JP2004035998A

JP2004035998A - Permanent magnet alloy for jewelry and production method

Info

Publication number: JP2004035998A
Application number: JP2002232126A
Authority: JP
Inventors: Takafumi Nakayama; 中山　孝文; Yuetsu Murakami; 村上　雄悦
Original assignee: Elect & Magn Alloys Res Inst; Kuwayama KK; Research Institute for Electromagnetic Materials
Current assignee: Elect & Magn Alloys Res Inst; Kuwayama KK; Research Institute for Electromagnetic Materials
Priority date: 2002-07-05
Filing date: 2002-07-05
Publication date: 2004-02-05

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a permanent magnet alloy for jewelry which has a high residual magnetic flux density and a high coercive force, to provide a production method therefor, and to provide equipment for medical purpose and electromagnetic equipment obtained by using the same. <P>SOLUTION: The permanent magnet alloy comprises, by weight, 83 to 87% Pt, and one or more kinds selected from Co, Ni, Cu, Mn, Pd, Ag, Au, Cr, Mo, W, Al, Si, Ti, Zr, Hf, V, Nb, Ta, In, Ge, Sn, Re, Ru, Os, Rh, Ir, rare earth elements, Ca and a Ca-fluorine compound, and the balance Fe. The alloy has a residual magnetic flux density of ≥2,000 gauss and a coercive force of ≥200 oersted. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【産業上の利用分野】
本発明は、Ｆｅ（鉄）およびＰｔ（白金）からなる宝飾用永久磁石合金、あるいはこれを主成分とし、副成分としてＣｏ（コバルト），Ｎｉ（ニッケル），Ｃｕ（銅），Ｍｎ（マンガン），Ｐｄ（パラジウム），Ａｇ（銀），Ａｕ（金），Ｃｒ（クロミウム），Ｍｏ（モリブデン），Ｗ（タングステン），Ａｌ（アルミニウム），Ｓｉ（シリコン），Ｔｉ（チタニウム），Ｚｒ（ジルコニウム），Ｈｆ（ハフニウム），Ｖ（バナジウム），Ｎｂ（ニオビウム），Ｔａ（タンタル），Ｉｎ（インジウム），Ｇｅ（ゲルマニウム），Ｓｎ（錫），Ｒｅ（レニウム），Ｒｕ（ルテニウム），Ｏｓ（オスミウム），Ｒｈ（ロジウム），Ｉｒ（イリジウム），希土類元素，ＣａおよびＣａフッ素化合物の１種または２種以上からなる宝飾用永久磁石合金およびその製造法ならびにこれを用いた医療用器具および電磁機器に関するもので、その目的とするところは、残留磁束密度および保磁力が大きい宝飾用永久磁石合金を得ることにある。
【０００２】
【従来の技術】
Ｆｅ−Ｐｔ系２元合金においては、Ｆｅ−５０原子％Ｐｔ合金は規則格子のγ_１相から不規則格子のγ相への変態温度が約１３２０℃と高温度であるため、水焼入れによる急冷でも規則化が進行して過時効の状態となり、最大エネルギー積の大きな磁石合金が得られない。そこで、Ｆｅ−Ｐｔ系合金の組成を、変態温度が比較的低いＦｅ側に移動して、容易に不規則格子のγ相が得られるようにし、これに時効処理を加えて規則格子のγ_１相に変態させた規則化の初期状態または母相のγ相の地に微細なγ_１相が均一に分散した状態とすることによって、最大エネルギー積の大きな磁石合金が得られている（特公平３−３５８０１号）。
【０００３】
【発明が解決しようとする課題】
Ｆｅ−Ｐｔ系合金の永久磁石特性は、均一な不規則格子γ相中における規則化の初期状態またはγ相の地に微細な規則格子γ_１相が均一に分散した状態において、残留磁束密度および保磁力が大きくなり、最も高いエネルギー積を示す。そのため、初期において規則格子γ_１相の生成を抑制するため、規則格子変態温度以上の高温度から急冷処理を施す。しかし、この変態温度が非常に高い領域にあり、高磁石特性を有する合金を再現性良く、多量に生産することの妨げとなっており、これを改善することが強く望まれている。またＦｅ−Ｐｔ系において貴金属品位証明極印が得られる８５重量％以上のＰｔを含む合金は、磁石特性を示さない反強磁性金属間化合物ＦｅＰｔ_３が形成される組成の近傍にあり、高い磁石特性を安定して得ることが困難であるが、この点も改良が望まれている。
【０００４】
【課題を解決するための手段】
本発明は、貴金属品位証明極印が得られるＦｅ−Ｐｔ系合金の磁石特性、磁石特性の再現性、鋳造性および加工性等を改善することを目的としている。
即ち、本発明は重量パーセントにて、主成分としてＰｔ８３〜８７％と、副成分としてＣｏ，Ｎｉ，Ｃｕ，Ｍｎ，Ｐｄ，Ａｇ，Ａｕ，Ｃｒ，Ｍｏ，Ｗのそれぞれ５％以下、Ａｌ，Ｓｉ，Ｔｉ，Ｚｒ，Ｈｆ，Ｖ，Ｎｂ，Ｔａ，Ｉｎ，Ｇｅ，Ｓｎ，Ｒｅ，Ｒｕ，Ｏｓ，Ｒｈ，Ｉｒ，希土類元素のそれぞれ３％以下、ＣａおよびＣａフッ素化合物のそれぞれ０．５％以下の１種または２種以上の合計０．０００１〜１０％以下および残部Ｆｅと少量の不純物とからなる合金で、真空中又は種々なガス雰囲気、例えばアルゴン、メタン、水素、窒素等のガス中において適当な溶解法、例えば高周波誘導溶解法、電流加熱炉法、アーク溶解法等によって溶湯となし、適当な鋳型、例えば金型、耐火物からなる鋳型などに鋳込むことにより、健全な鋳塊が得られる。
【０００５】
磁石特性の向上を図るためには、これを規則格子変態温度以上の７００℃以上融点以下の温度で適当時間、例えば１分間以上５００時間以下、望ましくは５分間以上３００時間以下加熱して溶体化した後、１００℃／時以上、望ましくは３００℃／時以上の速度で冷却することによって不規則格子相を形成する。ついで、直ちにかあるいは必要に応じて加工率１０％以上、望ましくは２０％以上の冷間加工を施した後規則格子変態温度以下の２００℃以上１１００℃以下、望ましくは３００℃以上１０００℃以下の温度で適当時間、例えば１分間以上１０００時間以下、望ましくは５分間以上８００時間以下加熱し、冷却する。あるいは、鋳造後または７００℃以上融点以下の温度において１分間以上５００時間以下加熱し、不規則格子相に成した後、１℃／時以上１００℃／秒以下の適当な速度で冷却することにより適度な規則格子相が形成され、残留磁束密度２，０００ガウス以上および保磁力２００エルステッド以上の宝飾用永久磁石合金が得られる。
