JPH04152611A - Aging treatment method for rare-earth magnet - Google Patents
Aging treatment method for rare-earth magnetInfo
- Publication number
- JPH04152611A JPH04152611A JP2277964A JP27796490A JPH04152611A JP H04152611 A JPH04152611 A JP H04152611A JP 2277964 A JP2277964 A JP 2277964A JP 27796490 A JP27796490 A JP 27796490A JP H04152611 A JPH04152611 A JP H04152611A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- rare earth
- pressure
- raising
- earth magnet
- 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.)
- Pending
Links
- 229910052761 rare earth metal Inorganic materials 0.000 title claims abstract description 42
- 150000002910 rare earth metals Chemical class 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000032683 aging Effects 0.000 title claims abstract description 28
- 239000011261 inert gas Substances 0.000 claims abstract description 17
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 238000001816 cooling Methods 0.000 claims description 21
- 230000002431 foraging effect Effects 0.000 claims description 4
- 239000007789 gas Substances 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 3
- 230000001419 dependent effect Effects 0.000 abstract 1
- 239000000203 mixture Substances 0.000 description 6
- 239000000956 alloy Substances 0.000 description 3
- 229910045601 alloy Inorganic materials 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 239000000843 powder Substances 0.000 description 2
- 229910052692 Dysprosium Inorganic materials 0.000 description 1
- 229910052691 Erbium Inorganic materials 0.000 description 1
- 229910052693 Europium Inorganic materials 0.000 description 1
- 229910052688 Gadolinium Inorganic materials 0.000 description 1
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 229910052771 Terbium Inorganic materials 0.000 description 1
- 229910052775 Thulium Inorganic materials 0.000 description 1
- 229910052769 Ytterbium Inorganic materials 0.000 description 1
- 229910052768 actinide Inorganic materials 0.000 description 1
- 150000001255 actinides Chemical class 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 229910052747 lanthanoid Inorganic materials 0.000 description 1
- 150000002602 lanthanoids Chemical class 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は、Ｒ（Ｒは、Ｙを含む希土類金属元素の１種以
上である）−Ｆｅ−Ｂ系やＳｍ−Ｃ○系等の希土類磁石
を時効処理する方法に関する。[Detailed Description of the Invention] <Industrial Application Field> The present invention is directed to rare earth metal elements such as R (R is one or more rare earth metal elements including Y)-Fe-B system and Sm-C○ system. This invention relates to a method of aging a magnet.
〈従来の技術〉
高性能を有する希土類磁石としては、Ｓｍ−Ｃｏ系磁石
や、低コストでＳｍ−Ｃｏ系以上の磁気特性が得られる
Ｎｄ−Ｆｅ−Ｂ等のＲ−Ｆｅ−Ｂ系磁石が知られている
。<Prior art> Rare earth magnets with high performance include Sm-Co magnets and R-Fe-B magnets such as Nd-Fe-B, which can provide magnetic properties superior to Sm-Co magnets at low cost. Are known.
これらの希土類磁石には、場合によっては磁気特性改善
のために時効処理が施される。 従来、時効処理は、処
理室内に複数の希土類磁石を入れ、１気圧程度以上の不
活性ガス雰囲気か、１００ Ｔｏｒｒ以下程度まで減圧
した不活性ガス雰囲気下で熱処理することにより行なわ
れている。These rare earth magnets are sometimes subjected to aging treatment to improve their magnetic properties. Conventionally, aging treatment has been carried out by placing a plurality of rare earth magnets in a processing chamber and heat-treating them in an inert gas atmosphere of about 1 atmosphere or more or an inert gas atmosphere reduced to about 100 Torr or less.
〈発明が解決しようとする課題〉
しかし、時効処理を減圧雰囲気下で行なうと、磁石の昇
温か主として輻射により行なわれることになるため、昇
温時間が長くなるとし）う問題がある。<Problems to be Solved by the Invention> However, if the aging treatment is performed in a reduced pressure atmosphere, the heating of the magnet is mainly done by radiation, so there is a problem that the heating time becomes long.
