JPH0689366B2 - Magnetic powder for electromagnetic clutch - Google Patents
Magnetic powder for electromagnetic clutchInfo
- Publication number
- JPH0689366B2 JPH0689366B2 JP61102394A JP10239486A JPH0689366B2 JP H0689366 B2 JPH0689366 B2 JP H0689366B2 JP 61102394 A JP61102394 A JP 61102394A JP 10239486 A JP10239486 A JP 10239486A JP H0689366 B2 JPH0689366 B2 JP H0689366B2
- Authority
- JP
- Japan
- Prior art keywords
- weight
- powder
- electromagnetic clutch
- magnetic powder
- torque
- 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 - Fee Related
Links
- 239000006247 magnetic powder Substances 0.000 title claims description 29
- 239000000843 powder Substances 0.000 claims description 34
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 150000002910 rare earth metals Chemical class 0.000 claims description 7
- 238000009689 gas atomisation Methods 0.000 claims description 6
- 239000012535 impurity Substances 0.000 claims description 4
- 230000003647 oxidation Effects 0.000 description 21
- 238000007254 oxidation reaction Methods 0.000 description 21
- 230000000694 effects Effects 0.000 description 10
- 230000004907 flux Effects 0.000 description 8
- 229910052804 chromium Inorganic materials 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000002441 X-ray diffraction Methods 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 239000000956 alloy Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 229910000599 Cr alloy Inorganic materials 0.000 description 2
- 229910017061 Fe Co Inorganic materials 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 229910052726 zirconium Inorganic materials 0.000 description 2
- 101100404912 Caenorhabditis elegans nob-1 gene Proteins 0.000 description 1
- 229910052684 Cerium Inorganic materials 0.000 description 1
- 229910000531 Co alloy Inorganic materials 0.000 description 1
- 229910017060 Fe Cr Inorganic materials 0.000 description 1
- 229910002544 Fe-Cr Inorganic materials 0.000 description 1
- 229910001122 Mischmetal Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- UPHIPHFJVNKLMR-UHFFFAOYSA-N chromium iron Chemical compound [Cr].[Fe] UPHIPHFJVNKLMR-UHFFFAOYSA-N 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- -1 for example Inorganic materials 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
Landscapes
- Powder Metallurgy (AREA)
- Soft Magnetic Materials (AREA)
Description
【発明の詳細な説明】 ［発明の利用分野］ 本発明は電磁クラッチ用磁性粉体に関し、更に詳細に説
明すると、本発明は、磁性粉体を励磁コイルにより磁化
することにより、その磁性粉体粒子間に働く磁気的結合
力を利用した回転力を伝達させる、いわゆる電磁クラッ
チに用いて好適な電磁クラッチ用磁性粉体に係る。Description: FIELD OF THE INVENTION The present invention relates to a magnetic powder for electromagnetic clutches. More specifically, the present invention relates to magnetic powder by magnetizing the magnetic powder with an exciting coil. The present invention relates to a magnetic powder for an electromagnetic clutch, which is suitable for use in a so-called electromagnetic clutch, which transmits a rotational force using a magnetic coupling force acting between particles.
［従来技術］ 電磁クラッチ用の磁性粉体には数々の特性が求められ
る。なかでも透磁率、飽和磁束密度などの磁気的特性及
び耐酸化性、耐摩耗性などの機械的性質が重要である。[Prior Art] Magnetic powders for electromagnetic clutches are required to have various characteristics. Among them, magnetic properties such as magnetic permeability and saturation magnetic flux density, and mechanical properties such as oxidation resistance and wear resistance are important.
電磁クラッチの使用中に酸化あるいは摩耗により微粉が
発生すると、トルクが低下する。このため長期にわたっ
て安定したトルク特性を得るためには、微粉の発生を少
ない耐酸化性、耐摩耗性に優れた磁性粉体を使用するこ
とが必要である。If fine powder is generated due to oxidation or wear during the use of the electromagnetic clutch, the torque will decrease. Therefore, in order to obtain a stable torque characteristic for a long period of time, it is necessary to use a magnetic powder that is excellent in oxidation resistance and wear resistance with less generation of fine powder.
近年、電磁クラッチの小型化の要求が強く出されてお
り、磁性粉体の使用量も少なくなるために、より飽和磁
束密度の高い磁性粉体、すなわち同一電流を流した時に
より高いトルクの得られる磁性粉体が求められている。In recent years, there has been a strong demand for miniaturization of electromagnetic clutches, and the amount of magnetic powder used has also decreased. Therefore, magnetic powder with a higher saturation magnetic flux density, that is, higher torque when the same current is applied, is obtained. There is a demand for magnetic powders that can be used.