【０００６】
これらの永久磁石合金は磁石特性に優れ、且つ白金含有量が多いため貴金属品位証明極印が受けられるので、宝飾用品、例えばファッションリング（指輪）、ブレスレット、ネックレス、ペンダントおよびピアス等に好適である。また、一般的な磁気医療用具、例えば貼付用磁石、宝飾用吸着器具等あるいは電磁機器、例えば心電計アクチュエーター、電磁探針等にも応用できる。
【０００７】
本発明の特徴とするところは次の通りである。
［第１発明］
重量パーセントにて、Ｐｔ８３〜８７％および残部Ｆｅと少量の不純物とからなり、残留磁束密度２，０００ガウス以上および保磁力２００エルステッド以上を有することを特徴とする宝飾用永久磁石合金に関する。
【０００８】
［第２発明］
重量パーセントにて、主成分としてＰｔ８３〜８７％と、副成分としてＣｏ，Ｎｉ，Ｃｕ，Ｍｎ，Ｐｄ，Ａｇ，Ａｕ，Ｃｒ，Ｍｏ，Ｗのそれぞれ５％以下、Ａｌ，Ｓｉ，Ｔｉ，Ｚｒ，Ｈｆ，Ｖ，Ｎｂ，Ｔａ，Ｉｎ，Ｇｅ，Ｓｎ，Ｒｅ，Ｒｕ，Ｏｓ，Ｒｈ，Ｉｒ，希土類元素のそれぞれ３％以下、ＣａおよびＣａフッ素化合物のそれぞれ０．５％以下の１種または２種以上の合計０．０００１〜１０％以下および残部Ｆｅと少量の不純物とからなり、残留磁束密度２，０００ガウス以上および保磁力２００エルステッド以上を有することを特徴とする宝飾用永久磁石合金に関する。
【０００９】
［第３発明］
重量パーセントにて、Ｐｔ８３〜８７％および残部Ｆｅと少量の不純物とからなる合金を、７００℃以上融点以下の温度において１分間以上５００時間以下加熱して均質化処理した後１００℃／時以上の速度で冷却し、ついで２００℃〜１１００℃の温度で１分間以上１０００時間以下加熱後冷却することにより、残留磁束密度２，０００ガウス以上および保磁力２００エルステッド以上を有することを特徴とする宝飾用永久磁石合金の製造法に関する。
【００１０】
［第４発明］
重量パーセントにて、Ｐｔ８３〜８７％および残部Ｆｅと少量の不純物とからなる合金を、７００℃以上融点以下の温度において１分間以上５００時間以下加熱して均質化処理した後１００℃／時以上の速度で冷却し、ついで加工率１０％以上の冷間加工を施し、これをさらに２００℃〜１１００℃の温度で１分間以上１０００時間以下加熱後冷却することにより、残留磁束密度２，０００ガウス以上および保磁力２００エルステッド以上を有することを特徴とする宝飾用永久磁石合金の製造法に関する。
【００１１】
［第５発明］
重量パーセントにて、Ｐｔ８３〜８７％および残部Ｆｅと少量の不純物とからなる合金を、鋳造後又は７００℃以上融点以下の温度において１分間以上５００時間以下加熱して均質化処理した後、１℃／時以上１００℃／秒以下の速度で冷却することにより、残留磁束密度２，０００ガウス以上および保磁力２００エルステッド以上を有することを特徴とする宝飾用永久磁石合金の製造法に関する。
【００１２】
［第６発明］
重量パーセントにて、主成分としてＰｔ８３〜８７％と、副成分としてＣｏ，Ｎｉ，Ｃｕ，Ｍｎ，Ｐｄ，Ａｇ，Ａｕ，Ｃｒ，Ｍｏ，Ｗのそれぞれ５％以下、Ａｌ，Ｓｉ，Ｔｉ，Ｚｒ，Ｈｆ，Ｖ，Ｎｂ，Ｔａ，Ｉｎ，Ｇｅ，Ｓｎ，Ｒｅ，Ｒｕ，Ｏｓ，Ｒｈ，Ｉｒ，希土類元素のそれぞれ３％以下、ＣａおよびＣａフッ素化合物のそれぞれ０．５％以下の１種または２種以上の合計０．０００１〜１０％以下および残部Ｆｅと少量の不純物とからなる合金を、７００℃以上融点以下の温度において１分間以上５００時間以下加熱して均質化処理した後１００℃／時以上の速度で冷却し、ついで２００℃〜１１００℃の温度で１分間以上１０００時間以下加熱後冷却することにより、残留磁束密度２，０００ガウス以上および保磁力２００エルステッド以上を有することを特徴とする宝飾用永久磁石合金の製造法に関する。
【００１３】
［第７発明］
重量パーセントにて、主成分としてＰｔ８３〜８７％と、副成分としてＣｏ，Ｎｉ，Ｃｕ，Ｍｎ，Ｐｄ，Ａｇ，Ａｕ，Ｃｒ，Ｍｏ，Ｗのそれぞれ５％以下、Ａｌ，Ｓｉ，Ｔｉ，Ｚｒ，Ｈｆ，Ｖ，Ｎｂ，Ｔａ，Ｉｎ，Ｇｅ，Ｓｎ，Ｒｅ，Ｒｕ，Ｏｓ，Ｒｈ，Ｉｒ，希土類元素のそれぞれ３％以下、ＣａおよびＣａフッ素化合物のそれぞれ０．５％以下の１種または２種以上の合計０．０００１〜１０％以下および残部Ｆｅと少量の不純物とからなる合金を、７００℃以上融点以下の温度において１分間以上５００時間以下加熱して均質化処理した後１００℃／時以上の速度で冷却し、ついで加工率１０％以上の冷間加工を施し、これをさらに２００℃〜１１００℃の温度で１分間以上１０００時間以下加熱後冷却することにより、残留磁束密度２，０００ガウス以上および保磁力２００エルステッド以上を有することを特徴とする宝飾用永久磁石合金の製造法に関する。
【００１４】
［第８発明］
重量パーセントにて、主成分としてＰｔ８３〜８７％と、副成分としてＣｏ，Ｎｉ，Ｃｕ，Ｍｎ，Ｐｄ，Ａｇ，Ａｕ，Ｃｒ，Ｍｏ，Ｗのそれぞれ５％以下、Ａｌ，Ｓｉ，Ｔｉ，Ｚｒ，Ｈｆ，Ｖ，Ｎｂ，Ｔａ，Ｉｎ，Ｇｅ，Ｓｎ，Ｒｅ，Ｒｕ，Ｏｓ，Ｒｈ，Ｉｒ，希土類元素のそれぞれ３％以下、ＣａおよびＣａフッ素化合物のそれぞれ０．５％以下の１種または２種以上の合計０．０００１〜１０％以下および残部Ｆｅと少量の不純物とからなる合金を、７００℃以上融点以下の温度において１分間以上５００時間以下加熱して均質化処理した後１℃／時以上１００℃／秒以下の速度で冷却することにより、残留磁束密度２，０００ガウス以上および保磁力２００エルステッド以上を有することを特徴とする宝飾用永久磁石合金の製造法に関する。
【００１５】
［第９発明］
重量パーセントにて、Ｐｔ８３〜８７％および残部Ｆｅと少量の不純物とからなり、残留磁束密度２，０００ガウス以上および保磁力２００エルステッド以上をすることを特徴とする宝飾用永久磁石合金よりなる医療用器具に関する。
【００１６】
［第１０発明］
重量パーセントにて、主成分としてＰｔ８３〜８７％と、副成分としてＣｏ，Ｎｉ，Ｃｕ，Ｍｎ，Ｐｄ，Ａｇ，Ａｕ，Ｃｒ，Ｍｏ，Ｗのそれぞれ５％以下、Ａｌ，Ｓｉ，Ｔｉ，Ｚｒ，Ｈｆ，Ｖ，Ｎｂ，Ｔａ，Ｉｎ，Ｇｅ，Ｓｎ，Ｒｅ，Ｒｕ，Ｏｓ，Ｒｈ，Ｉｒ，希土類元素のそれぞれ３％以下、ＣａおよびＣａのフッ素化合物のそれぞれ０．５％以下の１種または２種以上の合計０．０００１〜１０％以下および残部Ｆｅと少量の不純物とからなり、残留磁束密度２，０００ガウス以上および保磁力２００エルステッド以上を有することを特徴とする宝飾用永久磁石合金よりなる医療用器具に関する。
【００１７】
［第１１発明］
重量パーセントにて、Ｐｔ８３〜８７％および残部Ｆｅと少量の不純物とからなり、残留磁束密度２，０００ガウス以上および保磁力２００エルステッド以上を有することを特徴とする宝飾用永久磁石合金よりなる電磁機器に関する。
【００１８】
［第１２発明］