一方、時効処理を１気圧以上の雰囲気下で行なうと、処
理室内でガスの対流が生じるため昇温は速（なる。 し
かし、昇温後、磁石の温度を保持して時効を行なう際に
は、ガスの対流の影響で処理室内に温度分布が生じるた
め、複数の磁石を均等に熱処理することが困難となる。On the other hand, if the aging treatment is performed in an atmosphere of 1 atm or higher, the temperature rises quickly due to gas convection within the treatment chamber. Since temperature distribution occurs within the processing chamber due to the influence of gas convection, it becomes difficult to uniformly heat treat a plurality of magnets.
本発明はこのような事情からなされたものであり、時効
処理時の処理室内での位置に依存する特性のばらつきを
なくし、しかも迅速な処理が可能な希土類磁石の時効処
理方法を提供することを目的とする。The present invention has been made under these circumstances, and it is an object of the present invention to provide a method for aging rare earth magnets that eliminates variations in characteristics depending on the position in a processing chamber during aging treatment and that allows rapid processing. purpose.
〈課題を解決するための手段〉
このような目的は、下記（１）〜（３）の本発明によっ
て達成される。<Means for Solving the Problems> Such objects are achieved by the following inventions (1) to (3).
（１）希土類磁石に時効処理を施す方法であって、
希土類磁石を昇温する昇温工程、昇温された前記希土類
磁石の温度をほぼ一定に保持する温度保持工程および前
記希土類磁石を常温まで降温する降温工程をこの順で有
し、
前記昇温工程、前記温度保持工程および前記降温工程が
不活性ガス雰囲気または真空中で行なわれ、
前記昇温工程において、前記温度保持工程における保持
温度の少なくとも５０％まで昇温するときの雰囲気の圧
力が、前記温度保持工程における雰囲気の圧力よりも高
いことを特徴とする希土類磁石の時効処理方法。(1) A method of aging a rare earth magnet, which includes a temperature raising step of raising the temperature of the rare earth magnet, a temperature holding step of keeping the temperature of the raised rare earth magnet almost constant, and a temperature raising step of raising the temperature of the rare earth magnet to room temperature. It has a temperature lowering step in which the temperature is lowered in this order, the temperature raising step, the temperature holding step and the temperature lowering step are performed in an inert gas atmosphere or a vacuum, and in the temperature raising step, the temperature at which the temperature is lowered in the temperature holding step is lowered. A method for aging a rare earth magnet, characterized in that the pressure of the atmosphere when raising the temperature to at least 50% is higher than the pressure of the atmosphere in the temperature holding step.
（２）前記昇温工程が５００ Ｔｏｒｒ以上の不活性ガ
ス雰囲気中で行なわれ、前記温度保持工程が４００７ｏ
ｒ、ｒ以下の不活性ガス雰囲気または真空中で行なわれ
る上記（１）に記載の希土類磁石の時効処理方法。(2) The temperature raising step is carried out in an inert gas atmosphere of 500 Torr or more, and the temperature holding step is carried out at 4007 Torr or more.
The aging treatment method for rare earth magnets according to (1) above, which is carried out in an inert gas atmosphere of r, r or less or in vacuum.
（３）処理室と、この処理室に隣接する降温室とを有す
るバッチ連続炉を用い、
前記昇温工程および前言己温度保持工程を前記処理室内
で行ない、前記処理室内の圧力と前記降温室内の圧力と
をほぼ同等とした後、前記処理室内から前記降温室内に
希土類磁石を移送し、前記降温室内において前記希土類
磁石の降温を行ないながら、前記処理室内に他の希土類
磁石を搬入して前記昇温工程および前記温度保持工程を
行なう上記（１）または（２）に記載の希土類磁石の時
効処理方法。(3) Using a batch continuous furnace having a processing chamber and a cooling chamber adjacent to the processing chamber, the temperature raising step and the self-temperature holding step are performed within the processing chamber, and the pressure within the processing chamber and the cooling chamber are adjusted. After making the pressure almost equal to the pressure of The aging treatment method for rare earth magnets according to (1) or (2) above, wherein the temperature raising step and the temperature holding step are performed.
〈作用〉
本発明では、希土類磁石に時効処理を施すに際し、昇温
工程の少なくとも前半部分における雰囲気圧力を温度保
持工程における雰囲気圧力よりも高く設定する。<Function> In the present invention, when subjecting a rare earth magnet to aging treatment, the atmospheric pressure in at least the first half of the temperature raising process is set higher than the atmospheric pressure in the temperature holding process.