また、電磁クラッチの小型化に伴なって使用条件もより
厳しくなる傾向にあり、特に温度に関しては従来考えら
れなかった500℃付近まで磁性粉体の温度が上昇する条
件での使用が検討されている。In addition, with the downsizing of electromagnetic clutches, the operating conditions tend to become more severe, and in particular, the use under conditions where the temperature of the magnetic powder rises to around 500 ° C, which was previously unthinkable with regard to temperature, has been studied. There is.
従来より電磁クラッチ用としてFe−Al−Cr系合金（特公
昭38−23558）あるいはFe−Cr系ステンレススティール
等の粉体が主として用いられてきた。Conventionally, powders such as Fe-Al-Cr alloys (Japanese Patent Publication No. 38-23558) or Fe-Cr stainless steels have been mainly used for electromagnetic clutches.
［発明が解決しようとする問題点］ しかし、従来のこれらの粉体は一般に200℃程度までの
使用を前提に粉体の組成が考えられており、500℃近い
高温での使用では酸化が著しく進み、大量の微粉が発生
し、使用に耐え得ないことが多い。[Problems to be Solved by the Invention] However, these conventional powders are generally considered to have a composition of powder on the assumption that the powder is used up to about 200 ° C, and oxidation at a high temperature near 500 ° C causes remarkable oxidation. It often progresses and produces a large amount of fine powder, which often cannot be used.
［問題点を解決するための手段］ かかる目的を達成するため、本発明者は数々の検討の結
果、Fe−Al−Si−Cr−Co系合金粉体を使用することによ
り高温での耐酸化性の著しい改善と、充分な飽和磁束密
度の確保を両立させることが可能なことを見い出した。[Means for Solving the Problems] In order to achieve such an object, the present inventor has conducted various studies and found that the use of Fe—Al—Si—Cr—Co based alloy powder results in oxidation resistance at high temperatures. It has been found that it is possible to achieve both a marked improvement in the magnetic properties and a sufficient saturation magnetic flux density.
すなわち本出願に係る第１発明は、Al:0.5〜６重量％、
Si:0.5〜６重量％、Cr:8〜20重量％、Co:5〜35重量％、
残部Fe及び不可避的不純物からなる電磁クラッチ用磁性
粉体である。That is, the first invention according to the present application is Al: 0.5 to 6% by weight,
Si: 0.5-6 wt%, Cr: 8-20 wt%, Co: 5-35 wt%,
A magnetic powder for an electromagnetic clutch, which comprises the balance Fe and unavoidable impurities.
本出願に係る第２発明は、Al:0.5〜６重量％、Si:0.5〜
６重量％、Cr:8〜20重量％、Co:5〜35重量％、更にはRE
M（希土類金属）0.1〜1.5重量％、Ti:0.5〜2.0重量％、
Zr:0.1〜1.5重量％及びRu:0.1〜2.0重量％からなる群か
ら選択される少なくとも１種を含み、残部Fe及び不可避
的不純物からなる電磁クラッチ用磁性粉体である。The second invention according to the present application is: Al: 0.5 to 6% by weight, Si: 0.5 to
6% by weight, Cr: 8-20% by weight, Co: 5-35% by weight, and further RE
M (rare earth metal) 0.1 to 1.5% by weight, Ti: 0.5 to 2.0% by weight,
A magnetic powder for an electromagnetic clutch, comprising at least one selected from the group consisting of Zr: 0.1 to 1.5% by weight and Ru: 0.1 to 2.0% by weight, with the balance Fe and unavoidable impurities.
（成分限定理由） Al:0.5〜６重量％ Alは硬度の増大に寄与するとともに、Crとともに耐酸化
性を上昇させる重要な元素である。Al:0.5重量％の添加
で硬度及び耐酸化性は大きく改善されるが、６重量％を
超えて添加しても効果が飽和してしまうとともに、粉体
が脆くなり割れの発生が認められる。(Reason for Component Limitation) Al: 0.5-6 wt% Al is an important element that contributes to the increase in hardness and increases the oxidation resistance together with Cr. Hardness and oxidation resistance are greatly improved by adding Al: 0.5% by weight, but the effect is saturated even if added by more than 6% by weight, and the powder becomes brittle and cracking is observed.
