JP2021167467A - 方向性電磁鋼板およびその磁区微細化方法 - Google Patents
方向性電磁鋼板およびその磁区微細化方法 Download PDFInfo
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Abstract
【解決手段】本発明の方向性電磁鋼板は、表面に形成された溝と、その溝下部に形成された凝固合金層とを含み、凝固合金層は、平均粒径が1〜8μmの再結晶を含むことを特徴とする。
【選択図】 図2
Description
電磁鋼板の表面上にさらに非金属酸化物層があってもよい。非金属酸化物層は、Mg2SiO4、Al2SiO4、またはMn2SiO4を含むことができる。さらに、非金属酸化物層上にさらに絶縁コーティング層が形成されていてもよい。溝は、線状であり、電磁鋼板の圧延方向に対して82°〜98°の角度で形成される。溝の深さ(D)は、電磁鋼板の厚さの3%〜8%であることができる。
また、本発明の一実施形態によれば、最終絶縁コーティング後、積鉄心変圧器の鉄心および熱処理を必要とする巻鉄心変圧器の鉄心として使用することができる。
ある部分が他の部分の「上に」あると言う場合、これは、まさに他の部分の上にあったり、その間に他の部分が伴っていてもよい。対照的にある部分が他の部分の「真上に」あると言及する場合、その間に他の部分は介在しない。
したがって、非金属酸化物層40が形成された鋼板は、非金属酸化物層40が形成されない鋼板に比べて、溝20の形成に必要なレーザ出力は20%以上減少して、鉄損を改善するのに効率が高い。
本発明の一実施形態による方向性電磁鋼板の磁区微細化方法は、方向性電磁鋼板を準備する段階と、方向性電磁鋼板の表面にレーザを照射して溝を形成する段階と、溝が形成された部分を400〜1500℃/sの冷却速度で急冷する段階とを含む。以下、各段階別に詳細に説明する。
方向性電磁鋼板を準備する段階は、冷間圧延した電磁鋼板を脱炭焼鈍または窒化焼鈍して、鋼板の表面に酸化層を形成する段階と、酸化層が形成された鋼板の表面に焼鈍分離剤を塗布し高温焼鈍して、鋼板の表面に非金属酸化物層を形成する段階とを含むことができる。
このように、凝固合金層の形成後、再結晶温度以上の熱処理条件で応力緩和焼鈍後の再結晶の形成により鉄損改善効果を2%以上確保すると同時に、磁束密度劣化率1.0%以下で確保できる。
〔実施例〕
冷間圧延した厚さ0.30mmの方向性電磁鋼板を脱炭焼鈍して酸化層を形成した後、MgOを含む焼鈍分離剤を塗布し、高温焼鈍実施して、フォルステライト被膜を形成した。その後、コロイダルシリカと金属リン酸塩とを含む絶縁コーティング液をコーティングして絶縁コーティング層を形成した。
溝の深さ、凝固合金層の厚さ、凝固合金層内の再結晶の平均粒径および応力焼鈍後の再結晶の平均粒径を、表1および表2にまとめた。
20:溝
30:凝固合金層
31:再結晶
32:応力焼鈍後の再結晶
40:非金属酸化物層
50:絶縁コーティング層
Claims (6)
- 電磁鋼板の表面に形成された溝と、
前記溝の下部に形成された凝固合金層とを含み、
前記凝固合金層の厚さは、0.6〜3.0μmであり、
前記凝固合金層は、平均粒径が1〜7μmの再結晶からなることを特徴とする方向性電磁鋼板。 - 前記電磁鋼板の表面上に形成された非金属酸化物層をさらに含むことを特徴とする請求項1に記載の方向性電磁鋼板。
- 前記非金属酸化物層は、Mg2SiO4、Al2SiO4、またはMn2SiO4を含むことを特徴とする請求項2に記載の方向性電磁鋼板。
- 前記非金属酸化物層上に形成された絶縁コーティング層をさらに含むことを特徴とする請求項2または3に記載の方向性電磁鋼板。
- 前記溝は、線状であり、電磁鋼板の圧延方向に対して82°〜98°の角度で形成されたことを特徴とする請求項1〜請求項4のいずれか一項に記載の方向性電磁鋼板。
- 前記溝の深さ(D)は、電磁鋼板の厚さの3%〜8%であることを特徴とする請求項1〜請求項5のいずれか一項に記載の方向性電磁鋼板。
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US20210229217A1 (en) * | 2020-01-27 | 2021-07-29 | National Technology & Engineering Solutions Of Sandia, Llc | Methods for site-specific enhancement of soft magnetic alloys |
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