JPS6050042B2 - Method for improving properties of magnetic alloy powder for magnetic recording - Google Patents
Method for improving properties of magnetic alloy powder for magnetic recordingInfo
- Publication number
- JPS6050042B2 JPS6050042B2 JP53008750A JP875078A JPS6050042B2 JP S6050042 B2 JPS6050042 B2 JP S6050042B2 JP 53008750 A JP53008750 A JP 53008750A JP 875078 A JP875078 A JP 875078A JP S6050042 B2 JPS6050042 B2 JP S6050042B2
- Authority
- JP
- Japan
- Prior art keywords
- alloy powder
- magnetic
- heat treatment
- magnetic recording
- temperature
- 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
- 239000000843 powder Substances 0.000 title claims description 25
- 238000000034 method Methods 0.000 title claims description 9
- 229910001004 magnetic alloy Inorganic materials 0.000 title claims description 5
- 238000010438 heat treatment Methods 0.000 claims description 21
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 8
- 239000001301 oxygen Substances 0.000 claims description 8
- 229910052760 oxygen Inorganic materials 0.000 claims description 8
- 229910001030 Iron–nickel alloy Inorganic materials 0.000 claims description 3
- 238000001704 evaporation Methods 0.000 claims description 3
- 229910020630 Co Ni Inorganic materials 0.000 claims description 2
- 229910002440 Co–Ni Inorganic materials 0.000 claims description 2
- 230000008020 evaporation Effects 0.000 claims description 2
- 239000011261 inert gas Substances 0.000 claims 1
- 229910045601 alloy Inorganic materials 0.000 description 14
- 239000000956 alloy Substances 0.000 description 14
- 230000000694 effects Effects 0.000 description 7
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 4
- 238000011282 treatment Methods 0.000 description 4
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 229910000531 Co alloy Inorganic materials 0.000 description 2
- 229910017061 Fe Co Inorganic materials 0.000 description 2
- 229910000990 Ni alloy Inorganic materials 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 229910001566 austenite Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000006247 magnetic powder Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
Landscapes
- Paints Or Removers (AREA)
- Powder Metallurgy (AREA)
- Magnetic Record Carriers (AREA)
- Hard Magnetic Materials (AREA)
Description
【発明の詳細な説明】
本発明は磁気記録用磁性合金粉末の特性改善方法に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for improving the characteristics of magnetic alloy powder for magnetic recording.
現在、一般に用いられている磁気記録用粉末には、γ−
Ｆｅ。Currently, magnetic recording powders commonly used include γ-
Fe.
Ｏ。、Ｃｏ添加型酸化鉄、ＣｒＯ。等がある。これらは
いずれも、保持力Ｈｃが３００〜７００エルステッドで
、残留磁束密度Ｂｒが３５００〜５０００ガウス位であ
る。高密度磁気記録用粉末としては、さらにＨｃの大き
な磁気粉末として、Ｈｃが１０００エルステッド以上で
、かつ高Ｂｒ材たとえば７５００ガウス以上のものが求
められている。現在用いらているγ−Ｆｅ。Ｏ。、Ｃｏ
添加型酸化鉄、ＣｒＯ。等の酸化物粉末では、たとえば
Ｈｃを高めることができたとしても、本質的に飽和磁気
が小さいために、上述の条件を満足させることがむずカ
ルい。このような目的には、従来、飽和磁気が高いＦｅ
−Ｃｏ系などの合金粉末を用い、その粒径や形状をコン
トロールし、形状異方性、結晶異方性等を利用して、よ
り高いＨｃを得るための方法が種々検討され、開発され
ている。本発明は、現在開発されているＦｅ−Ｃｏ系、
Ｆｅ−Ｎｉ系Ｃｏ−Ｎｉ系合金粉末の特性改善に関する
ものであり、これらの合金粉末を、２００〜５００℃の
範囲内の温度で熱処理することを特徴とし、Ｈｃを高く
すると同時にＢｒも高めることにより、より高性能の磁
気記録用合金粉末を製造することのてきる方法である。O. , Co-added iron oxide, CrO. etc. All of these have a coercive force Hc of 300 to 700 Oe and a residual magnetic flux density Br of about 3500 to 5000 Gauss. As a powder for high-density magnetic recording, there is a demand for a magnetic powder with a high Hc of 1000 Oe or more and a high Br material, for example, 7500 Gauss or more. γ-Fe currently used. O. ,Co
Additive iron oxide, CrO. For example, even if Hc can be increased with oxide powders such as oxide powders, it is difficult to satisfy the above conditions because the saturation magnetism is essentially small. Conventionally, Fe, which has high saturation magnetism, has been used for such purposes.