重量パーセントにて、主成分としてＰｔ８３〜８７％と、副成分としてＣｏ，Ｎｉ，Ｃｕ，Ｍｎ，Ｐｄ，Ａｇ，Ａｕ，Ｃｒ，Ｍｏ，Ｗのそれぞれ５％以下、Ａｌ，Ｓｉ，Ｔｉ，Ｚｒ，Ｈｆ，Ｖ，Ｎｂ，Ｔａ，Ｉｎ，Ｇｅ，Ｓｎ，Ｒｅ，Ｒｕ，Ｏｓ，Ｒｈ，Ｉｒ，希土類元素のそれぞれ３％以下、ＣａおよびＣａフッ素化合物のそれぞれ０．５％以下の１種または２種以上の合計０．０００１〜１０％以下および残部Ｆｅと少量の不純物とからなり、残留磁束密度２，０００ガウス以上および保磁力２００エルステッド以上を有することを特徴とする宝飾用永久磁石合金よりなる電磁機器に関する。
【００１９】
次に、本発明合金の成分組成を上記の範囲に限定した理由は、白金の含有量が多いため貴金属品位証明極印を受けることができ、且つこの組成範囲では残留磁束密度が２，０００ガウス以上、保磁力が２００エルステッド以上を有し、磁石特性が優れているが、この組成範囲をはずれると磁石特性が劣化するからである。
本発明合金は、等価原子比のＦｅ−Ｐｔ合金の組成をＰｔ側に移動させて貴金属合金組成と永久磁石特性を兼備させたものである。Ｐｔが８３〜８７％の範囲においては規則格子の面心正方晶型γ_１相が存在し所期の磁石特性が得られるが、Ｐｔ量が８７％を越えると、隣接する反強磁性金属間化合物ＦｅＰｔ_３の特性によって強磁性が得られなくなり、また、Ｐｔ量が８３％に満たない合金では貴金属品位証明極印を受けられないので、Ｐｔを８３〜８７％に限定した。さらに、副成分としてＣｏ，Ｎｉ，Ｃｕ，Ｍｎ，Ｐｄ，Ａｇ，Ａｕ，Ｃｒ，Ｍｏ，Ｗのそれぞれ５％以下、Ａｌ，Ｓｉ，Ｔｉ，Ｚｒ，Ｈｆ，Ｖ，Ｎｂ，Ｔａ，Ｉｎ，Ｇｅ，Ｓｎ，Ｒｅ，Ｒｕ，Ｏｓ，Ｒｈ，Ｉｒ，希土類元素のそれぞれ３％以下、ＣａおよびＣａフッ素化合物のそれぞれ０．５％以下の１種または２種以上の合計０．０００１〜１０％以下添加すると、残留磁束密度の上昇、保磁力の増加あるいは磁気履歴曲線の角形性が良好となり、比較的大きな最大エネルギー積を有する磁石合金が得られる。
【００２０】
次に、本発明における均一化処理条件の限定理由について説明する。本発明の組成になる合金の規則格子変態点は組成によって異なり、７００〜１１００℃であり、また融点は約１６００℃にある。このため、均一化処理温度が７００℃以上でないと規則格子γ_１相が混在し、不規則格子γ単相が得られないので、７００℃以上融点以下に限定した。均一化処理時間が１分に満たないと処理効果が得られず、長時間では経済的に好ましくなく、且つ磁石特性劣化の原因となる酸化の進行が著しく増加するので、１分間以上５００時間以下に限定した。均質化処理後の冷却速度は速いことが望ましいが、１００℃／時に満たないと微細分散析出した規則格子γ_１相から成る結晶粒が粗大化し、磁石特性劣化の原因となるので、冷却速度は１００℃／時以上に限定した。
【００２１】
次に、急冷後に磁石特性を発現させる時効処理条件の限定理由について説明する。時効処理温度が２００℃に満たないと、時効時間が２０００時間以上を要し、経済的に好ましくないばかりか処理効果が得られず、磁石特性の向上が望めない。他方、１１００℃を越えると規則化が進行せず、磁石特性が得られないので、時効温度は２００〜１１００℃に限定した。なお、好適範囲は３００〜８００℃である。また加熱・冷却過程を含めた時効時間が１分に満たないと、時効温度が１１００℃でも磁石特性が得られず、他方１０００時間を越えると規則化が進行して過時効となって磁石特性が著しく劣化するので、時効処理時間は１分以上１０００時間以下に限定した。なお時効処理後の冷却速度は磁石特性に影響を与えないので、急冷、徐冷のいずれも採用できるが、速く冷却することが望ましい。
【００２２】
次に時効処理に先立って、線引又は圧延等の加工を行う場合に、加工率が１０％に満たないと、内部歪が表面層にのみ留まり、磁石特性の向上を図るには不充分なので、加工率は１０％以上に限定した。
【００２３】
【作用】
本発明でいう組成的に、また熱処理によって不完全となっているγ_１相とは、Ｆｅ−Ｐｔ２元合金では原子比にてＦｅ：Ｐｔ＝５０：５０の場合に完全規則格子になるところを、本発明では組成をＰｔ側に移動させることによってγ_１相を不完全な規則格子にしているものであり、また急冷あるいは急冷後再加熱することによってγ相から規則格子のγ_１相に変態する初期の状態が形成され、不完全なγ_１相となっているものである。この状態では、保磁力ならびに磁気履歴曲線の角形性が大きく、残留磁束密度も高くなるので、最大エネルギー積が大きくなり、本発明で所期した残留磁束密度２，０００ガウス以上および保磁力２００エルステッド以上となり、宝飾用永久磁石合金が再現性良く得られる。
【００２４】
次に本発明を行程順に詳細に説明する。
（１）本発明合金を造るには、目的の組成に秤量した金属を適当な溶解炉を用いて溶解した後充分に撹拌して組成的に均質な溶融合金を造り、これを適当な形状の鋳型に入れ鋳塊となすか、又は所定の形状に、鍛造、線引き、圧延して成形する。これを７００℃以上融点以下の温度に１分間以上５００時間以下加熱し均質化処理した後、１００℃／時間以上の冷却速度で急冷する。この工程は、規則格子変態点以上の温度に加熱され、不規則格子相化した合金を急冷することによって不規則格子の面心立方晶型γ相単体とし、その状態を常温に得て固定しようとする工程である。
【００２５】
（２）（１）の急冷後２００〜１１００℃の温度で少なくとも１分間以上１０００時間以下再加熱すると、高温において生じた不規則格子のγ相固溶体が、規則格子のγ_１相に変態する初期の状態に局所歪が生じ、磁壁の移動が阻止されることによって、大きな保磁力及び残留磁束密度を有する磁石合金が得られるのである。
この工程は、急冷することによって不規則格子の面心立方晶型γ相から規則格子の面心正方晶型γ_１相に変態する初期の状態、又は不規則格子γ相の地に規則格子γ_１相の微細結晶が均一に分散した状態を、常温に得て固定しようとする工程である。
【００２６】
（３）（１）の急冷をした後加工率１０％以上の線引き又は圧延等の冷間加工をする。
（４）（３）の冷間加工をした後（２）の焼戻処理を加える。この工程は（３）の工程で生じた内部歪が、γ_１相の変化に当って適当な局所歪と結晶の集合組織を生成させ、その結果磁気履歴曲線における角形性の向上を助長し、優秀な磁石特性が得られるのである。勿論、加工率１０％以下においても、充分ではないが、その効果が認められる。
尚、合金組成によっては、鋳造後または７００℃以上融点以下の温度において１分間以上５００時間以下加熱し均質化処理して不規則格子のγ相固溶体となした後、合金組成に適応した１℃／時以上１００℃／秒以下の適当な速度で冷却すると、冷却中にγ相固溶体の母相中に適当量の規則格子のγ_１相が変態することにより、残留磁束密度が２，０００ガウス以上および保磁力が２００エルステッド以上の磁石特性が得られるのである。
【００２７】
【実施例】
つぎに本発明の実施例につき説明する。
実施例１；試料番号２（組成Ｐｔ＝８４％、Ｐｄ＝２．０％、Ｆｅ＝残部）の合金の製造および評価。
原料として、純度９９．９９％の電解鉄、純度９９．９％の白金およびパラジウムを用いた。全重量３０ｇの原料をアルゴンガス中におけるアーク溶解法によって溶解してボタン状の鋳造母材を作製し、これをアルミナ柑禍に入れて真空中、高周波誘導溶解炉によって溶解した後、直径３．５ｍｍの円柱状の孔をもつ鋳型に注入した。得られた丸棒から３０ｍｍの長さを切り取り、表１に示すような熱処理および冷間加工を施し、磁石特性を測定した。
【００２８】
【表１】

