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15769781A JPS6051244B2 (en) | 1981-10-03 | 1981-10-03 | Sintered magnetic core with high coercive force |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5858709A JPS5858709A (en) | 1983-04-07 |
| JPS6051244B2 true JPS6051244B2 (en) | 1985-11-13 |
Family
ID=15655400
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15769781A Expired JPS6051244B2 (en) | 1981-10-03 | 1981-10-03 | Sintered magnetic core with high coercive force |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6051244B2 (en) |
-
1981
- 1981-10-03 JP JP15769781A patent/JPS6051244B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5858709A (en) | 1983-04-07 |
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