昇温工程における雰囲気圧力を高（設定することにより
、希土類磁石の昇温にガスの対流が寄与するようになる
ため、迅速な昇温か可能となる。 また、温度保持工程
では、雰囲気圧力が低いためガスの対流の影響が少なく
、処理室内の複数の希土類磁石を均等に時効処理するこ
とができ、特性のばらつきの少ない希土類磁石が得られ
る。By setting the atmospheric pressure high in the temperature raising process, gas convection will contribute to raising the temperature of the rare earth magnet, making it possible to raise the temperature quickly. Also, in the temperature holding process, the atmospheric pressure is low. Therefore, the influence of gas convection is small, and a plurality of rare earth magnets in the processing chamber can be aged evenly, resulting in rare earth magnets with less variation in characteristics.
く具体的構成〉 以下、本発明の具体的構成について詳細に説明する。Specific composition> Hereinafter, a specific configuration of the present invention will be explained in detail.
本発明の時効処理方法は、希土類磁石を昇温する昇温工
程、昇温された前記希土類磁石の温度をほぼ一定に保持
する温度保持工程および前記希土類磁石を常温まで降温
する降温工程をこの順で有する。 これらの工程は、不
活性ガス雰囲気または真空中で行なわれる。The aging treatment method of the present invention includes a temperature raising step of raising the temperature of a rare earth magnet, a temperature holding step of keeping the temperature of the raised rare earth magnet almost constant, and a temperature lowering step of cooling the rare earth magnet to room temperature in this order. It has. These steps are performed in an inert gas atmosphere or vacuum.
そして、前記昇温工程の少なくとも前半における雰囲気
の圧力を、前記温度保持工程における雰囲気の圧力より
も高く設定する。 なお、本明細書において昇温工程の
前半とは、温度保持工程における保持温度の５０％まで
昇温させる部分を意味する。The pressure of the atmosphere during at least the first half of the temperature raising step is set higher than the pressure of the atmosphere during the temperature holding step. Note that in this specification, the first half of the temperature raising step refers to the portion where the temperature is raised to 50% of the holding temperature in the temperature holding step.
より詳細には、昇温工程の少なくとも前半は、５００
Ｔｏｒｒ以上、特に７６０ Ｔｏｒｒ以上の不活性ガス
雰囲気中で行なうことが好ましい。More specifically, at least the first half of the temperature raising step is 500
It is preferable to carry out the process in an inert gas atmosphere of at least 760 Torr, especially at least 760 Torr.
昇温工程の少なくとも前半の圧力が前記範囲未満である
と、迅速な昇温か困難となる。If the pressure in at least the first half of the temperature raising step is less than the above range, it becomes difficult to raise the temperature rapidly.
なお、昇温の全工程において温度保持工程よりも雰囲気
圧力を高（すれば、さらに迅速な昇温を行なうことがで
きる。Note that if the atmospheric pressure is set higher in all the temperature raising steps than in the temperature holding step, the temperature can be raised more quickly.
昇温工程前半における雰囲気圧力の上限は特にないが、
通常、７６００ Ｔｏｒｒ以下とする。There is no particular upper limit for the atmospheric pressure in the first half of the temperature raising process, but
Usually, it is 7600 Torr or less.
なお、用いる不活性ガスに特に制限はないが、通常、Ａ
ｒを用いる。There is no particular restriction on the inert gas used, but usually A
Use r.
昇温工程により昇温された希土類磁石は、続く温度保持
工程においてほぼ一定の温度、例えば±３０℃程度の範
囲に保持されて熱処理される。The rare earth magnet whose temperature has been raised in the temperature raising step is heat-treated by being held at a substantially constant temperature, for example, within a range of about ±30° C., in the subsequent temperature holding step.
温度保持工程は、４００ Ｔｏｒｒ以下、特に１００
Ｔｏｒｒ以下の不活性ガス雰囲気中か、または真空中で
行なうことが好ましい。 不活性ガスとしては、前述し
た昇温工程と同様なものを用いればよい。The temperature holding step is performed at a temperature of 400 Torr or less, especially 100 Torr or less.
It is preferable to carry out in an inert gas atmosphere of Torr or less or in vacuum. As the inert gas, the same one as in the temperature raising step described above may be used.
