JP2022001667A - 合金組成物、Fe基ナノ結晶合金及びその製造方法、並びに磁性部品 - Google Patents
合金組成物、Fe基ナノ結晶合金及びその製造方法、並びに磁性部品 Download PDFInfo
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Abstract
Description
また、本発明に係る他の合金組成物は、組成式がFeaVαBbPxCyCuzであり、79≦a≦91at%、5≦b≦13at%、1≦x≦8at%、0≦y≦5at%、0.4≦z≦1.4at%、0<α<5at%、及び、0.08≦z/x≦0.8である。
まず、本発明の実施の形態の合金組成物を作製した。表1〜4に示す実施例1〜3,7,8及び参考例4〜6の合金組成となるように原料を秤量し、高周波溶解により溶解した。溶解した原料を用いて、大気雰囲気中での単ロール液体急冷法により、厚さ20μm、幅10mmに調整した連続薄帯を作製し、これらを本発明の実施の形態の合金組成物とした。また、比較例として、同様の製造方法により、表1〜4の比較例1〜3の組成を有する連続薄帯の合金組成物を作製した。なお、非特許文献1に記載の(Fe85.7Si0.5B9.5P3.5Cu0.8)99C1の合金組成物を、比較例1としている。
次に、本発明の実施の形態のFe基ナノ結晶合金を作製した。実施例1〜3,7,8、参考例4〜6及び比較例1〜3の連続薄帯の合金組成物から、長さ50mmの断片を切出し、それぞれ10枚重ねてアルミ箔で包んだ。それらを、赤外線ランプ加熱炉を用いて、Arガスフロー中で熱処理して、実施例1〜3,7,8、参考例4〜6及び比較例1〜3のFe基ナノ結晶合金を作製した。熱処理条件は、種々の昇温速度(Heating rate;Rh)、及び、種々の到達温度(Annealing temperature;Ta)で行い、設定された到達温度での等温保持時間を10分間とした。
表1に示す実施例1〜3及び比較例1のFe基ナノ結晶合金における保磁力(Coercivity)の熱処理昇温速度(Heating rate)依存性を、図2(a)及び図2(b)に示す。図2(a)及び図2(b)は、それぞれ到達温度Ta(annealing temperature)が420℃及び430℃のものであり、これらが最適熱処理温度である。
表1に示す実施例1〜3及び比較例1のFe基ナノ結晶合金における保磁力(Coercivity)の熱処理到達温度(Annealing temperature)依存性を、図7(a)及び図7(b)に示す。図7(a)に示すように、昇温速度Rhが300℃/minのとき、380℃〜440℃の温度範囲において、Vを0.1at%以上含む実施例1〜3の方が、Vを含まない比較例1と比べて、概ね保磁力が低いことが確認された。また、Vを含まない比較例1は、440℃を超えると保磁力が10A/mを超えて、急速に劣化するのに対し、Vを0.1at%以上含む実施例1〜3では、440℃でも保磁力は10A/m未満であることが確認された。高い磁束密度は高い到達温度域で得られるため、Vを添加することにより、軟磁気特性の劣化を防ぎつつ、高い到達温度で高い磁束密度を得ることができる。
昇温中、短冊形状の材料は均一に加熱されるが、巻磁心形状の材料は、材料表面では温度追従が容易であるが、材料内部では温度上昇が遅れてしまう。この傾向は、高速昇温で顕著になる。さらに、到達温度では、結晶化発熱が瞬時に起こり、巻磁心そのものの温度は急上昇する。その熱量は材料の重量に比例するため、温度上昇は磁心重量が大きいほど大きい。また、昇温速度が大きいほど結晶化発熱がより短時間に起こるため、温度上昇は大きくなる。
また、本発明に係る他の合金組成物は、組成式がFeaVαBbPxCyCuzであり、79≦a≦91at%、5≦b≦13at%、1≦x≦8at%、0≦y≦5at%、0.4≦z≦1.4at%、0<α<5at%、及び、0.08≦z/x≦0.8である。
Claims (9)
- 組成式がFeaVαBbSicPxCyCuzであり、79≦a≦91at%、5≦b≦13at%、0≦c≦8at%、1≦x≦8at%、0<y≦5at%、0.4≦z≦1.4at%、0<α<5at%、及び、0.08≦z/x≦0.8である合金組成物。
- 組成式がFeaVαBbPxCyCuzであり、79≦a≦91at%、5≦b≦13at%、1≦x≦8at%、0≦y≦5at%、0.4≦z≦1.4at%、0<α<5at%、及び、0.08≦z/x≦0.8である合金組成物。
- Feの3at%以下が、Ti、Zr、Hf、Nb、Ta、Mo、W、Cr、Co、Ni、Al、Mn、Ag、Zn、Sn、As、Sb、Bi、Y、N、O、Ca、Mg、及び、希土類元素のうち、1種類以上の元素で置換されている請求項1又は2に記載の合金組成物。
- 連続薄帯形状又は粉末形状である請求項1〜3のいずれか1項に記載の合金組成物。
- 熱処理したとき、最初にαFe相が析出する第1結晶化開始温度(Tx1)と、前記第1結晶化開始温度よりも高温でFeとB、P又はSiとの化合物が析出する第2結晶化開始温度(Tx2)との温度差ΔT(=Tx2−Tx1)が100〜200℃である請求項1〜4のいずれか1項に記載の合金組成物。
- 請求項1〜5のいずれか1項に記載の合金組成物を熱処理して得られ、保持力が20A/m以下であるFe基ナノ結晶合金。
- 結晶粒の平均粒径が5〜25nmである請求項6に記載のFe基ナノ結晶合金。
- 請求項6又は7に記載のFe基ナノ結晶合金を用いて構成された磁性部品。
- 組成式がFeaVαBbSicPxCyCuzであり、79≦a≦91at%、5≦b≦13at%、0≦c≦8at%、1≦x≦8at%、0<y≦5at%、0.4≦z≦1.4at%、0<α<5at%、及び、0.08≦z/x≦0.8である合金組成物、又は、組成式がFeaVαBbPxCyCuzであり、79≦a≦91at%、5≦b≦13at%、1≦x≦8at%、0≦y≦5at%、0.4≦z≦1.4at%、0<α<5at%、及び、0.08≦z/x≦0.8である合金組成物を、100℃〜300℃/minの昇温速度で加熱し、且つ、結晶化開始温度以上の温度で結晶化熱処理する工程を有するFe基ナノ結晶合金の製造方法。
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JP2012012699A (ja) * | 2010-03-23 | 2012-01-19 | Nec Tokin Corp | 合金組成物、Fe基ナノ結晶合金及びその製造方法、並びに磁性部品 |
CN105448448A (zh) * | 2014-08-21 | 2016-03-30 | 中国科学院宁波材料技术与工程研究所 | 一种铁基纳米晶软磁合金及其制备方法 |
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JP2020020023A (ja) | 2020-02-06 |
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