- Various methods have been studied and developed to obtain higher Hc by controlling the particle size and shape of alloy powders such as Co-based alloys, and by utilizing shape anisotropy, crystal anisotropy, etc. There is. The present invention is based on the currently developed Fe-Co system,
It relates to improving the properties of Fe-Ni-based Co-Ni-based alloy powders, and is characterized by heat-treating these alloy powders at a temperature within the range of 200 to 500°C to increase Hc and Br at the same time. This method makes it possible to produce a higher performance alloy powder for magnetic recording.
この熱処理を酸素圧（２〜１００）×１０−０気圧の酸
化性雰囲気中において１００〜３００エルステッドの外
部磁場中で熱処理をすると効果があり、またこれら熱処
理をＦｅ−Ｎｉ系合金粉末、Ｃｏ−Ｎｉ系合金粉末、２
０〜６０原子のＣｏを含むＦｅ−Ｃｏ系合金粉末に対し
て施して効果がある。これらの熱処理における保持温度
としては、ノ２００〜５０００Ｃが適当であり、保温時
間も３紛以内で充分であることが実験により認められた
。It is effective to perform this heat treatment in an oxidizing atmosphere of oxygen pressure (2 to 100) x 10-0 atm in an external magnetic field of 100 to 300 oersteds. Ni-based alloy powder, 2
It is effective when applied to Fe-Co alloy powder containing 0 to 60 atoms of Co. It has been found through experiments that a holding temperature of 200 to 5,000 C is appropriate for these heat treatments, and a temperature keeping time of 3 powders or less is sufficient.
あまり長時間熱処理すると、合金粉末の焼結が進みすぎ
る。処理温度が５００’Ｃより高くなると合金粉末の酸
化と焼結が激しくなる。いずれの場合もＢｒが低下し、
極端な場合には、Ｈｃの値が大巾に小さくなる。処理温
度が２００℃より、低くなると、本発明の熱処理による
効果が乏しくなる。熱処理温度が２００〜５００゜Ｃで
あるときには、熱処理による効果のいちぢるしいことが
認められた。熱処理雰囲気を構成する酸素の圧力が２×
１０−６気圧程度では、昇温速度を約１００℃／時とす
ることもできる。ところが、酸素圧をあまり高くすると
、昇温速度によつては、試料の合金粉末が燃えてしまう
おそれもあり、昇温にあたり十分注意しなければならな
い。酸素圧が１００Ｘ１０−６気圧までの酸化雰囲気で
は安定的に、本発明の効果が認められた。また、酸素圧
が２刈０−６気圧よりも低くなると、熱処理による効果
が乏しくなる。このようなことから、雰囲気は（２×１
００）×１０−６気圧の酸素で構成されていることが望
ましい。磁場中熱処理による効果は、外部磁場が１００
エルステッド以上あれば効果があり、外部磁場が高い程
、処理後のＨｃは高くなる。If the heat treatment is performed for too long, the sintering of the alloy powder will proceed too much. When the treatment temperature is higher than 500'C, the oxidation and sintering of the alloy powder becomes intense. In both cases, Br decreases,
In extreme cases, the value of Hc becomes significantly small. When the treatment temperature is lower than 200° C., the effect of the heat treatment of the present invention becomes poor. When the heat treatment temperature was 200 to 500°C, it was observed that the effect of the heat treatment was significant. The pressure of oxygen constituting the heat treatment atmosphere is 2×
At about 10 −6 atmospheres, the temperature increase rate can be about 100° C./hour. However, if the oxygen pressure is made too high, depending on the rate of temperature rise, there is a risk that the alloy powder in the sample will burn, so sufficient care must be taken when raising the temperature. The effects of the present invention were stably observed in an oxidizing atmosphere with an oxygen pressure of up to 100×10 −6 atmospheres. Further, when the oxygen pressure is lower than 0-6 atm, the effect of heat treatment becomes poor. For this reason, the atmosphere is (2×1
00) x 10-6 atmospheres of oxygen. The effect of heat treatment in a magnetic field is that the external magnetic field is 100%
It is effective if it is Oersted or higher, and the higher the external magnetic field, the higher the Hc after treatment.