温度保持工程での保持温度および温度保持時間は、磁石
組成等の各種条件を考慮して適宜設定すればよい。The holding temperature and temperature holding time in the temperature holding step may be appropriately set in consideration of various conditions such as magnet composition.
温度保持工程を経た希土類磁石は、降温工程において室
温まで降温される。 降温工程における雰囲気圧力に特
に制限はないが、前述した昇温工程における雰囲気圧力
程度以上にまで昇圧してから降温することが好ましい。The rare earth magnet that has undergone the temperature holding step is cooled down to room temperature in the cooling step. Although there is no particular restriction on the atmospheric pressure in the temperature-lowering step, it is preferable to raise the pressure to a level equal to or higher than the atmospheric pressure in the temperature-raising step described above and then lower the temperature.
降温工程における雰囲気は、不活性ガス雰囲気とするこ
とが好ましく、真空中において降温してもよい。The atmosphere in the temperature lowering step is preferably an inert gas atmosphere, and the temperature may be lowered in vacuum.
上記した昇温工程、温度保持工程および降温工程は、い
わゆるバッチ連続炉内において連続して行なわれること
が好ましい。 バッチ連続炉を用いることにより、時効
処理をさらに迅速に行なうことが可能となる。The temperature raising step, temperature holding step and temperature lowering step described above are preferably performed continuously in a so-called continuous batch furnace. By using a batch continuous furnace, it becomes possible to carry out the aging treatment even more quickly.
バッチ連続炉とは、昇温工程および温度保持工程が行な
われる処理室と、この処理室に隣接する降温室とを有す
る熱処理用の炉である。A batch continuous furnace is a heat treatment furnace that has a processing chamber in which a temperature raising step and a temperature holding step are performed, and a cooling chamber adjacent to this processing chamber.
処理室と降温室との間にはシャッタ等が設けられ、両室
の雰囲気を遮断している。A shutter or the like is provided between the processing chamber and the cooling chamber to shut off the atmosphere between the two chambers.
このようなバッチ連続炉では、処理室内を前記した圧力
の不活性ガス雰囲気として希土類磁石の昇温を行ない、
次いで処理室内を前記した圧力範囲まで減圧して温度保
持工程を行なう。In such a batch continuous furnace, the temperature of the rare earth magnet is raised by creating an inert gas atmosphere at the above-mentioned pressure in the processing chamber.
Next, the pressure inside the processing chamber is reduced to the above-described pressure range, and a temperature holding step is performed.
温度保持工程締了後、処理室と降温室との間のシャッタ
を開いて希土類磁石を降温室に移送し、シャッタを閉じ
る。 シャッタを開ける際には、降温室内を処理室内と
同程度の圧力に保っておく。After the temperature holding step is completed, the shutter between the processing chamber and the cooling chamber is opened, the rare earth magnet is transferred to the cooling chamber, and the shutter is closed. When opening the shutter, keep the inside of the cooling chamber at the same pressure as the processing chamber.
降温工程はこの圧力のまま行なってもよく、昇圧してか
ら降温を行なってもよい。 また、処理室を昇圧してか
らシャッタを開き、同程度の圧力の降温室に磁石を移送
して、降温する構成としてもよい。The temperature lowering step may be performed at this pressure, or the temperature may be lowered after increasing the pressure. Alternatively, the temperature may be lowered by increasing the pressure in the processing chamber, opening the shutter, and transferring the magnet to a cooling chamber with a similar pressure.
降温室に磁石が移送されると、処理室内には次に時効処
理される希土類磁石が搬入され、」記のようにして昇温
工程および温度保持工程鴫経て、降温室に移送される。When the magnets are transferred to the cooling chamber, the rare earth magnets to be subjected to aging treatment are carried into the processing chamber, and are transferred to the cooling chamber through a temperature raising process and a temperature holding process as described in the above.
なお、処理室ｑ前段に雰囲気および圧力調整のための
予備室布設けてもよい。Note that a preliminary chamber cloth for adjusting the atmosphere and pressure may be provided upstream of the processing chamber q.
このような工程を繰り返すことにより、Ｓ−ｆ類磁石の
時効処理を連続的に行なうことができる。By repeating such steps, the aging treatment of the S-f class magnet can be performed continuously.
