JP6810512B2 - 温熱治療用の発熱軟磁性粉体、発熱複合体及び発熱シート、これらの製造方法 - Google Patents
温熱治療用の発熱軟磁性粉体、発熱複合体及び発熱シート、これらの製造方法 Download PDFInfo
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- JP6810512B2 JP6810512B2 JP2015162653A JP2015162653A JP6810512B2 JP 6810512 B2 JP6810512 B2 JP 6810512B2 JP 2015162653 A JP2015162653 A JP 2015162653A JP 2015162653 A JP2015162653 A JP 2015162653A JP 6810512 B2 JP6810512 B2 JP 6810512B2
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Description
ILP[H・m2/kg]=SLP[W/kg]/周波数[Hz]/(磁場の強さ[A/m])2 …(式1)
ILPは、後述するように、印加した交流磁場に依存せず、発熱軟磁性粉体の材料及び形状に由来する本来の発熱指標となり得る。
次に、上記したような発熱軟磁性粉体を製作して、ILPを測定した試験結果について、図1乃至3を用いて説明する。
Claims (10)
- 数十kHz程度の低い周波数の外部交流磁場の印加によって発熱する1〜20μmの粒径の温熱治療用発熱軟磁性粉体の製造方法であって、
純鉄、Fe−Si−Al系合金又はFe−Si−Cr系合金のいずれか1つの合金からなり、単位重量[kg]あたりの発熱仕事量[W]を印加磁場の周波数[Hz]及び磁場の強さ[A/m]の2乗で除した指標(ILP)が前記印加磁場に依存しないように、前記合金の成分組成を調整し急冷凝固させた粉体を扁平形状に加工する各製造条件の選択にあたって、前記周波数と前記強さとの組み合わせを(500kHz,4kA/m)及び(30kHz,8kA/m)としたときに、ともに0.50×10−9[H・m2/kg]以上となるように前記選択をすることを特徴とする温熱治療用発熱軟磁性粉体の製造方法。 - 前記合金は、純鉄、Fe−9.5Si−5.5Al合金又はFe−1Si−13Cr合金のいずれか1つからなることを特徴とする請求項1記載の温熱治療用発熱軟磁性粉体の製造方法。
- 前記扁平形状のアスペクト比が2〜50であることを特徴とする請求項2に記載の温熱治療用発熱軟磁性粉体の製造方法。
- 外部交流磁場の印加によって発熱する温熱治療用発熱複合体の製造方法であって、請求項1乃至3のうちの1つに記載の方法で得た温熱治療用発熱軟磁性粉体をマトリクス材料に混合し分散させたことを特徴とする温熱治療用発熱複合体の製造方法。
- 外部交流磁場の印加によって発熱する温熱治療用発熱シートの製造方法であって、請求項1乃至3のうちの1つに記載の方法で得た温熱治療用発熱軟磁性粉体をシート状のマトリクス材料に混合し配向分散させたことを特徴とする温熱治療用発熱シートの製造方法。
- 数十kHz程度の低い周波数の外部交流磁場の印加によって発熱する1〜20μmの粒径の温熱治療用発熱軟磁性粉体であって、
純鉄、Fe−Si−Al系合金又はFe−Si−Cr系合金のいずれか1つの合金からなり、
単位重量[kg]あたりの発熱仕事量[W]を印加磁場の周波数[Hz]及び磁場の強さ[A/m]の2乗で除した指標(ILP)が前記周波数と前記強さとの組み合わせを(500kHz,4kA/m)及び(30kHz,8kA/m)としたときに、ともに3.78×10−9[H・m2/kg]以上であることを特徴とする温熱治療用発熱軟磁性粉体。 - 前記合金は、純鉄、Fe−9.5Si−5.5Al合金又はFe−1Si−13Cr合金のいずれか1つからなることを特徴とする請求項6記載の温熱治療用発熱軟磁性粉体。
- 扁平形状でありアスペクト比が2〜50であることを特徴とする請求項7記載の温熱治療用発熱軟磁性粉体。
- 外部交流磁場の印加によって発熱する温熱治療用発熱複合体であって、請求項6乃至8のうちの1つに記載の温熱治療用発熱軟磁性粉体をマトリクス材料に混合し分散させたことを特徴とする温熱治療用発熱複合体。
- 外部交流磁場の印加によって発熱する温熱治療用発熱シートであって、請求項7又は8に記載の温熱治療用発熱軟磁性粉体をシート状のマトリクス材料に混合し配向分散させたことを特徴とする温熱治療用発熱シート。
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