JPS596350A - Rare earth element cobalt material for magnet and preparation thereof - Google Patents

Abstract

PURPOSE:To provide a magnet material having a max. energy product equal to or more than that of a conventional one, low in cost and easy in preparation, obtained by containing a rare earth element, Fe, Cu and Zr in Co in a specific ratio. CONSTITUTION:In a powder sintering type R2T17 type magnet alloy (wherein R is Y and a rare earth element, T is a transition metal), a alloy powder consisting of, on the basis of a wt%, 22.5-27.5% R, 15.0-23.0% Fe, 3.3-5.0% Cu, 1.5- 3.5% Zr and the remainder Co is molded under pressure to be sintered at 1,170- 1,230 deg.C. In the next step, the sintered alloy is subjected to solution heat-treatment at 1,130-1,200 deg.C and, thereafter, cooled at a ratio of 1,500-1,000 deg.C/hr. Subsequently, the treated alloy is heated to be held at 600-950 deg.C and cooled to 500 deg.C at a cooling speed of 0.05-5 deg.C/min. By this method, even if a Co amount is reduced, a magnet material having high magnetic characteristics can be simply prepared.

Description

【発明の詳細な説明】 本発明は’　Ｒ２Ｃｏ１７金属間化合物（ここでＲはイ
ツトリウム及び希土類元素の少くとも一種を表す）を主
体とするＲ−Ｃｏ−Ｃｕ−Ｆｅ系粉末焼結型永久磁石材
料およびその製造方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention provides an R-Co-Cu-Fe powder sintered permanent magnet material mainly composed of an R2Co17 intermetallic compound (where R represents at least one of yttrium and a rare earth element). and its manufacturing method.

Ｒ−Ｃｏ−Ｃｕ−Ｆｅ合金磁石材料としては、従来では
Ｃｕ　１０　ｗｔ％程度以上、　Ｆｅ　６　ｗｔ％以下
とするのが普通であった。その理由はＣｕの添加量がこ
れよのとされていた。Conventionally, the R-Co-Cu-Fe alloy magnet material has generally been about Cu 10 wt% or more and Fe 6 wt% or less. The reason for this was thought to be the amount of Cu added.

ところで、Ｃｕ１０ｗｔ％程度とし＋　Ｆｅ　３　ｗｔ
　％以下とすると、必然的にＣｏの含有量が増加し、高
価以１下とした従来のＲ−Ｃｏ　−Ｃｕ　−Ｆｅ系永久
磁石においては、その製造過程において、溶体化処理後
ＲＣｏ　ｓ相の析出を抑えるため急冷し々ければ々らな
かった。しかしながら、急冷はそれ自体困難な操作であ
シ、冷却媒体を多く必要とするばかシで力く、製品に割
れを生じ易く１歩留を低くする原因にもなっている。By the way, Cu is about 10 wt% + Fe 3 wt
% or less, the Co content inevitably increases, and in the conventional R-Co-Cu-Fe permanent magnets, which are expensive or less, the RCo s phase is removed after solution treatment in the manufacturing process. Rapid cooling was necessary to suppress precipitation. However, quenching is a difficult operation in itself, requires a large amount of cooling medium, and is very forceful, which tends to cause cracks in the product and lowers the yield.

また、従来の製造方法では、溶体化処理後、多段時効を
行なっているが、その場合、高い保磁力が得られるが、
４πｌ８−Ｈ曲線の第２象限において。In addition, in conventional manufacturing methods, multi-stage aging is performed after solution treatment, but in that case, a high coercive force can be obtained, but
In the second quadrant of the 4πl8-H curve.

角型性が悪く、肩が丸くなるという欠点があった。It had the disadvantage of poor squareness and rounded shoulders.

本発明は、この点に鑑み、最大エネルギー積（Ｂ　Ｈ）
ｍａＸ・とじて従来と同等以上のものが得られ・安価で
しかも製造容易２歩留の高い焼結型Ｒ−Ｃ。In view of this point, the present invention provides the maximum energy product (B H)
A sintered type R-C that can obtain maX and better results than conventional products, is inexpensive, easy to manufacture, and has a high yield.

