JP6163258B2 - 希土類永久磁石粉末、それを含む接着性磁性体及び当該接着性磁性体を応用した素子 - Google Patents
希土類永久磁石粉末、それを含む接着性磁性体及び当該接着性磁性体を応用した素子 Download PDFInfo
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Description
希土類合金磁石粉末の成分は、溶融したサマリウム鉄シリーズの合金粉末を窒化することで形成され、成分は窒化後の磁石粉末の成分であって、成分を原子%で表する。
平均結晶粒子サイズの表示方法:電子顕微鏡で材料のミクロ組織写真を撮って、写真から硬磁性相であるTbCu7構造の結晶粒子と軟磁性相であるα−Fe相の結晶粒子を観察し、具体的な方法は、n個の同種類の結晶粒子の総断面面積Sを統計し、その後、断面面積Sと同面積の円を求めると、その円の直径を平均結晶粒子サイズσとし、単位はnmで、計算式は、
結晶粒子の分布は標準偏差で示し、対応する計算式は、
本発明において、統計の正確性及びテスト状況に鑑み、nは50以上の値を取る。
磁石粉末の性能は、試料振動型磁力計(VSM検出)で検出する。
ここで、Brは残留磁気で、単位はkGsである。
Hcjは固有の保磁力であって、単位はkOeである。
(BH)mは磁気エネルギー積で、単位はMGOeである。
相の比例は、磁性材料の金相写真の面積を分析して得られ、断面面積比を測定することによって、体積比を得る。
得られた合金粉末をXRDで測定し、Cu標的を標的材とし、得られた磁石粉末の相構造を観察した。
以下の実施例1〜38にて製造される希土類永久磁石粉末にXRDピーク検出を行った結果、回折図形中の2θ角が65°〜75°間であるピーク強度と最も強いピーク強度との比が10%を超える回折ピークの数量はいずれも1個又は0個である。
厚みは、ノギスで測定し、厚みの単位はμmである。
(1)比例に応じて、表1の各実施例に記載の金属を混合してから誘導溶解炉に投入し、Arガスの保護下、精錬して合金鋳塊を得る。
(2)合金鋳塊を荒い粒状にしてから急冷炉に投入して急冷を行い、保護ガスはArガスであって、噴射圧力は80kPaで、ノズルの直径は0.8mmで、水冷却ローラーの線速度は55m/sで、急冷後にシート状の合金粉末を得る。
(3)上記合金粉末をArガスの保護下、750℃で、55min処理してから、大気圧のN2ガスで窒化を行い、その処理条件は、460℃、7時間であって、窒化物である磁石粉末を得る。
(1)比例に応じて、表3の各実施例に記載の金属を混合してから誘導溶解炉に投入し、Arガスの保護下、精錬して合金鋳塊を得る。
(2)合金鋳塊を荒い粒状にした後急冷炉に投入して急冷を行い、保護ガスはArガスで、噴射圧力は80kPaで、ノズルの直径は0.8で、水冷却ローラーの線速度は55m/sで、急冷後にシート状の合金粉末を得る。
(3)上記合金粉末をArガスの保護下、750℃で、55min処理した後、大気圧のN2ガスで窒化を行い、その処理条件は460℃、7時間で、窒化物である磁石粉末を得る。
(1)表5の各実施例のSmFe合金を一定の比例に従って混合してから誘導溶解炉に投入し、Arガスの保護下、精錬して合金鋳塊を得る。
(2)合金鋳塊を荒い粒状にした後急冷炉に投入して急冷を行い、保護ガスはArガスで、噴射圧力は100kPaで、ノズルの直径は0.8mmで、水冷却ローラーの線速度は55m/sで、急冷後にシート状の合金粉末を得る。
(3)上記合金粉末をArガスの保護下、730℃で、60min処理して後、大気圧のN2ガスで窒化を行い、その処理条件は440℃、8時間であって、窒化物である磁石粉末を得る。
(1)表7の各実施例に記載の関連する希土類及び遷移族金属を一定の比例で混合してから誘導溶解炉に投入し、Arガスの保護下、精錬して合金鋳塊を得る。
(2)合金鋳塊を荒い粒状にした後急冷炉に投入して急冷を行い、保護ガスはArガスで、噴射圧力は80kPaで、ノズルの直径は0.7mmで、水冷却ローラーの線速度は55m/sで、銅ローラーの直径は300mmで、急冷後にシート状の合金粉末を得る。
(3)上記合金粉末をArガスの保護下、700℃で、70min処理した後、大気圧のN2ガスで窒化を行い、その処理条件は450℃、6時間であって、窒化物である磁石粉末を得る。