３０００エルステッドより高くなると、Ｈｃの高められ
る割合が小さくなつてくるので、実際には上限が５００
０エルステッド以下であることが望ましいと考えられる
。If it goes higher than 3000 oersteds, the rate at which Hc is increased becomes smaller, so the upper limit is actually 500 oersteds.
It is considered desirable that it be 0 oersted or less.
本発明の熱処理は、一度に多量の試料を、簡単に処理す
ることができ、それによつて高いＨｃとＢｒの合金粉末
が得られるという特長を持つてい，る。そして、この熱
処理の結果として、表面に形成された薄い酸化皮膜によ
り内部が保護されるため、その後の特性の経時変化が少
ない。特に磁場中熱処理することにより、さらに、Ｈｅ
とＢｒを向上させることができ、一層有効であｊる。The heat treatment of the present invention has the advantage that a large amount of samples can be easily treated at one time, and thereby an alloy powder with high Hc and Br can be obtained. As a result of this heat treatment, the inside is protected by a thin oxide film formed on the surface, so that subsequent changes in characteristics over time are small. In particular, by heat treatment in a magnetic field, He
and Br, which is even more effective.
本発明の熱処理中磁場処理の効果は、Ｆｅ−ＣＯ合金で
はＣＯの２０〜６０原子％の領域で有効で、最適の合金
は、Ｆｅ５Ｏ％−ＣＯ５Ｏ％である。The effect of the magnetic field treatment during heat treatment of the present invention is effective in the range of 20 to 60 atomic % of CO in the Fe--CO alloy, and the optimum alloy is Fe5O%-CO5O%.
一方熱処理の際に磁場を印加しない方法では、熱処理に
よるＨｃの向上は、ＣＯが２０〜８０原子％で有効であ
る。本発明の方法による磁気特性の向上は、ＣＯで２０
〜６０原子％のＦｅ−ＣＯ系合金粉末で有効である。On the other hand, in a method in which no magnetic field is applied during heat treatment, improvement in Hc by heat treatment is effective when CO is 20 to 80 atomic %. The improvement of magnetic properties by the method of the present invention can be achieved by CO20
It is effective with Fe-CO alloy powder containing up to 60 atomic %.
同様に、Ｆｅ−Ｎｉ系、ＣＯ−Ｎｉ系合金粉末について
もやははり同じ効果が得られる。以下、本発明の方法に
ついて実施例をあげて説明する。Similarly, the same effect can be obtained with Fe--Ni alloy powder and CO--Ni alloy powder. Hereinafter, the method of the present invention will be explained by giving examples.
ｌ実施例１アルゴンガス中で蒸発させて製造したＦｅ５
Ｏ％−ＣＯ５Ｏ％の合金粉末を２×１０−６気圧の酸素
中に保持されるよう封入したものを、電気炉に入れ、ほ
ぼ１００℃／時のゆつくりとした速度で昇温し、３５０
℃で３吟保持した、それから試料を徐冷し、室温まで低
下してから、封入した試料を封入したままで、電気炉か
ら取り出し、封入した状態で振動式磁力計を用いて、Ｂ
−Ｈループを測定した。l Example 1 Fe5 produced by evaporation in argon gas
O%-CO5O% alloy powder sealed in oxygen at 2 x 10-6 atmospheres was placed in an electric furnace, heated at a slow rate of approximately 100°C/hour, and heated to 350°C.