なお、処理室内の雰囲気および降温室内の雰囲気２は、
通常、全て不活性ガスか、これを減丹してほぼ真空とし
たものである。The atmosphere inside the processing chamber and the atmosphere 2 inside the cooling chamber are as follows:
Usually, it is all inert gas or reduced to almost a vacuum.
本発明は、昇温、温度保持および降温のサイクルを２回
以上繰り返す多段時効処理にも適用することができるが
、例えば２段時効処理を行なう場合、シャッタ等を介し
て降温室に隣接する第２の処理室を設け、さらにこの第
２の処理室に隣接して第２の降温室を設けたバッチ連続
炉を用いればよい。 ３段以上の時効処理を施す場合に
は、時効の回数分だけ処理室および降温室を直列に接続
したバッチ連続炉を用いればよい。The present invention can also be applied to multi-stage aging treatment in which the cycles of temperature increase, temperature maintenance, and temperature reduction are repeated two or more times. For example, when performing two-stage aging treatment, a A batch continuous furnace may be used, which is provided with two processing chambers and further provided with a second cooling chamber adjacent to the second processing chamber. When performing aging treatment in three or more stages, a continuous batch furnace may be used in which treatment chambers and cooling chambers are connected in series for the number of times of aging.
本発明が適用される希土類磁石の組成に特に制限はなく
、Ｒ（Ｒは、Ｙを含む希土類金属元素の１種以上である
）、Ｔ（Ｔは、Ｆｅ、またはＦｅおよびＣｏである）お
よびＢを含むＲ−Ｆｅ−Ｂ系の焼結永久磁石や、Ｓｍ−
Ｃｏ系の焼結永久磁石等のいずれに対しても適用可能で
ある。The composition of the rare earth magnet to which the present invention is applied is not particularly limited, and includes R (R is one or more rare earth metal elements including Y), T (T is Fe, or Fe and Co), and R-Fe-B sintered permanent magnet containing B, Sm-
It is applicable to any Co-based sintered permanent magnet.
Ｒ−Ｆｅ−Ｂ系磁石に適用する場合、良好な磁気特性を
得るためには下記組成とすることが好ましい。When applied to an R-Fe-B magnet, the following composition is preferred in order to obtain good magnetic properties.
Ｒ，ＢおよびＴの含有量は、 Ｒ：２７〜４０重量％ Ｂ：０．８〜１，５重量％および Ｔ：残部 であることが好ましい。The content of R, B and T is R: 27-40% by weight B: 0.8-1.5% by weight and T: remainder It is preferable that
本発明において希土類元素Ｒとは、Ｙ、ランタニドおよ
びアクチニドであり、Ｒとしては、Ｎｄ、Ｐｒ、Ｈｏ、
Ｔｂのうち少なくとも１種、あるいはさらに、Ｌａ、Ｓ
ｍ、Ｃｅ。In the present invention, rare earth elements R include Y, lanthanide, and actinide, and R includes Nd, Pr, Ho,
At least one of Tb, or in addition, La, S
m, Ce.
Ｇｄ、Ｅｒ、Ｅｕ、Ｐｍ、Ｔｍ、Ｙｂ、Ｙのうち１種以
上を含むものが好ましい。Those containing one or more of Gd, Er, Eu, Pm, Tm, Yb, and Y are preferable.
なお、Ｒとして２種以上の元素を用いる場合、原料とし
てミツシュメタル等の混合物を用いることもできる。In addition, when using two or more types of elements as R, a mixture such as mitshu metal can also be used as a raw material.
なお、Ｃｏを含有させることにより、磁気特性を損うこ
となく温度特性を改善することができる。 ただし、Ｃ
ｏがＴの５０％を超えると磁気特性が劣化するため、Ｃ
ｏはＴの５０％以下とすることが好ましい。Note that by including Co, the temperature characteristics can be improved without impairing the magnetic characteristics. However, C
If o exceeds 50% of T, the magnetic properties will deteriorate, so C
It is preferable that o is 50% or less of T.
〈実施例〉
以下、本発明の具体的実施例を示し、本発明をさらに詳
細に説明する。<Examples> Hereinafter, specific examples of the present invention will be shown and the present invention will be explained in further detail.