(1)比例に応じて、高純度の金属を混合してから誘導溶解炉に投入し、Arガスの保護下、精錬して合金鋳塊を得る。
(2)合金鋳塊を荒い粒状にした後急冷炉に投入して急冷を行い、保護ガスはArガスで、噴射圧力は80kPaで、ノズルの直径は0.8mmで、水冷却ローラーの線速度は50m/sで、銅ローラーの直径は300mmで、急冷後にシート状の合金粉末を得る。
(3)上記合金粉末をArガスの保護下、710℃で、70min処理した後、磁石粉末を100μm以下の粒状にし、粉砕された粉末と炭素粉末とを混合して480℃で、7時間処理して炭化物である磁石粉末を得る。
(1)表11の各実施例の比例に従って、高純度の金属を混合してから誘導溶解炉に投入し、Arガスの保護下、精錬して合金鋳塊を得る。
(2)合金鋳塊を荒い粒状にした後急冷炉に投入して急冷を行い、保護ガスはArガスで、ノズルの噴射圧力を80kPaに制御し、ノズルの直径は0.8mmで、回転するローラーに噴射して第1回の冷却を行い、さらに、プレートを設けて第2回の冷却を経て、シート状の合金粉末を得る。(ローラーの材質、回転速度、第1回の冷却の温度と第2回の冷却温度は表11に示す通りである。)
(3)上記合金粉末をArガスの保護下、シート状の合金粉末を昇温し、上昇させた後、その温度を保持して熱処理を行う(温度上昇速度、上昇後の温度、熱処理時間は表11に示す通りである)。磁石粉末を100μm以下の粒状にし、粉砕された粉末をN2雰囲気で処理して炭素―窒素化合物である磁石粉末(窒化温度、窒化時間は表11に示す通りである)。
温度上昇速度の単位は℃/sで、冷却速度の単位は℃/sで、急冷ローラーの速度の単位はm/sで、結晶化温度と窒化温度の単位は℃で、結晶化時間の単位は分minで、窒化時間の単位は時間hである。
Claims (12)
- TbCu7構造を有し、且つ結晶粒子サイズが5〜100nmである硬磁性相70〜99vol%と、bcc構造を有するFe相であって、結晶粒子平均サイズが1〜30nmでサイズの標準偏差が0.5σ未満である軟磁性相1〜30vol%とを含むことを特徴とする希土類永久磁石粉末。
- 前記硬磁性相の結晶粒子サイズ分布は5〜80nmの範囲内で、好ましくは、前記硬磁性相の結晶粒子サイズ分布が5〜50nm範囲内であることを特徴とする請求項1に記載の希土類永久磁石粉末。
- 前記軟磁性相が総体積の3〜30vol%を占め、好ましくは、前記軟磁性相が総体積の5〜15vol%を占めることを特徴とする請求項1又は2に記載の希土類永久磁石粉末。
- 前記軟磁性相の平均結晶粒子サイズが1〜20nmであることを特徴とする請求項1乃至3のいずれか一項に記載の希土類永久磁石粉末。
- 前記軟磁性相の結晶粒子サイズの標準偏差が0.3σ以下であることを特徴とする請求項1乃至4のいずれか一項に記載の希土類永久磁石粉末。
- 前記希土類永久磁石粉末がR−T−M−Aからなり、但し、RはSm又はSmと他の希土類元素との組合せで、TはFe又はFeとCoとの組合せで、MはTi、V、Cr、Zr、Nb、Mo、Ta、W、Si又はHfの中の少なくとも一つで、AはN及び/又はCであって、好ましくは、Rの含有量が5〜12at.%で、Aは10〜20at.%で、Mは0〜10at.%であって、残りがTであることを特徴とする請求項1乃至5のいずれか一項に記載の希土類永久磁石粉末。
- Rの含有量が5〜10at.%であることを特徴とする請求項6に記載の希土類永久磁石粉末。
- Rの中のSmの原子数含有量が80〜100at.%であることを特徴とする請求項7に記載の希土類永久磁石粉末。
- 前記TはFeとCoとの組合せで、且つ、前記Tの中のCoの原子数含有量が0〜30at.%であることを特徴とする請求項6に記載の希土類永久磁石粉末。
- 前記希土類永久磁石粉末の厚みが5〜50μmであることを特徴とする請求項1乃至9のいずれか一項に記載の希土類永久磁石粉末。
- 請求項1乃至10のいずれか一項に記載の希土類永久磁石粉末と接着剤とを接着してなることを特徴とする接着性磁性体。
- 請求項11に記載の接着性磁性体を応用したことを特徴とする素子。
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