−Ｃｕ　−Ｆｅ系永久磁石材料およびその製造方法を提
供することを目的とする。An object of the present invention is to provide a -Cu-Fe based permanent magnet material and a method for manufacturing the same.

本発明の他の目的は、低Ｃｕ　、高Ｆｅ含有としてＣｏ
量を少なくしながら、従来と同等以上の磁気特性を有し
、しかも４πｌ８−Ｈ曲線の角型性の良いＲ−Ｃｏ−Ｃ
ｕ−Ｆｅ系永久磁石材料およびその製造方法を提供する
ことである。Another object of the present invention is to use Co as a low Cu, high Fe content.
R-Co-C has magnetic properties equivalent to or better than conventional ones while reducing the amount, and has good squareness of the 4πl8-H curve.
An object of the present invention is to provide a u-Fe permanent magnet material and a method for manufacturing the same.

本発明の材料は、粉末焼結型Ｒ２Ｔ１７系磁石合金（と
こでＲはイツトリウム及び希土類元素、Ｔは遷移金属を
表わす。）において、Ｒを２２５〜２７、５　ｗｔチ、
Ｆｅを１５．０〜２３．０　ｗｔ％、　Ｃｕを３．３〜
５．Ｏｗｔ％＋　ｚｒを１．５〜３．５　ｗｔ　％　、
　Ｃｒ２を残部とした希土類コバルト系磁石材料である
。The material of the present invention is a powder sintered R2T17 magnet alloy (where R represents yttrium and a rare earth element, and T represents a transition metal), in which R is 225 to 27.5 wt.
Fe 15.0~23.0 wt%, Cu 3.3~
5. Owt% + zr 1.5 to 3.5 wt%,
It is a rare earth cobalt based magnet material with Cr2 as the balance.

本発明の第１の製造方法は、粉末焼結型Ｒ２Ｔ１７系磁
石合金（ここで〆イットリウム及び希土類元素、Ｔは遷
移金属を表わす。）において、Ｒを２２．５〜２７．５
　ｗｔ％、　Ｆｅを１５．０〜２３．Ｏｗｔ％。In the first manufacturing method of the present invention, R is 22.5 to 27.5 in a powder sintered R2T17 magnet alloy (here, yttrium and a rare earth element, T represents a transition metal).
wt%, Fe 15.0-23. Owt%.

Ｃｕを３．３〜５．０　ｗｔ％　、　Ｚｒを１．５〜３
．５　ｗｔ％、Ｇ。Cu: 3.3-5.0 wt%, Zr: 1.5-3
．． 5 wt%, G.

を残部とする合金粉末を作り、該合金粉末を加圧成形し
て１１７０℃〜１２３０℃で焼結した後。After preparing an alloy powder with the remainder being , the alloy powder is press-molded and sintered at 1170°C to 1230°C.

１１３０℃〜１２００℃で溶体化処理後１５００℃／一
時間〜１０００℃／時間の割合で空冷し２次に６００〜
９５０℃に加熱保持後０９０５〜ｂ分の冷却速度で５０
０℃迄冷却することを特徴とする希土類コバルト系磁石
材料の製造方法である。After solution treatment at 1130°C to 1200°C, air cooling at a rate of 1500°C/1 hour to 1000°C/hour and then 600°C/hour.
50 at a cooling rate of 0905-b after heating and holding at 950℃
This is a method for producing a rare earth cobalt magnet material, which is characterized by cooling to 0°C.

本発明の第２の製造方法はＲ２Ｔ１７系合金磁石（ここ
で、Ｒはイツトリウムおよび希土類元素。The second manufacturing method of the present invention is an R2T17 alloy magnet (where R is yttrium and a rare earth element).

Ｔ１は遷移金属を表わす。）を粉末冶金法によって製造
する方法において、Ｒを２２．５〜２７．５　ｗｔ係。T1 represents a transition metal. ) by a powder metallurgy method, in which R is 22.5 to 27.5 wt.

Ｆｅを１５．０〜２３．　Ｏｗｔ％、　ＣＵを３．３〜
５．Ｑ　ｗｔ　％　。Fe from 15.0 to 23. Owt%, CU 3.3~
5. Qwt%.