重量百分率で、（Ｎｄ３１．５％、Ｄｙ１．５％、Ｂ１
．１％、Ａｎｄ、３％、Ｆｅ残部）の組成を有する合金
インゴットをショークラッシャおよびブラウンミルによ
り−＃３２にまで粗粉砕し、次いで、ジェットミルによ
り微粉砕して平均粒径４μｍの合金粉末を得た。In weight percentage, (Nd 31.5%, Dy 1.5%, B1
．． An alloy ingot having a composition of 1%, And, 3%, Fe balance) was coarsely crushed to -#32 using a Shaw crusher and a Brown mill, and then finely crushed using a jet mill to obtain an alloy powder with an average particle size of 4 μm. Obtained.
次いで、合金粉末を１２ｋＯｅの磁場中にて１ 、 ５
ｔ／ｃｍ２の圧力で成形し、さらに真空中で１０９０
℃にて４時間焼結した後、急冷し、磁石を得た。Next, the alloy powder was heated at 1 and 5 in a magnetic field of 12 kOe.
It is molded at a pressure of t/cm2, and then molded at a pressure of 1090 t/cm2 in a vacuum.
After sintering at ℃ for 4 hours, it was rapidly cooled to obtain a magnet.
得られた磁石に時効処理を施した。The obtained magnet was subjected to aging treatment.
まず、前述したバッチ連続炉の処理室内にほぼ均等に散
らばるように３０個の磁石を搬入し、８００ Ｔｏｒｒ
のＡｒガス雰囲気とした。 次いで、処理室内のヒータ
により磁石を６５０”Ｃまで昇温した。 次に処理室内
を０．０５Ｔｏｒｒまで減圧し、磁石を前記温度に保持
したまま１時間熱処理を施した。 さらに、処理室内に
Ａｒガスを導入して室内の圧力を８００ Ｔｏｒｒとし
、処理室と降温室との間のシャッタを開いて、処理室と
同圧力に保たれた降温室内に磁石を移送し、降温した。First, 30 magnets were brought into the processing chamber of the batch continuous furnace described above so as to be almost evenly distributed, and the magnets were heated to 800 Torr.
The atmosphere was set to Ar gas atmosphere. Next, the temperature of the magnet was raised to 650"C using a heater in the processing chamber. Next, the pressure inside the processing chamber was reduced to 0.05 Torr, and heat treatment was performed for 1 hour while the magnet was maintained at the above temperature. Furthermore, Ar was placed in the processing chamber. Gas was introduced to bring the pressure inside the chamber to 800 Torr, a shutter between the processing chamber and the cooling chamber was opened, and the magnet was transferred into the cooling chamber maintained at the same pressure as the processing chamber, and the temperature was lowered.
時効処理後に、同時に処理を行なった磁石の磁気特性を
測定したところ、保磁力ｉＨｃのばらつきはσ＝０．２
５ｋＯｅであった。After the aging treatment, we measured the magnetic properties of the treated magnets and found that the variation in coercive force iHc was σ = 0.2
It was 5 kOe.
なお、比較のために、昇温工程と温度保持工程とを、い
ずれも８００ ＴｏｒｒのＡｒガス雰囲気で行なった磁
石は、 ｉＨｃのばらつきがσ＝０．８５ｋＯｅであっ
た。For comparison, a magnet whose temperature raising step and temperature holding step were both performed in an Ar gas atmosphere of 800 Torr had a variation in iHc of σ=0.85 kOe.
また、昇温工程を０．０５Ｔｏｒｒのほぼ真空中で行な
ったところ、６５０℃まで昇温するために要した時間は
、８００ Ｔｏｒｒの場合に比べ１５％増加した。Further, when the temperature raising step was performed in a vacuum of 0.05 Torr, the time required to raise the temperature to 650° C. was increased by 15% compared to the case of 800 Torr.
以上の実施例から、本発明の効果が明らかである。The effects of the present invention are clear from the above examples.
〈発明の効果〉
本発明によれば、時効処理時の処理室内の位置に依存す
る特性のばらつきをなくすことができ、しかも迅速な処
理が可能な希土類磁石の時効処理方法が実現する。<Effects of the Invention> According to the present invention, it is possible to realize a method for aging rare earth magnets that can eliminate variations in characteristics depending on the position in the processing chamber during aging treatment and can perform rapid processing.