【００２９】
実施例２；合金番号９（組成Ｐｔ＝８５％、Ｃｒ＝０．５％、Ｔｉ＝０．２％、Ｆｅ＝残部）の合金の製造および評価。
原料として、実施例１の電解鉄、白金および純度約９９．９％のクロムとチタンを用いた。また溶解法は、高周波誘導炉を用いて原料を直接溶解し、実施例１と同様の鋳型に湯を注入した。得られた丸棒に表２に示した各種熱処理および冷間加工を施して磁石特性を測定した。
【００３０】
【表２】

【００３１】
なお、代表的な合金の特性は表３に示す通りであり、いずれも優れた磁石特性を有している。また、希土類元素はＳｃ、Ｙおよびランタン族系元素からなるものであるが、その効果は均等であり、Ｙの場合を表３中に示した。
【００３２】
【表３】

【００３３】
【発明の効果】
本発明合金は、残留磁束密度２，０００ガウス以上および保磁力２００エルステッド以上の値を有する磁石特性の優れた磁石合金で、且つ、貴金属製品と認定されるＰｔ量を含有するため、宝飾用品、医療用具ならびに電気的機械的エネルギーの変換を利用した電磁部品および当該電磁部品を用いた電磁機器等に好適である。[0001]
[Industrial applications]
The present invention provides a jewelry permanent magnet alloy composed of Fe (iron) and Pt (platinum), or a main component thereof, and Co (cobalt), Ni (nickel), Cu (copper), Mn (manganese) as subcomponents. , Pd (palladium), Ag (silver), Au (gold), Cr (chromium), Mo (molybdenum), W (tungsten), Al (aluminum), Si (silicon), Ti (titanium), Zr (zirconium) , Hf (hafnium), V (vanadium), Nb (niobium), Ta (tantalum), In (indium), Ge (germanium), Sn (tin), Re (rhenium), Ru (ruthenium), Os (osmium) , Rh (rhodium), Ir (iridium), rare earth elements, Ca and Ca fluorine compounds, jewelry permanent magnet alloys And relates to medical instruments and electromagnetic devices using their preparation as well as this, it is an object is to obtain a residual magnetic flux density and the coercive force is large jewelery permanent magnet alloy.
[0002]
[Prior art]
Since in the Fe-Pt-based binary alloy, Fe-50 atomic% Pt alloy is high temperature transformation temperature and about 1320 ° C. to gamma phase disordered lattice from gamma ₁ phase of ordered lattice, quenched by water quenching However, regularization progresses, resulting in an overaged state, and a magnet alloy having a large maximum energy product cannot be obtained. Therefore, the composition of the Fe-Pt alloy, go to the transformation temperature is relatively low Fe side, readily as gamma phase disordered lattice is obtained, the rules by adding an aging treatment grating to gamma ₁ by the state of fine gamma ₁ phase to the land of the initial state or in the matrix gamma phase of ordering which is transformed into the phase is uniformly dispersed, large magnet alloy of the maximum energy product is obtained (KOKOKU No. 3-35801).
[0003]
[Problems to be solved by the invention]
The permanent magnet properties of the Fe-Pt-based alloy show the residual magnetic flux density and the residual magnetic flux density in the initial state of ordering in the uniform disordered lattice γ phase or in the state in which the fine ordered lattice γ ₁ phase is uniformly dispersed in the ground of the γ phase. The coercive force increases and shows the highest energy product. Therefore, in order to suppress the formation of ordered lattice gamma ₁ phase in the initial, the quenching process from ordered lattice transformation temperature or more high temperature applied. However, this transformation temperature is in a very high range, which hinders the production of an alloy having high magnet properties with good reproducibility and in large quantities. It is strongly desired to improve this. The alloy containing a noble metal quality certification hallmark 85 wt% or more of Pt obtained in FePt system is in the vicinity of the composition antiferromagnetic intermetallic compound FePt ₃ which does not exhibit magnetic properties is formed, a high magnetic characteristic Is difficult to obtain stably, but improvement in this point is also desired.
[0004]
[Means for Solving the Problems]
An object of the present invention is to improve magnet properties, reproducibility of magnet properties, castability, workability, and the like of an Fe-Pt-based alloy from which a noble metal quality certification polemark can be obtained.
That is, in the present invention, Pt 83 to 87% as a main component and 5% or less of each of Co, Ni, Cu, Mn, Pd, Ag, Au, Cr, Mo, and W as subcomponents, Al, Si , Ti, Zr, Hf, V, Nb, Ta, In, Ge, Sn, Re, Ru, Os, Rh, Ir, and rare earth elements each at 3% or less, and Ca and Ca fluorine compounds at 0.5% or less, respectively. An alloy comprising one or more of 0.0001 to 10% or less in total and the balance of Fe and a small amount of impurities, which is suitable in a vacuum or various gas atmospheres, for example, a gas such as argon, methane, hydrogen, or nitrogen. By using a suitable melting method, such as a high-frequency induction melting method, a current heating furnace method, and an arc melting method, the molten metal is cast into a suitable mold, for example, a mold, a mold made of refractory, etc. It is.
[0005]
In order to improve the magnet properties, it is heated at a temperature of 700 ° C. or higher and the melting point or lower of the superlattice lattice transformation temperature for a suitable time, for example, 1 minute to 500 hours, preferably 5 minutes to 300 hours, to form a solution. After that, an irregular lattice phase is formed by cooling at a rate of 100 ° C./hour or more, preferably 300 ° C./hour or more. Then, immediately or if necessary, after cold working at a working rate of 10% or more, preferably 20% or more, the temperature is 200 ° C or more and 1100 ° C or less, preferably 300 ° C or more and 1000 ° C or less. The mixture is heated at a temperature for an appropriate time, for example, 1 minute to 1000 hours, preferably 5 minutes to 800 hours, and cooled. Alternatively, by heating after casting for 1 minute to 500 hours at a temperature of 700 ° C. to melting point to form an irregular lattice phase, and then cooling at an appropriate rate of 1 ° C./hour to 100 ° C./second. An appropriate regular lattice phase is formed, and a jewelry permanent magnet alloy having a residual magnetic flux density of 2,000 Gauss or more and a coercive force of 200 Oe or more is obtained.
[0006]
Since these permanent magnet alloys have excellent magnet properties and a high platinum content, they can be used as precious metal quality certification pole marks, and thus are suitable for jewelry articles, such as fashion rings (rings), bracelets, necklaces, pendants, and earrings. In addition, the present invention can be applied to general magnetic medical devices, such as sticking magnets, jewelry suction devices, and electromagnetic devices, such as electrocardiograph actuators and electromagnetic probes.
[0007]
The features of the present invention are as follows.
[First invention]
The present invention relates to a jewelry permanent magnet alloy comprising 83 to 87% by weight of Pt, the balance being Fe and a small amount of impurities, and having a residual magnetic flux density of 2,000 Gauss or more and a coercive force of 200 Oe or more.
[0008]
[Second invention]
In weight percent, 83 to 87% of Pt as a main component, 5% or less of each of Co, Ni, Cu, Mn, Pd, Ag, Au, Cr, Mo, and W as subcomponents, Al, Si, Ti, Zr, One or two of Hf, V, Nb, Ta, In, Ge, Sn, Re, Ru, Os, Rh, Ir, and rare earth elements, each of which is 3% or less, and each of Ca and Ca fluorine compounds is 0.5% or less. The present invention relates to a permanent magnet alloy for jewelry, comprising a total of 0.0001 to 10% or less, the balance being Fe and a small amount of impurities, and having a residual magnetic flux density of 2,000 gauss or more and a coercive force of 200 Oe or more.
[0009]
[Third invention]
An alloy consisting of 83 to 87% by weight of Pt and the balance of Fe and a small amount of impurities is heated at a temperature of 700 ° C. or more and a melting point or less for 1 minute or more and 500 hours or less, and then homogenized to 100 ° C./hour or more. Jewelry having a remanence of at least 2,000 gauss and a coercive force of at least 200 Oe by cooling at a speed and then heating at a temperature of 200 ° C. to 1100 ° C. for 1 minute to 1000 hours and then cooling. The present invention relates to a method for producing a permanent magnet alloy.