Ｚｒを１．５〜３．５　ｗｔ％、　ｃｏを残部とする合
金粉末を作り、該合金粉末を加圧成形して１１７０℃〜
１２３０℃で焼結した後、１１３０℃〜１２００℃で溶
体化処理後行い、その後、７５０℃〜９００℃に加熱保
持後０．０５〜ｂ 度で冷却する加熱−保持−冷却のサイクルを少々くとも
２回行うことを特徴とする希土類コバルト系磁石材料の
製造方法である。An alloy powder containing 1.5 to 3.5 wt% of Zr and the balance of cobalt is prepared, and the alloy powder is press-molded to 1170°C~
After sintering at 1230°C, solution treatment is performed at 1130°C to 1200°C, followed by a heating-holding-cooling cycle of heating and holding at 750°C to 900°C and cooling at 0.05 to 100°C. This is a method for producing a rare earth cobalt magnet material, which is characterized in that both steps are carried out twice.

本発明によれば、Ｃｕが３．３〜５．　Ｏｗｔ　％と少
ないがＦｅが１５．０〜２３．Ｏｗｔ％と多（Ｚｒ　１
．５〜３．５ｗｔ％を使用するため、全体としてＣｏ量
が少なくなるので安価となる。またこのようにＣｕを減
少し。According to the present invention, Cu is 3.3 to 5. Although the Owt% is small, Fe is 15.0 to 23. Owt% and many (Zr 1
．． Since 5 to 3.5 wt% is used, the overall amount of Co is reduced, resulting in low cost. In addition, Cu is reduced in this way.

Ｆｅを多く用いているがｒ　Ｚｒを１．５〜３．５　ｗ
ｔ％含有させることによシ、残留磁束密度Ｂｒを１０　
ＫＧａｕｓｓ以上、保磁力ＩＩ（ｃを９　ＫＯｅ以上’
　（”Ｈ）ｍａＸを２４（ＭＧａｕｓｓ　Ｏｅ　）以上
と、従来と同等以上の特性を得ることができる。Although a large amount of Fe is used, r Zr is 1.5 to 3.5 w
By containing t%, the residual magnetic flux density Br can be reduced to 10
K Gauss or more, coercive force II (c more than 9 KOe'
With ("H)maX of 24 (MGauss Oe) or more, it is possible to obtain characteristics equivalent to or better than conventional ones.

更に２本発明によれば、　Ｃｕが３．３〜５．　Ｏｗｔ
係と少ないので、溶体化処理後の冷却において、析出物
（ＲＯ５相）の出る恐れがほとんどなく、冷却をブロア
ーによる強制空冷によって行うことで充分であることが
わかった。なおＣｕ量が５．　Ｏｗｔ　％よシ多くなる
と、溶体化処理後、やはシ急冷を必要とする。Furthermore, according to the present invention, Cu is 3.3 to 5. Owt
It was found that there was little risk of the formation of precipitates (RO5 phase) during cooling after solution treatment, and that cooling by forced air cooling using a blower was sufficient. Note that the amount of Cu is 5. If the amount exceeds Owt%, rapid cooling is required after solution treatment.

更に２本発明の第２の製造方法によれば４πｌ８−Ｈ曲
線の角型性を改良できる。Furthermore, according to the second manufacturing method of the present invention, the squareness of the 4πl8-H curve can be improved.

以下２本発明を実施例について詳細に説明する。The present invention will be described in detail below with reference to two examples.

実施例１ Ｓｍが２２．０〜２８．０　ｗｔ％、　Ｆｅが１５．０
〜２４．０ｗｔ％　、　Ｃｕが３０〜５．０　ｗｔ％、
　Ｚｒが１．５〜３．５ｗｔ％、残部Ｃｏの組成で示さ
れる合金となるように原料を調合し、この混合物をアル
コ８ン算囲気中で、′高周波加熱によ”Ｒ２Ｔ１７系合
金を溶解した。Example 1 Sm: 22.0 to 28.0 wt%, Fe: 15.0
~24.0wt%, Cu 30~5.0wt%,
The raw materials were prepared to form an alloy with a composition of 1.5 to 3.5 wt% Zr and the balance Co, and this mixture was heated by high-frequency heating to melt the R2T17 alloy. did.