The sample was kept at ℃ for 3 minutes, and then the sample was slowly cooled down to room temperature, and then the sealed sample was taken out of the electric furnace, and the sealed sample was measured using a vibrating magnetometer.
-H loop was measured.
その結を第１表に示す。実施例２
実施例１と同様にして、試料を封入し、電気炉にて、３
５０℃まで昇温してから、３５０℃の温度て外部磁場１
００エルステッドをかけて、３０分保持した。The results are shown in Table 1. Example 2 In the same manner as in Example 1, a sample was sealed and heated in an electric furnace for 3
After increasing the temperature to 50℃, apply an external magnetic field 1 at a temperature of 350℃.
00 oersted and held for 30 minutes.
それから室温にまで徐冷し、その後試料を電気炉から取
り出し、磁気測定をした。結果を第２表に示す。実施例
３
蒸発法でＦｅ−ＣＯ系、Ｆｅ−Ｎｉ系およびＣＯ−Ｎｉ
系の合金粉末を製造したものを、実施例１と同様に熱処
理し、熱処理前後の磁気特性を測定した。The sample was then slowly cooled to room temperature, and then taken out of the electric furnace and subjected to magnetic measurements. The results are shown in Table 2. Example 3 Fe-CO system, Fe-Ni system and CO-Ni system by evaporation method
The produced alloy powder of the system was heat treated in the same manner as in Example 1, and the magnetic properties before and after the heat treatment were measured.
熱処理の温度、保持時間、磁場の強さとＨｃの熱処理前
後での改良の割合は、第３表のとおりである。上表の結
果から明らかなようにいずれの試料も熱処理によるＨｃ
の改善がいちぢるしく、またＢｒも熱処理によつて改善
されていることがわかる。The heat treatment temperature, holding time, magnetic field strength, and improvement ratio of Hc before and after the heat treatment are shown in Table 3. As is clear from the results in the table above, all samples have reduced Hc due to heat treatment.
It can be seen that the improvement in Br is significant and that Br is also improved by the heat treatment.
Claims (1)
たはＣｏ−Ｎｉ系の磁性合金粉末を（２〜１００）×１
０＾−＾６気圧の酸素中において２００〜５００℃の範
囲内の温度で熱処理することを特徴とする磁気記録用磁
性合金粉末の特性改善法。 ２ １００〜３０００エルステッドの磁場中において熱
処理することを特徴とする特許請求の範囲第１項記載の
磁気記録用磁性合金粉末の特性改善法。[Claims] 1 Fe-Ni-based or Co-Ni-based magnetic alloy powder prepared by evaporation in an inert gas (2 to 100) x 1
A method for improving the characteristics of a magnetic alloy powder for magnetic recording, characterized by heat treatment at a temperature within the range of 200 to 500° C. in oxygen at 0^-^6 atmospheres. 2. A method for improving the characteristics of a magnetic alloy powder for magnetic recording according to claim 1, characterized in that it is heat-treated in a magnetic field of 100 to 3,000 oersteds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP53008750A JPS6050042B2 (en) | 1978-01-27 | 1978-01-27 | Method for improving properties of magnetic alloy powder for magnetic recording |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP53008750A JPS6050042B2 (en) | 1978-01-27 | 1978-01-27 | Method for improving properties of magnetic alloy powder for magnetic recording |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS54102599A JPS54102599A (en) | 1979-08-13 |
| JPS6050042B2 true JPS6050042B2 (en) | 1985-11-06 |
Family
ID=11701597
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP53008750A Expired JPS6050042B2 (en) | 1978-01-27 | 1978-01-27 | Method for improving properties of magnetic alloy powder for magnetic recording |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6050042B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6090702U (en) * | 1983-11-28 | 1985-06-21 | 富士重工業株式会社 | Lamp mounting structure |
-
1978
- 1978-01-27 JP JP53008750A patent/JPS6050042B2/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6090702U (en) * | 1983-11-28 | 1985-06-21 | 富士重工業株式会社 | Lamp mounting structure |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS54102599A (en) | 1979-08-13 |
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