[0010]
[Fourth invention]
An alloy consisting of 83 to 87% by weight of Pt and the balance of Fe and a small amount of impurities is heated at a temperature of 700 ° C. or more and a melting point or less for 1 minute or more and 500 hours or less, and then homogenized to 100 ° C./hour or more. Cool at a speed, then perform cold working at a working ratio of 10% or more, further heat it at a temperature of 200 ° C. to 1100 ° C. for 1 minute or more and 1000 hours or less, and then cool to obtain a residual magnetic flux density of 2,000 gauss or more. And a method for producing a jewelry permanent magnet alloy having a coercive force of 200 Oe or more.
[0011]
[Fifth invention]
An alloy consisting of 83-87% by weight of Pt and the balance of Fe and a small amount of impurities is homogenized after casting or by heating at a temperature of 700 ° C. or more and a melting point of 1 minute or more and 500 hours or less. The present invention relates to a method for producing a jewelry permanent magnet alloy, characterized by having a residual magnetic flux density of at least 2,000 gauss and a coercive force of at least 200 Oe by cooling at a rate of not less than / h and not more than 100 ° C / sec.
[0012]
[Sixth invention]
In weight percent, 83 to 87% of Pt as a main component, 5% or less of each of Co, Ni, Cu, Mn, Pd, Ag, Au, Cr, Mo, and W as subcomponents, Al, Si, Ti, Zr, One or two of Hf, V, Nb, Ta, In, Ge, Sn, Re, Ru, Os, Rh, Ir, and rare earth elements, each of which is 3% or less, and each of Ca and Ca fluorine compounds is 0.5% or less. The alloy comprising the total of 0.0001 to 10% or less and the balance of Fe and a small amount of impurities is heated at a temperature of 700 ° C. or more and a melting point or less for 1 minute or more and 500 hours or less, and then homogenized, and then 100 ° C./hour or more. And then heated at a temperature of 200 ° C. to 1100 ° C. for 1 minute to 1000 hours and then cooled to obtain a residual magnetic flux density of 2,000 gauss or more and a coercive force of 200 Els A process for producing jewelery permanent magnet alloy characterized by having a higher de.
[0013]
[Seventh invention]
In weight percent, 83 to 87% of Pt as a main component, 5% or less of each of Co, Ni, Cu, Mn, Pd, Ag, Au, Cr, Mo, and W as subcomponents, Al, Si, Ti, Zr, One or two of Hf, V, Nb, Ta, In, Ge, Sn, Re, Ru, Os, Rh, Ir, and rare earth elements, each of which is 3% or less, and each of Ca and Ca fluorine compounds is 0.5% or less. The alloy comprising the total of 0.0001 to 10% or less and the balance of Fe and a small amount of impurities is heated at a temperature of 700 ° C. or more and a melting point or less for 1 minute or more and 500 hours or less, and then homogenized, and then 100 ° C./hour or more. Then, cold working is performed at a working rate of 10% or more, and this is further heated at a temperature of 200 ° C. to 1100 ° C. for 1 minute to 1000 hours, and then cooled to obtain a residual magnetic flux density. , 000 Gauss or more and a process for producing jewelery permanent magnet alloy characterized by having a coercive force 200 Oe or more.
[0014]
[Eighth invention]
In weight percent, 83 to 87% of Pt as a main component, 5% or less of each of Co, Ni, Cu, Mn, Pd, Ag, Au, Cr, Mo, and W as subcomponents, Al, Si, Ti, Zr, One or two of Hf, V, Nb, Ta, In, Ge, Sn, Re, Ru, Os, Rh, Ir, and rare earth elements, each of which is 3% or less, and each of Ca and Ca fluorine compounds is 0.5% or less. The alloy comprising the total of 0.0001 to 10% or less and the balance of Fe and a small amount of impurities is heated at a temperature of 700 ° C or more and a melting point or less for 1 minute or more and 500 hours or less, and then homogenized, and then 1 ° C / hour or more. The present invention relates to a method for producing a jewelry permanent magnet alloy characterized by having a residual magnetic flux density of at least 2,000 gauss and a coercive force of at least 200 Oersted by cooling at a rate of 100 ° C./sec or less. That.
[0015]
[Ninth invention]
Medical use comprising a permanent magnet alloy for jewelry, characterized by having a Pt of 83 to 87%, a balance of Fe and a small amount of impurities, and having a residual magnetic flux density of 2,000 gauss or more and a coercive force of 200 Oe or more. Equipment related.
[0016]
[Tenth invention]
In weight percent, 83 to 87% of Pt as a main component, 5% or less of each of Co, Ni, Cu, Mn, Pd, Ag, Au, Cr, Mo, and W as subcomponents, Al, Si, Ti, Zr, Hf, V, Nb, Ta, In, Ge, Sn, Re, Ru, Os, Rh, Ir, 3% or less of each of rare earth elements, and Ca and a fluorine compound of 0.5% or less of each of fluorine compounds of Ca or 2 or more. A total of at least 0.0001 to 10% of the species, the balance being Fe and a small amount of impurities, and having a residual magnetic flux density of at least 2,000 gauss and a coercive force of at least 200 Oe, and comprising a jewelry permanent magnet alloy. It relates to medical equipment.
[0017]
[Eleventh invention]
An electromagnetic device comprising a permanent magnet alloy for jewelry, comprising 83 to 87% by weight of Pt, the balance being Fe and a small amount of impurities, having a residual magnetic flux density of 2,000 Gauss or more and a coercive force of 200 Oe or more. About.
[0018]
[Twelfth invention]
In weight percent, 83 to 87% of Pt as a main component, 5% or less of each of Co, Ni, Cu, Mn, Pd, Ag, Au, Cr, Mo, and W as subcomponents, Al, Si, Ti, Zr, One or two of Hf, V, Nb, Ta, In, Ge, Sn, Re, Ru, Os, Rh, Ir, and rare earth elements, each of which is 3% or less, and each of Ca and Ca fluorine compounds is 0.5% or less. A total of 0.0001 to 10% or less, the balance being Fe and a small amount of impurities, and having a residual magnetic flux density of 2,000 gauss or more and a coercive force of 200 oersted or more, an electromagnet made of a jewelry permanent magnet alloy. Equipment related.
[0019]
Next, the reason why the composition of the alloy of the present invention is limited to the above range is that the content of platinum is large, so that the noble metal quality certification pole can be obtained, and in this composition range, the residual magnetic flux density is 2,000 gauss or more. This is because the coercive force is 200 Oe or more and the magnet properties are excellent, but if the composition is out of this range, the magnet properties are deteriorated.
The alloy of the present invention combines the composition of a noble metal alloy and the properties of a permanent magnet by shifting the composition of an Fe—Pt alloy having an equivalent atomic ratio to the Pt side. Pt although desired magnetic properties present face-centered tetragonal gamma _1-phase ordered lattice in the range of 83-87% is obtained, when the Pt content exceeds 87%, between the anti-ferromagnetic metal adjacent compound FePt ₃ characteristics by no longer ferromagnetic can be obtained and, since the amount of Pt can not receive the noble quality certification hallmark is an alloy of less than 83%, with limited Pt to 83 to 87%. Furthermore, each of Co, Ni, Cu, Mn, Pd, Ag, Au, Cr, Mo, and W as an auxiliary component is 5% or less, and Al, Si, Ti, Zr, Hf, V, Nb, Ta, In, Ge, When Sn, Re, Ru, Os, Rh, Ir, and rare earth elements are added in an amount of 3% or less, respectively, and Ca and a Ca fluorine compound are each 0.5% or less, or a total of 0.0001 to 10% of a total of two or more kinds is added. As a result, the residual magnetic flux density is increased, the coercive force is increased, or the squareness of the magnetic hysteresis curve is improved, and a magnet alloy having a relatively large maximum energy product can be obtained.