この合金を粗粉砕し、ゴールミルを用いて平均粒径的４
μｍに微粉砕した。This alloy was coarsely ground, and using a goal mill, the average particle size was 4.
It was pulverized to micrometers.

この粉末を１０ＫＯｅの磁場中＋　１　ｔｏｎ／儒２の
圧力で成形した。成形物をＡｒ雰囲気中、１１７０℃〜
１２３０℃で１〜２時間焼結した後、１１３０℃〜１２
００℃で溶体化処理を行った後、ブロワ−で１５００℃
〜１０００℃／時間で空冷した。This powder was compacted at a pressure of +1 ton/F2 in a magnetic field of 10 KOe. The molded product is heated to 1170°C in an Ar atmosphere.
After sintering at 1230℃ for 1-2 hours, 1130℃~12
After solution treatment at 00°C, heat to 1500°C with a blower.
Air cooling was performed at ~1000°C/hour.

次にこの試料を６００〜９５０℃で０．２〜３０時間保
持した後、０．０５〜ｂ 速度で５００℃以下まで冷却した。試料の組成を種々変
化させた場合の磁気特性を夫々、第１図。Next, this sample was held at 600-950°C for 0.2-30 hours, and then cooled to below 500°C at a rate of 0.05-b. Figure 1 shows the magnetic properties when the composition of the sample was variously changed.

第２図、第３図、第４図に示す。It is shown in FIGS. 2, 3, and 4.

第１図はＳｍを２２．０〜２８．　Ｏｗｔ％と変えｒ　
Ｆｅ１９、　Ｏｗｔ＄、　Ｃｕ　４．５　ｗｔ％、　Ｚ
ｒ　２．６　ｗｔ％、残部Ｃ’０とした場合の特性であ
る。第２図社、Ｓｍ２６．０ｗｔ％　＋　Ｆｅを１５．
０〜２４．Ｏｗｔ％と変え、　Ｃｕ　４．８ｗｔチ＋　
Ｚｒ　２．４　ｗｔ％、残部Ｃｏとした場合である。Figure 1 shows Sm between 22.0 and 28. Change to Owt%r
Fe19, Owt$, Cu 4.5 wt%, Z
These are the characteristics when r is 2.6 wt% and the remainder is C'0. 2nd company, Sm26.0wt% + Fe 15.
0-24. Change it to Owt%, Cu 4.8wt +
This is the case where Zr is 2.4 wt% and the balance is Co.

第３図はｒ　Ｓｍ　２６．３　ｗｔ％＋　Ｆｅ　２０．
５　Ｗｔ４．Ｃｕを３．０〜５０ｗｔ％と変えｐ　Ｚｒ
　２．５　ｗｔ％、残部ＣＯと　　　　゛した場合であ
る。第４図はｒ　Ｓｍ　２６．２　ｗｔ％、　Ｆｅ１９
．５　ｗｔ％、　Ｃｕ　４．９　ｗｔ％、　Ｚｒを１．
５〜３．５　ｗｔ％と変え、残部Ｃｏとした場合である
。Figure 3 shows r Sm 26.3 wt% + Fe 20.
5 Wt4. By changing Cu to 3.0 to 50 wt%, p Zr
2.5 wt%, with the remainder being CO. Figure 4 shows r Sm 26.2 wt%, Fe19
．． 5 wt%, Cu 4.9 wt%, Zr 1.
This is a case where the content is changed to 5 to 3.5 wt% and the balance is Co.

チ以上ではＢｒおよびＨｅが低下し、従って（ＢＨ）ｍ
ａＸも低下する。この結果Ｓｍの量は２２．５〜２７５
ｗｔチと限定される。Above H, Br and He decrease, and therefore (BH)m
aX also decreases. As a result, the amount of Sm is 22.5 to 275
Limited to wt chi.

第２図に関して、　Ｆｅ含有量が２３４よシも多くなる
と保磁力ｔＨｃが低下しｐ　（ＢＨ）ｍａｘも急激に低
下する。また、１５％よシ少ないとｘＨｃが１０ＫＯｅ
にみたなくなる。従ってＦｅは１５〜２３チとする。Regarding FIG. 2, when the Fe content increases beyond 234, the coercive force tHc decreases and p (BH)max also decreases rapidly. Also, if it is less than 15%, xHc will be 10KOe
It disappears. Therefore, the Fe content is set to 15 to 23.