Si:0.5〜６重量％ Siは、Alと同様に硬度を増大させ、耐摩耗性の向上に著
しい効果がある。Siは0.5重量％の添加で粉体の硬度は
大きく上昇する。添加量を増していくと硬度は徐々に上
昇するが、６重量％を超えた添加では粉体が脆くなり使
用中に粉体の割れが認められるようになり好ましくな
い。Si: 0.5 to 6 wt% Si increases hardness similarly to Al and has a remarkable effect in improving wear resistance. Addition of 0.5 wt% of Si greatly increases the hardness of the powder. The hardness gradually increases as the amount of addition increases, but if the amount of addition exceeds 6% by weight, the powder becomes brittle and cracks of the powder are observed during use, which is not preferable.
Cr:8〜20重量％ Crは高温耐酸化性の改善に最も効果の大き元素である。
ただし、８重量％未満の添加では効果が不足する。ま
た、20重量％を超えて添加すると飽和磁束密度が低下
し、トルク特性に悪影響を及ぼすようになり好ましくな
い。Cr: 8 to 20 wt% Cr is the most effective element for improving the high temperature oxidation resistance.
However, if the addition amount is less than 8% by weight, the effect is insufficient. Further, if it is added in an amount of more than 20% by weight, the saturation magnetic flux density is lowered and the torque characteristics are adversely affected, which is not preferable.
Co:5〜35重量％ Coは飽和磁束密度の改善に最も効果の大きい元素であ
り、Fe−Co純系ではCoが約30アトミック重量％にて金属
材料中最高の飽和磁束密度を達成することが一般に知ら
れている。本発明のFe−Al−Si−Cr−Co系合金の場合で
もFe−Co合金と同様の効果が求められる。Co:5重量％以
下では飽和磁束密度の向上は認められず、また、35重量
％を超えた添加ではかえって飽和磁束密度が低下する傾
向が認められる。Co: 5 to 35 wt% Co is the most effective element for improving the saturation magnetic flux density, and in a pure Fe-Co system, Co can achieve the highest saturation magnetic flux density in metallic materials at about 30 atomic weight%. Is generally known. Even in the case of the Fe-Al-Si-Cr-Co alloy of the present invention, the same effect as that of the Fe-Co alloy is required. When Co: 5% by weight or less, the saturation magnetic flux density is not improved, and when it exceeds 35% by weight, the saturation magnetic flux density tends to decrease.
なお、Al:1〜３重量％、Si:1〜３重量％、Cr:8〜15重量
％、Co:15〜35重量％の範囲がトルク特性と耐酸化性の
バランスが良好となり特に好ましい。The range of Al: 1 to 3% by weight, Si: 1 to 3% by weight, Cr: 8 to 15% by weight, Co: 15 to 35% by weight is particularly preferable because the balance between torque characteristics and oxidation resistance is good.
第２発明においては、第１発明の成分の他にREM（希土
類金属）0.1〜1.5重量％、Ti:0.5〜2.0重量％、Zr:0.1
〜1.5重量％及びRu:0.1〜2.0重量％からなる群から選択
される少なくとも１種を含む。In the second invention, in addition to the components of the first invention, REM (rare earth metal) 0.1 to 1.5 wt%, Ti: 0.5 to 2.0 wt%, Zr: 0.1
.About.1.5% by weight and Ru: 0.1 to 2.0% by weight, at least one selected from the group consisting of.
かかる元素を添加する第２発明においては、高温におけ
る耐酸化性を著しく向上させることができる。In the second invention in which such an element is added, the oxidation resistance at high temperature can be remarkably improved.
REM（希土類金属）としては、たとえば、ミッシュメタ
ル、Ｙ、Ce等を用いればよい。REMは微量の添加によっ
て耐酸化性を著しく改善させる有用な元素である。この
効果はCrを多量に含む場合に特に大きく、本組成の場
合、0.1重量％以上の添加で耐酸化性の大幅な向上が認
められる。また、2.0重量％を超えて添加しても効果が
飽和してしまい経済上無駄となる。As REM (rare earth metal), for example, misch metal, Y, Ce or the like may be used. REM is a useful element that significantly improves the oxidation resistance when added in a trace amount. This effect is particularly large when a large amount of Cr is contained, and in the case of this composition, a significant improvement in the oxidation resistance is recognized by adding 0.1% by weight or more. Further, even if added in an amount of more than 2.0% by weight, the effect is saturated and it is economically useless.