[0020]
Next, the reason for limiting the homogenization processing conditions in the present invention will be described. The superlattice transformation point of the alloy having the composition of the present invention varies depending on the composition and is 700 to 1100 ° C, and the melting point is about 1600 ° C. For this reason, if the homogenization treatment temperature is not higher than 700 ° C., the ordered lattice γ ₁ phase is mixed, and the disordered lattice γ single phase cannot be obtained. If the homogenization treatment time is less than 1 minute, the treatment effect cannot be obtained. If the treatment time is long, it is not economically preferable, and the oxidation progress which causes the deterioration of the magnet characteristics is remarkably increased. Limited to. It is desirable that the cooling rate after the homogenization treatment is high. However, if the cooling rate is less than 100 ° C./hour, the crystal grains composed of the finely dispersed and precipitated ordered lattice γ ₁ phase become coarse and cause deterioration of the magnet characteristics. It was limited to 100 ° C./hour or more.
[0021]
Next, the reason for limiting the aging treatment conditions for exhibiting magnet properties after rapid cooling will be described. If the aging treatment temperature is lower than 200 ° C., the aging time requires 2000 hours or more, which is not only economically unfavorable, but also results in no treatment effect and no improvement in magnet properties can be expected. On the other hand, if the temperature exceeds 1100 ° C., the ordering does not proceed, and magnet properties cannot be obtained. Therefore, the aging temperature is limited to 200 to 1100 ° C. The preferred range is 300 to 800 ° C. If the aging time including the heating / cooling process is less than 1 minute, magnet characteristics cannot be obtained even at an aging temperature of 1100 ° C. Is significantly deteriorated, so that the aging treatment time is limited to 1 minute or more and 1000 hours or less. Since the cooling rate after the aging treatment does not affect the magnet properties, either rapid cooling or slow cooling can be adopted, but rapid cooling is desirable.
[0022]
Next, prior to the aging treatment, when processing such as drawing or rolling is performed, if the processing rate is less than 10%, the internal strain remains only in the surface layer, which is insufficient for improving the magnet properties. The processing rate was limited to 10% or more.
[0023]
[Action]
Compositionally referred to in the present invention, also the gamma ₁ phase which is incomplete by the heat treatment, Fe in atomic ratio was Fe-Pt2 binary alloy: Pt = 50: 50 the place to become a completely ordered lattice in the case of In the present invention, the γ ₁ phase is made into an imperfect ordered lattice by shifting the composition to the Pt side, and the γ ₁ phase is transformed into the γ ₁ phase of the ordered lattice by quenching or reheating after quenching. the initial state is formed to, those that become incomplete gamma ₁ phase. In this state, since the coercive force and the squareness of the magnetic hysteresis curve are large and the residual magnetic flux density is also high, the maximum energy product is large, and the residual magnetic flux density of 2,000 gauss or more and the coercive force of 200 Oe As described above, a jewelry permanent magnet alloy can be obtained with good reproducibility.
[0024]
Next, the present invention will be described in detail in the order of steps.
(1) In order to produce the alloy of the present invention, a metal weighed to a desired composition is melted using a suitable melting furnace, and then sufficiently stirred to produce a compositionally homogeneous molten alloy, which is formed into an appropriate shape. It is put into a mold to form an ingot, or forged, drawn, and rolled into a predetermined shape. This is heated to a temperature of 700 ° C. or higher and a melting point or lower and heated for 1 minute to 500 hours, homogenized, and then rapidly cooled at a cooling rate of 100 ° C./hour or higher. In this process, the alloy which has been heated to a temperature higher than the transformation point of the ordered lattice and quenched into the disordered lattice-phased alloy is turned into a face-centered cubic γ-phase unit having an irregular lattice, and the state is obtained at room temperature and fixed. It is a process to be.
[0025]
(2) When reheating at a temperature of 200 to 1100 ° C. for at least 1 minute to 1000 hours after the quenching of (1), the initial phase in which the γ phase solid solution of the disordered lattice generated at a high temperature is transformed into the γ ₁ phase of the ordered lattice In this state, local strain is generated, and movement of the domain wall is prevented, so that a magnet alloy having a large coercive force and a residual magnetic flux density can be obtained.
This step is performed in an initial state in which quenching transforms the face-centered cubic γ phase of disordered lattice into a face-centered tetragonal γ ₁ phase of disordered lattice, or in the state of disordered lattice γ phase _This is a process in which a state in which _one- phase fine crystals are uniformly dispersed is obtained at room temperature to fix it.
[0026]
(3) After the rapid cooling of (1), cold working such as drawing or rolling at a working rate of 10% or more is performed.
(4) After the cold working of (3), the tempering treatment of (2) is added. This step is the internal strain caused in the step (3), to generate a texture suitable local strain and crystal hitting the change of gamma _1-phase, promotes improvement of squareness in result the magnetic hysteresis curve, Excellent magnet properties can be obtained. Of course, even if the processing rate is 10% or less, the effect is recognized, though not sufficiently.
Depending on the alloy composition, after casting or heating at a temperature of 700 ° C. or more and a melting point or less for 1 minute or more and 500 hours or less, a homogenization treatment is performed to form a γ-phase solid solution having an irregular lattice. / 100 ° C. / sec when cooled below the proper speed or time, by gamma _1-phase an appropriate amount of ordered lattice in the matrix phase of the gamma phase solid solution during cooling is transformed, the residual magnetic flux density of 2,000 Gauss As described above, the magnet characteristics having a coercive force of 200 Oe or more can be obtained.
[0027]
【Example】
Next, embodiments of the present invention will be described.
Example 1: Production and evaluation of an alloy of Sample No. 2 (composition Pt = 84%, Pd = 2.0%, Fe = remainder).
As raw materials, 99.99% pure electrolytic iron, 99.9% pure platinum and palladium were used. A raw material having a total weight of 30 g was melted by an arc melting method in argon gas to prepare a button-shaped casting base material, which was put into an alumina crucible and melted in a vacuum using a high-frequency induction melting furnace. It was poured into a mold having a 5 mm cylindrical hole. A length of 30 mm was cut out from the obtained round bar, subjected to heat treatment and cold working as shown in Table 1, and the magnet properties were measured.
[0028]
[Table 1]