第３図に関して、Ｃｕ量は３３％以下ではｒＨｃが低下
し５チ以上とするとＢｒが低下してしまう。またＣｕが
５チより多いと、溶体化処理後の冷却時にＲＣｏ　ｓ相
が析出しゃすくなシ、急冷を必要とする。Regarding FIG. 3, when the Cu amount is less than 33%, rHc decreases, and when it is more than 5%, Br decreases. Moreover, if the Cu content is more than 5, the RCos phase will not precipitate during cooling after solution treatment, and rapid cooling will be required.

従って、　Ｃｕは３．３〜５．Ｏｗｔ％とする。Therefore, Cu is 3.3 to 5. Owt%.

第４図に関しては、ｚｒの含有量が１．５〜３．５ｗｔ
％の範囲を越えるとＢｒおよび工、ネルギー積（ＢＨ）
ｍａｙが低下してしまう。Regarding Figure 4, the content of zr is 1.5 to 3.5wt.
If the range of % is exceeded, Br and energy product (BH)
may decrease.

実施例２ Ｓｍが２５．３　ｗｔ％、　Ｆｅが１９．０ｗｔ％の場
合と２１、　Ｏｗｔ％の場合、　Ｃｕが４．８　Ｗｔ　
％　＋　Ｚｒが２．５ｗ１％、Ｃｏ残部なる合金を実施
例１と同様にして。Example 2 When Sm is 25.3 wt%, Fe is 19.0 wt% and 21.0 wt%, Cu is 4.8 Wt
%+Zr was 2.5w1%, and the remaining Co was the same as in Example 1.

溶解、粉砕、磁場成形した。Melted, crushed, and magnetically molded.

この成形物をＡｒ雰囲気中１２１０℃で１時間保持した
後、　１１−８０℃で１時間溶体化処理を行った。この
試料を７５０℃〜９００℃で０．５〜２０時間保持した
後、０．０５〜ｂ 却速度で５００℃以下まで冷却した後７５０℃〜９００
℃で０〜５時間保持し、０．０５〜ｂの範囲の冷却速度
で５００℃以下まで冷却した。This molded product was maintained at 1210° C. for 1 hour in an Ar atmosphere, and then subjected to solution treatment at 11-80° C. for 1 hour. After holding this sample at 750°C to 900°C for 0.5 to 20 hours, cooling to 500°C or less at a cooling rate of 0.05 to 750°C to 900°C.
℃ for 0 to 5 hours and cooled to below 500℃ at a cooling rate in the range of 0.05 to b.

その試料の磁気特性を表−１に示す。The magnetic properties of the sample are shown in Table 1.

表−１中、試料通の奇数のものは従来法の熱処理で１回
のみ処理に対し、試料形が偶数の試料は熱処理を２回施
こした場合である。これらの結果から、保持時間の合計
が同じであっても冷却を２回即ち熱処理を２回施こりせ
ばＨｅ　ｒ　（ＢＨ）ｍａｘが大巾に改善される。In Table 1, the odd numbered samples were heat treated only once by the conventional method, while the even numbered samples were heat treated twice. From these results, even if the total holding time is the same, Her (BH)max can be greatly improved by performing cooling twice, that is, performing heat treatment twice.