Claims (3)
磁石の温度をほぼ一定に保持する温度保持工程および前
記希土類磁石を常温まで降温する降温工程をこの順で有
し、 前記昇温工程、前記温度保持工程および前記降温工程が
不活性ガス雰囲気または真空中で行なわれ、 前記昇温工程において、前記温度保持工程における保持
温度の少なくとも５０％まで昇温するときの雰囲気の圧
力が、前記温度保持工程における雰囲気の圧力よりも高
いことを特徴とする希土類磁石の時効処理方法。(1) A method of aging a rare earth magnet, which includes a temperature raising step of raising the temperature of the rare earth magnet, a temperature holding step of keeping the temperature of the raised rare earth magnet almost constant, and a temperature raising step of raising the temperature of the rare earth magnet to room temperature. It has a temperature lowering step in which the temperature is lowered in this order, the temperature raising step, the temperature holding step and the temperature lowering step are performed in an inert gas atmosphere or a vacuum, and in the temperature raising step, the temperature at which the temperature is lowered in the temperature holding step is lowered. A method for aging a rare earth magnet, characterized in that the pressure of the atmosphere when raising the temperature to at least 50% is higher than the pressure of the atmosphere in the temperature holding step.
雰囲気中で行なわれ、前記温度保持工程が４００Ｔｏｒ
ｒ以下の不活性ガス雰囲気または真空中で行なわれる請
求項１に記載の希土類磁石の時効処理方法。(2) The temperature raising step is carried out in an inert gas atmosphere of 500 Torr or more, and the temperature holding step is carried out at 400 Torr.
2. The aging treatment method for rare earth magnets according to claim 1, wherein the aging treatment method is carried out in an inert gas atmosphere of less than r or in vacuum.
るバッチ連続炉を用い、 前記昇温工程および前記温度保持工程を前記処理室内で
行ない、前記処理室内の圧力と前記降温室内の圧力とを
ほぼ同等とした後、前記処理室内から前記降温室内に希
土類磁石を移送し、前記降温室内において前記希土類磁
石の降温を行ないながら、前記処理室内に他の希土類磁
石を搬入して前記昇温工程および前記温度保持工程を行
なう請求項１または２に記載の希土類磁石の時効処理方
法。(3) Using a batch continuous furnace having a processing chamber and a cooling chamber adjacent to the processing chamber, the temperature raising step and the temperature holding step are performed in the processing chamber, and the pressure in the processing chamber and the temperature in the cooling chamber are After making the pressure almost the same, the rare earth magnet is transferred from the processing chamber to the cooling chamber, and while the temperature of the rare earth magnet is lowered in the cooling chamber, another rare earth magnet is brought into the processing chamber and the temperature rises. The aging treatment method for rare earth magnets according to claim 1 or 2, wherein the heating step and the temperature holding step are performed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2277964A JPH04152611A (en) | 1990-10-17 | 1990-10-17 | Aging treatment method for rare-earth magnet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2277964A JPH04152611A (en) | 1990-10-17 | 1990-10-17 | Aging treatment method for rare-earth magnet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04152611A true JPH04152611A (en) | 1992-05-26 |
Family
ID=17590730
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2277964A Pending JPH04152611A (en) | 1990-10-17 | 1990-10-17 | Aging treatment method for rare-earth magnet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04152611A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6261515B1 (en) | 1999-03-01 | 2001-07-17 | Guangzhi Ren | Method for producing rare earth magnet having high magnetic properties |
| JP2022056372A (en) * | 2020-09-29 | 2022-04-08 | 煙台東星磁性材料株式有限公司 | METHOD OF MANUFACTURING Nd-Fe-B BASED MAGNETIC BODY, CAPABLE OF ADJUSTING GRAIN BOUNDARY |
-
1990
- 1990-10-17 JP JP2277964A patent/JPH04152611A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6261515B1 (en) | 1999-03-01 | 2001-07-17 | Guangzhi Ren | Method for producing rare earth magnet having high magnetic properties |
| JP2022056372A (en) * | 2020-09-29 | 2022-04-08 | 煙台東星磁性材料株式有限公司 | METHOD OF MANUFACTURING Nd-Fe-B BASED MAGNETIC BODY, CAPABLE OF ADJUSTING GRAIN BOUNDARY |
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