また、Tiの場合は、0.5重量％以上、Zrの場合は0.1重量
％以上、Ruの場合は0.1重量％以上の添加により高温に
おける耐酸化性が著しく向上する。しかし、Tiの場合
は、2.0重量％を超えて、Zrの場合は1.5重量％を超え
て、Ruの場合は2.0重量％を超えて添加しても効果が飽
和する。Further, addition of 0.5 wt% or more in the case of Ti, 0.1 wt% or more in the case of Zr, and 0.1 wt% or more in the case of Ru significantly improves the oxidation resistance at high temperature. However, if Ti is added in an amount of more than 2.0% by weight, Zr is added in an amount of more than 1.5% by weight, and Ru is added in an amount of more than 2.0% by weight, the effect is saturated.
［発明の実施例］ Al,Si,Cr,Coはいずれも耐酸化性を向上させる効果があ
る。また、粉体の磁気特性はAl,Si,Cr,Coの組み合わせ
により複雑に変化する。そこで、表１に示す各種成分の
アトマイズ粉末を作成し、実際に電磁クラッチに組み込
んでトルク特性を測定すると共に、ボールミルを用い、
500℃にて長時間加熱を行ない、耐酸化性試験を実施し
た。[Examples of the Invention] Al, Si, Cr, and Co all have the effect of improving the oxidation resistance. Moreover, the magnetic properties of the powder change intricately depending on the combination of Al, Si, Cr, and Co. Therefore, atomized powders of various components shown in Table 1 were prepared, actually incorporated into an electromagnetic clutch to measure torque characteristics, and a ball mill was used.
An oxidation resistance test was performed by heating at 500 ° C for a long time.
製作した粉体の特性値及び試験結果を表１に合せて示
す。The characteristic values of the manufactured powder and the test results are also shown in Table 1.
耐酸化性の評価はＸ線回折により行ない、酸化物のＸ線
回折ピークの強度とマトリックスである鉄のＸ線回折ピ
ークの強度の比を測定した。この値が小さいほど酸化の
程度は低い。The oxidation resistance was evaluated by X-ray diffraction, and the ratio between the intensity of the X-ray diffraction peak of the oxide and the intensity of the X-ray diffraction peak of the iron matrix was measured. The smaller this value, the lower the degree of oxidation.
また、耐摩耗性に大きな影響を及ぼす硬度の測定を行な
い。総合的に電磁クラッチ用磁性粉体としての適否を検
討した。Also, the hardness, which has a great influence on the wear resistance, is measured. The suitability as a magnetic powder for an electromagnetic clutch was comprehensively examined.
トルク測定に関しては、一定量の磁性粉体を組み込んだ
状態で定格電流を流し、定格トルク以上のトルクが得ら
れることが要求される。この値が大きいほどトルク効率
は高く、より少ない量の磁性粉体で、あるいはより少な
い電流にて一定量のトルクを伝達することが可能であ
る。Regarding the torque measurement, it is required that a rated current or more be applied with a certain amount of magnetic powder incorporated to obtain a torque equal to or higher than the rated torque. The larger this value, the higher the torque efficiency, and it is possible to transmit a certain amount of torque with a smaller amount of magnetic powder or with a smaller current.
硬度に関しては耐摩耗性の見地から、その値が高いほど
好ましい。最低でもHv180程度以上が要求される。From the viewpoint of wear resistance, the higher the hardness, the more preferable. At least Hv180 or higher is required.
表１中、NoA1〜A7は第１発明の実施例である、NoB1〜B
4、NoC1〜C4、NoD1〜D6は第２発明の実施例である。NoE
1,E2は従来例である。E1はFe−Al−Cr系合金、E2は12Cr
系ステンレススティルである。In Table 1, NoA1 to A7 are NoB1 to B, which are examples of the first invention.
4, NoC1 to C4 and NoD1 to D6 are examples of the second invention. NoE
1 and E2 are conventional examples. E1 is Fe-Al-Cr alloy, E2 is 12Cr
System stainless steel.
表１中、A2,A7,B4,C4,D1,D2,D6の成分系の合金からガス
アトマイズ法により球状の磁性粉体を得た。A3の磁性粉
体の使用前の粒子構造を第１図に示す。In Table 1, spherical magnetic powders were obtained by the gas atomizing method from the alloys of the component systems of A2, A7, B4, C4, D1, D2 and D6. The particle structure of the A3 magnetic powder before use is shown in FIG.