以下余白 実験届イの場合Ｒを２２．５〜２７．５　ｗｔ％、　Ｆ
ｅ１９　ｗｔ％＋　’−Ｃｕ　３．３〜５．　Ｏｗｔ　
９’　＊　Ｚｒを１．５〜３．５ｗｔ％、Ｇｏを残部と
する組成で試料１の場合の熱処理条件は７５０℃、２０
時間保持後１℃／ｍ　１　ｎで冷却、試料２の場合の熱
処理条件は７５０℃１５時磁気特性を比較してみると保
磁力゛については試料ｌで６　ＫＯｅ　、試料２で９　
ＫＯｅと試料２の方が大きく、最大エネルギー積（ＢＨ
）ｍａｘも試料１で２２ＭＧＯｅ　＋試料２で２８．５
　ＭＧＯｅ　　と試料２の方がはるかに大きいことが明
らかである。即ち、熱処理を２回施すことによ５Ｈｃお
よび角形比を大きくシ。In the case of the margin experiment report A below, R is 22.5 to 27.5 wt%, F
e19 wt%+'-Cu 3.3-5. Owt
9' * The heat treatment conditions for sample 1, which has a composition of 1.5 to 3.5 wt% Zr and the balance of Go, are 750°C and 20°C.
After holding for a time, cooling at 1°C/m 1 n, the heat treatment conditions for sample 2 were 750°C and 15 hours. Comparing the magnetic properties, the coercive force was 6 KOe for sample 1 and 9 KOe for sample 2.
KOe and sample 2 are larger, and the maximum energy product (BH
)max is also 22MGOe for sample 1 + 28.5 for sample 2
It is clear that MGOe and sample 2 are much larger. That is, by applying heat treatment twice, 5Hc and squareness ratio can be greatly reduced.

（ＢＨ）ｍａＸが増大することが明らかである。It is clear that (BH)maX increases.

実験への場合Ｆｅ　２１　ｗｔ％とＦｅ含有量を変えて
も従来の方法である試料１１よシ試料１２の方が保磁力
も最大エネルギー積もはるかに良いことがわかる。In the case of the experiment, it can be seen that even if the Fe content is changed to Fe 21 wt%, sample 12 is much better in coercive force and maximum energy product than sample 11, which is the conventional method.

なお希土類金属ＲとしてはＳｍの他に同等の化学的特性
を有するＹ　、　Ｌａ　、　Ｃｅ　ｒ　Ｐｒ　、　Ｎａ
　ｒ　Ｅｕ　ｒＧｄ　＋　Ｔｂ　ｒ　Ｄｙ　ｒ　Ｈｏ　
＋　Ｅｒ　ｒ　Ｔｍ　＋　Ｙｂ　、　Ｌｕを用いること
ができる。In addition to Sm, rare earth metals R include Y, La, Cer Pr, and Na, which have similar chemical properties.
r Eu rGd + Tb r Dy r Ho
+ Er r Tm + Yb and Lu can be used.

本発明は２以上のような構成よシなるものでＲを２２−
５〜２７．５　ｗｔ　％　ｒ　Ｆｅを１５．０〜２３．
Ｏｗｔ％。The present invention has a configuration in which R is 2 or more, and R is 22-
5 to 27.5 wt % r Fe to 15.0 to 23.
Owt%.

Ｃｕを３．３〜５．　Ｏｗｔ％、　Ｚｒを１．５〜３．
５　ｗｔ−％　＋　Ｃ。Cu from 3.3 to 5. Owt%, Zr 1.5-3.
5 wt-% + C.

を残部とする組成によシ、高い磁気特性を得ながら＋Ｃ
ｏ量を減少し、製造を簡単化することができる。+C while obtaining high magnetic properties due to the composition with the balance being
It is possible to reduce the amount of o and simplify manufacturing.

【図面の簡単な説明】[Brief explanation of drawings]

第１〜４図は２本発明の実施例の磁気特性を示すグラフ
で、第１図はＳｍの量に対する最大エネルギー積（ＢＨ
）ｍａｘ　＊残留磁束密度Ｂｒ＋および保磁力ｗＨｃの
変化を示し、第２〜４図はそれぞれ、　Ｆｅ　ｒＣｕ　
、およびＺｒの量に対する（Ｂ　Ｈ）ｍａｚ　＋　Ｂｒ
　＋　ｒＨｃの変化を示すグラフである。 第１図 第２図 第３図 Ｃｕ（ｗｔ％） 第４図 Ｚｒ　（ｗｔ％）Figures 1 to 4 are graphs showing the magnetic properties of the two embodiments of the present invention, and Figure 1 is the maximum energy product (BH
)max *Changes in residual magnetic flux density Br+ and coercive force wHc are shown in Figures 2 to 4, respectively.
, and (B H) maz + Br for the amount of Zr
+ is a graph showing changes in rHc. Figure 1 Figure 2 Figure 3 Cu (wt%) Figure 4 Zr (wt%)