[0029]
Example 2: Production and evaluation of alloy No. 9 (composition Pt = 85%, Cr = 0.5%, Ti = 0.2%, Fe = remaining).
As raw materials, the electrolytic iron, platinum of Example 1, and chromium and titanium having a purity of about 99.9% were used. In the melting method, raw materials were directly melted using a high-frequency induction furnace, and hot water was poured into the same mold as in Example 1. The obtained round bar was subjected to various heat treatments and cold working shown in Table 2 to measure magnet properties.
[0030]
[Table 2]

[0031]
The properties of typical alloys are as shown in Table 3, and all have excellent magnet properties. The rare earth element is composed of Sc, Y and a lanthanum group element, and the effect is the same. The case of Y is shown in Table 3.
[0032]
[Table 3]

[0033]
【The invention's effect】
The alloy of the present invention is a magnet alloy having excellent magnetic properties having a residual magnetic flux density of 2,000 gauss or more and a coercive force of 200 oersted or more, and containing a Pt amount recognized as a noble metal product, jewelry articles, The present invention is suitable for medical devices, electromagnetic components utilizing conversion of electrical and mechanical energy, electromagnetic devices using the electromagnetic components, and the like.

Claims

A jewelry permanent magnet alloy comprising 83-87% by weight of Pt, the balance being Fe and a small amount of impurities, having a residual magnetic flux density of 2,000 gauss or more and a coercive force of 200 oersteds or more.