ガスアトマイズ法による球状粉には、第１図にも見られ
るごとく、いくつかの球状粉同志が冷却過程で凝着し
た。すなわち、球状粉同志がくっついた一種の不定形粉
の存在が避けられない。しかしながら、これらの不定形
粉の存在は、電磁クラッチの特性をなんら損なうことは
なく、実用上全く問題とはならない。As shown in Fig. 1, some spherical powders adhered to each other during the cooling process in the spherical powders obtained by the gas atomization method. That is, the existence of a kind of irregularly shaped powder in which spherical powders are stuck together is inevitable. However, the presence of these irregularly shaped powders does not impair the characteristics of the electromagnetic clutch at all and poses no practical problem at all.
また、ガスアトマイズ法による球状粉の場合、流動性及
び占積率に優れるため、電磁クラッチの応答性及びトル
クの安定性が向上すると共に、粉体間の接点が多く伝達
トルクが適宜分散され過大な摩擦力の発生を回避するた
め、粉体自身の耐酸化性、耐摩耗性と相まって良好な耐
久性を示す。Further, in the case of the spherical powder produced by the gas atomizing method, the fluidity and the space factor are excellent, so that the response of the electromagnetic clutch and the stability of the torque are improved, and there are many contact points between the powders and the transmission torque is appropriately dispersed and excessive. In order to avoid the generation of frictional force, it exhibits good durability in combination with the oxidation resistance and wear resistance of the powder itself.
A2,A7,B4,C4,D1,D2,D6のいずれも磁性粉体も電磁クラッ
チに使用した場合、磁気特性に優れているためトルク特
性が良好である。B4.C4の粉体につき電流−トルク特性
を測定した結果を第２図及び第３図のそれぞれに示す。
第２図及び第３図中には比較のため従来より使用されて
いるE1の結果も合せて示す。この試験を行なった電磁ク
ラッチは、定格電流1.5Aにて定格トルク10kg・ｍのもの
であり、E1粉体は定格電流にて10.3kg・ｍのトルクを示
す。これに対し、B4及びC4粉体は定格電流にて16.3kg・
ｍのトルクを示すほか、全電流範囲にわたってE1粉体に
比較して高いトルクを示す。When magnetic powders of A2, A7, B4, C4, D1, D2, D6 are also used for the electromagnetic clutch, the magnetic characteristics are excellent and the torque characteristics are good. The results of measuring the current-torque characteristics of the B4.C4 powder are shown in FIGS. 2 and 3, respectively.
The results of E1 which has been conventionally used are also shown in FIGS. 2 and 3 for comparison. The electromagnetic clutch subjected to this test has a rated torque of 10 kg · m at a rated current of 1.5 A, and the E1 powder shows a torque of 10.3 kg · m at a rated current. In contrast, B4 and C4 powders have a rated current of 16.3 kg
In addition to showing a torque of m, it shows a higher torque than the E1 powder over the entire current range.
A2,A7,B4,C4,D1,D2,D6いずれの磁性粉体も高温での耐酸
化性に優れ、磁性粉体が500℃近い高温になる条件下に
おいても長期にわたり安定したトルクを示す。1000時間
高温耐久試験後のトルクの低下率を表２に示す。表２に
はE1,E2の1000時間高温耐久試験の結果も合せて示す。E
1,E2は高温下ではほとんど使いものにならないほどトル
クの低下が著しいが、A2,A7,B4,C4,D1,D2,D6はともにト
ルクの低下率が低く、充分使用に耐え得る。All of the magnetic powders of A2, A7, B4, C4, D1, D2, D6 have excellent oxidation resistance at high temperature, and show stable torque for a long time even under the condition that the magnetic powder has a high temperature of about 500 ° C. Table 2 shows the reduction rate of the torque after the 1000-hour high temperature durability test. Table 2 also shows the results of the 1000-hour high temperature durability test of E1 and E2. E
Although the torque of 1 and E2 is so remarkable that it becomes almost unusable at high temperature, the torque reduction rate of A2, A7, B4, C4, D1, D2 and D6 is low and can be used sufficiently.
［発明の効果］ 本出願に係る第１発明によれば、小型で、かつ、高温に
て使用される電磁クラッチに用いることの可能な磁性粉
体を提供することができる。[Effects of the Invention] According to the first invention of the present application, it is possible to provide a magnetic powder that is small in size and can be used in an electromagnetic clutch used at high temperatures.