Claims (1)

【特許請求の範囲】 １、　粉末焼結型Ｒ２Ｔ、７系磁石合金（ここでＲはイ
ツトリウム及び希土類元素、Ｔは遷移金属を表わす。）
において、Ｒを２２．５〜２７．５　ｗｔ％、Ｆｅを１
５．０〜２３．Ｏｗｔ％ｒ　Ｃｕを３．３〜５．　Ｏｗ
ｔ％。 Ｚｒを１．５〜３．５　ｗｔチ＋　ＣＯを残部とした希
土類コバルト系磁石材料。 ２、粉末焼結型Ｒ２Ｔ１７系磁石合金（ここでＲはイツ
トリウム及び希土類元素、Ｔは遷移金属を表わす。）の
製造方法において、Ｒを２２，５〜２７．５ｗｔ　％　
＋　Ｆｅを１５．０〜２３．　Ｏｗｔ％、　Ｃｕを３．
３〜５．Ｏｖ／ｌ　％　ｒ　Ｚｒを１．５〜３．５　ｗ
ｔ％ｒ　Ｃｏを残部とする合金粉末を作シ、該合金粉末
を加圧成形して１１７０℃〜１２３０℃で焼結した後、
１１３０℃〜１２００℃で溶体化処理後１５００℃／時
間〜１０００℃／時間の割合で空冷し２次に６００〜９
５０℃に加熱保持後０．０５〜ｂ 迄冷却することを特徴とする希土類コバルト系磁石材料
の製造方法。 ３、Ｒ２Ｔ１７系合金磁石（ここでＲはイツトリウム及
び希土類元素、Ｔは遷移金属を表わす。）を粉末冶金法
によって製造する方法において、Ｒを２２、５〜２７．
５　ｗｔ％、　Ｆｅを１５．０〜２３．Ｏｗｔ％。 Ｃｕを３．３〜５．　Ｏｗｔチ、Ｚｒを１．５〜３．５
　ｗｔ　％　、　ＣＯを残部とする合金粉末を作シ、該
合金粉末を加圧成形して１１７０℃〜１２３０℃で焼結
した後。 １１３０℃〜１２００℃で溶体化処理を行々い。 その後、７５０℃〜９００℃に加熱保持後、０．０５〜
ｂ 持−冷却のサイクルを少くとも２回行うことを特徴とす
る希土類コバルト系磁石材料の製造方法。[Claims] 1. Powder sintered R2T, 7-series magnetic alloy (R represents yttrium and rare earth elements, and T represents a transition metal.)
In, R was 22.5 to 27.5 wt%, Fe was 1
5.0-23. Owt%r Cu from 3.3 to 5. Ow
t%. A rare earth cobalt-based magnet material containing 1.5 to 3.5 wt Zr + CO as the balance. 2. In the method for producing a powder sintered R2T17 magnet alloy (where R represents yttrium and a rare earth element, and T represents a transition metal), R is 22.5 to 27.5 wt%.
+ Fe from 15.0 to 23. Owt%, Cu 3.
3-5. Ov/l % r Zr 1.5~3.5w
After producing an alloy powder with the balance being t%r Co, pressing the alloy powder and sintering it at 1170°C to 1230°C,
After solution treatment at 1130°C to 1200°C, it is air cooled at a rate of 1500°C/hour to 1000°C/hour and then heated to 600°C to 90°C.
A method for producing a rare earth cobalt-based magnet material, which comprises heating and holding at 50°C and then cooling to 0.05-b. 3. In a method for manufacturing an R2T17 alloy magnet (where R represents yttrium and a rare earth element, and T represents a transition metal) by a powder metallurgy method, R is 22, 5 to 27.
5 wt%, Fe 15.0-23. Owt%. Cu from 3.3 to 5. Owtchi, Zr 1.5 to 3.5
After producing an alloy powder with wt % and CO as the balance, the alloy powder was press-molded and sintered at 1170°C to 1230°C. Solution treatment was carried out at 1130°C to 1200°C. After that, after heating and holding at 750℃~900℃, 0.05~
b. A method for producing a rare earth cobalt-based magnet material, characterized by carrying out a holding-cooling cycle at least twice.