In weight percent, 83 to 87% of Pt as a main component, 5% or less of each of Co, Ni, Cu, Mn, Pd, Ag, Au, Cr, Mo, and W as subcomponents, Al, Si, Ti, Zr, One or two of Hf, V, Nb, Ta, In, Ge, Sn, Re, Ru, Os, Rh, Ir, and rare earth elements, each of which is 3% or less, and each of Ca and Ca fluorine compounds is 0.5% or less. A permanent magnet alloy for jewelry comprising a total of 0.0001 to 10% or less, a balance of Fe and a small amount of impurities, and has a residual magnetic flux density of 2,000 gauss or more and a coercive force of 200 oersted or more.

An alloy consisting of 83 to 87% by weight of Pt and the balance of Fe and a small amount of impurities is heated at a temperature of 700 ° C. or more and a melting point or less for 1 minute or more and 500 hours or less, and then homogenized to 100 ° C./hour or more. Jewelry characterized by having a residual magnetic flux density of at least 2,000 gauss and a coercive force of at least 200 Oe by cooling at a speed and then heating at a temperature of 200 ° C. to 1100 ° C. for 1 minute to 1000 hours and then cooling. Manufacturing method of permanent magnet alloy.

An alloy consisting of 83 to 87% by weight of Pt and the balance of Fe and a small amount of impurities is heated at a temperature of 700 ° C. or more and a melting point or less for 1 minute or more and 500 hours or less, and then homogenized to 100 ° C./hour or more. Cool at a speed, then perform cold working at a working ratio of 10% or more, further heat it at a temperature of 200 ° C. to 1100 ° C. for 1 minute or more and 1000 hours or less, and then cool to obtain a residual magnetic flux density of 2,000 gauss or more. And a method for producing a jewelry permanent magnet alloy having a coercive force of 200 Oe or more.

An alloy consisting of 83 to 87% by weight of Pt and the balance of Fe and a small amount of impurities is subjected to homogenization treatment after casting or by heating at a temperature of 700 ° C. or more and a melting point of 1 minute or more and 500 hours or less. A method for producing a jewelry permanent magnet alloy, characterized by having a residual magnetic flux density of not less than 2,000 gauss and a coercive force of not less than 200 Oe by cooling at a rate of not less than / h and not more than 100 ° C / sec.

In weight percent, 83 to 87% of Pt as a main component, 5% or less of each of Co, Ni, Cu, Mn, Pd, Ag, Au, Cr, Mo, and W as subcomponents, Al, Si, Ti, Zr, One or two of Hf, V, Nb, Ta, In, Ge, Sn, Re, Ru, Os, Rh, Ir, and rare earth elements, each of which is 3% or less, and each of Ca and Ca fluorine compounds is 0.5% or less. The alloy comprising the total of 0.0001 to 10% or less and the balance of Fe and a small amount of impurities is heated at a temperature of 700 ° C. or more and a melting point or less for 1 minute or more and 500 hours or less, and then homogenized, and then 100 ° C./hour or more. At a temperature of 200 ° C. to 1100 ° C. for 1 minute or more and 1000 hours or less, followed by cooling to obtain a residual magnetic flux density of 2,000 gauss or more and a coercive force of 200 Elst. Preparation of jewelery permanent magnet alloy characterized by having a higher de.

In weight percent, 83 to 87% of Pt as a main component, 5% or less of each of Co, Ni, Cu, Mn, Pd, Ag, Au, Cr, Mo, and W as subcomponents, Al, Si, Ti, Zr, One or two of Hf, V, Nb, Ta, In, Ge, Sn, Re, Ru, Os, Rh, Ir, and rare earth elements, each of which is 3% or less, and each of Ca and Ca fluorine compounds is 0.5% or less. The alloy comprising the total of 0.0001 to 10% or less and the balance of Fe and a small amount of impurities is heated at a temperature of 700 ° C. or more and a melting point or less for 1 minute or more and 500 hours or less, and then homogenized, and then 100 ° C./hour or more. Then, cold working is performed at a working rate of 10% or more, and this is further heated at a temperature of 200 ° C. to 1100 ° C. for 1 minute to 1000 hours, and then cooled to obtain a residual magnetic flux density. The process of jewelery permanent magnet alloy characterized by having more than 000 gauss to and coercivity 200 oersteds.

In weight percent, 83 to 87% of Pt as a main component, 5% or less of each of Co, Ni, Cu, Mn, Pd, Ag, Au, Cr, Mo, and W as subcomponents, Al, Si, Ti, Zr, One or two of Hf, V, Nb, Ta, In, Ge, Sn, Re, Ru, Os, Rh, Ir, and rare earth elements, each of which is 3% or less, and each of Ca and Ca fluorine compounds is 0.5% or less. After casting, or after heating the alloy consisting of 0.0001 to 10% or less and the balance of Fe and a small amount of impurities at a temperature of 700 ° C. or more and a melting point or less for 1 minute or more and 500 hours or less, a homogeneous solution treatment is performed, A permanent magnet for jewelry characterized by having a residual magnetic flux density of at least 2,000 gauss and a coercive force of at least 200 Oe by cooling at a rate of 1 ° C./hour to 100 ° C./second. The process of the alloy.

Medical use comprising a permanent magnet alloy for jewelry, characterized by having a Pt of 83 to 87%, a balance of Fe and a small amount of impurities, and having a residual magnetic flux density of 2,000 gauss or more and a coercive force of 200 Oe or more. Appliances.

In weight percent, 83 to 87% of Pt as a main component, 5% or less of each of Co, Ni, Cu, Mn, Pd, Ag, Au, Cr, Mo, and W as subcomponents, Al, Si, Ti, Zr, Hf, V, Nb, Ta, In, Ge, Sn, Re, Ru, Os, Rh, Ir, 3% or less of each of rare earth elements, and Ca and a fluorine compound of 0.5% or less of each of fluorine compounds of Ca or 2 or more. A total of at least 0.0001 to 10% of the species, the balance being Fe and a small amount of impurities, and having a residual magnetic flux density of at least 2,000 gauss and a coercive force of at least 200 Oe, and comprising a jewelry permanent magnet alloy. Medical instruments.

An electromagnetic device comprising a permanent magnet alloy for jewelry, comprising 83 to 87% by weight of Pt, the balance being Fe and a small amount of impurities, having a residual magnetic flux density of 2,000 Gauss or more and a coercive force of 200 Oe or more. .

In weight percent, 83 to 87% of Pt as a main component, 5% or less of each of Co, Ni, Cu, Mn, Pd, Ag, Au, Cr, Mo, and W as subcomponents, Al, Si, Ti, Zr, One or two of Hf, V, Nb, Ta, In, Ge, Sn, Re, Ru, Os, Rh, Ir, and rare earth elements, each of which is 3% or less, and each of Ca and Ca fluorine compounds is 0.5% or less. A total of 0.0001 to 10% or less, the balance being Fe and a small amount of impurities, and having a residual magnetic flux density of 2,000 gauss or more and a coercive force of 200 oersted or more, an electromagnet made of a jewelry permanent magnet alloy. machine.