第２発明によれば、上記第１発明の効果に加え、耐酸化
性がより優れた磁性粉体を提供することができる。According to the second invention, in addition to the effect of the first invention, it is possible to provide a magnetic powder having more excellent oxidation resistance.
第１図は、ガスアトマイズ法による球状粉の粒子構造を
示す顕微鏡写真である。第２及び第３図は電流トルク特
性の関係を示すグラフである。FIG. 1 is a micrograph showing the particle structure of spherical powder obtained by the gas atomizing method. 2 and 3 are graphs showing the relationship between the current torque characteristics.
Claims (6)
r:8〜20重量％、Co:5〜35重量％、残部Fe及び不可避的
不純物からなる電磁クラッチ用磁性粉体。1. Al: 0.5 to 6% by weight, Si: 0.5 to 6% by weight, C
A magnetic powder for an electromagnetic clutch, which contains r: 8 to 20% by weight, Co: 5 to 35% by weight, the balance Fe and unavoidable impurities.
量％、Cr:8〜20重量％、Co:5〜35重量％、更にはREM
（希土類金属）0.1〜1.5重量％、Ti:0.5〜2.0重量％、Z
r:0.1〜1.5重量％及びRu:0.1〜2.0重量％からなる群か
ら選択される少なくとも１種を含み、残部Fe及び不可避
的不純物からなる電磁クラッチ用磁性粉体。2. A weight ratio of Al: 0.5 to 6% by weight, Si: 0.5 to 6% by weight, Cr: 8 to 20% by weight, Co: 5 to 35% by weight, and further REM.
(Rare earth metal) 0.1-1.5% by weight, Ti: 0.5-2.0% by weight, Z
A magnetic powder for an electromagnetic clutch, which contains at least one selected from the group consisting of r: 0.1 to 1.5% by weight and Ru: 0.1 to 2.0% by weight, and the balance Fe and unavoidable impurities.
載の電磁クラッチ用磁性粉体。3. The magnetic powder for an electromagnetic clutch according to claim 1, wherein the powder is spherical.
載の電磁クラッチ用磁性粉体。4. The magnetic powder for an electromagnetic clutch according to claim 2, wherein the powder is spherical.
体である特許請求の範囲第１項又は第３項記載の電磁ク
ラッチ用磁性粉体。5. The magnetic powder for an electromagnetic clutch according to claim 1 or 3, wherein the powder is a powder obtained by a gas atomizing method.
体である特許請求の範囲第２項又は第４項記載の電磁ク
ラッチ用磁性粉体。6. The magnetic powder for an electromagnetic clutch according to claim 2 or 4, wherein the powder is a powder obtained by a gas atomizing method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61102394A JPH0689366B2 (en) | 1986-05-01 | 1986-05-01 | Magnetic powder for electromagnetic clutch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61102394A JPH0689366B2 (en) | 1986-05-01 | 1986-05-01 | Magnetic powder for electromagnetic clutch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62260001A JPS62260001A (en) | 1987-11-12 |
| JPH0689366B2 true JPH0689366B2 (en) | 1994-11-09 |
Family
ID=14326230
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61102394A Expired - Fee Related JPH0689366B2 (en) | 1986-05-01 | 1986-05-01 | Magnetic powder for electromagnetic clutch |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0689366B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63233507A (en) * | 1987-03-20 | 1988-09-29 | Kobe Steel Ltd | Magnetic powder for electromagnetic clutch |
| JPH0711001B2 (en) * | 1989-07-07 | 1995-02-08 | 三菱電機株式会社 | Method of manufacturing magnetic particles for magnetic particle type electromagnetic coupling device |
| FR2743572B1 (en) * | 1996-01-11 | 1998-02-13 | Imphy Sa | IRON-COBALT ALLOY, METHOD FOR MANUFACTURING A STRIP OF IRON-COBALT ALLOY AND STRIP OBTAINED |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5823460A (en) * | 1981-08-05 | 1983-02-12 | Toshiba Corp | Handler for flat package |
-
1986
- 1986-05-01 JP JP61102394A patent/JPH0689366B2/en not_active Expired - Fee Related
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5823460A (en) * | 1981-08-05 | 1983-02-12 | Toshiba Corp | Handler for flat package |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62260001A (en) | 1987-11-12 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |