JP6915690B2 - 方向性電磁鋼板 - Google Patents
方向性電磁鋼板 Download PDFInfo
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- JP6915690B2 JP6915690B2 JP2019529821A JP2019529821A JP6915690B2 JP 6915690 B2 JP6915690 B2 JP 6915690B2 JP 2019529821 A JP2019529821 A JP 2019529821A JP 2019529821 A JP2019529821 A JP 2019529821A JP 6915690 B2 JP6915690 B2 JP 6915690B2
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Description
本願は、2017年7月13日に、日本に出願された特願2017−137416号に基づき優先権を主張し、その内容をここに援用する。
前記切断面で見たとき、前記結晶性燐化物含有層が、前記絶縁皮膜中で前記中間層上に接する領域に位置し、
前記中間層が、化学成分として、Fe含有量:80原子%未満、P含有量:5原子%未満、Si含有量:20原子%以上、O含有量:50原子%以上、Mg含有量:10原子%以下を満足する。
上記絶縁皮膜の下部領域に、上記中間層に接して、結晶性燐化物を含有する結晶性燐化物含有層を有する。
切断方向が板厚方向と平行となる切断面(詳細には、板厚方向と平行かつ圧延方向と垂直な切断面)で見たとき、絶縁皮膜が、中間層上に接する領域に、結晶性燐化物を含有する結晶性燐化物含有層を有する。
上記した四層構造において、基材である母材鋼板は、結晶方位がゴス方位に制御された集合組織を有する。母材鋼板の表面粗度は、特に制限されないが、母材鋼板に大きい張力を付与して鉄損の低減を図る点で、算術平均粗さ(Ra)で0.5μm以下が好ましく、0.3μm以下がより好ましい。なお、母材鋼板の算術平均粗さ(Ra)の下限は、特に制限されないが、0.1μm以下では鉄損改善効果が飽和してくるので下限を0.1μmとしてもよい。
上記四層構造において、中間層は、母材鋼板上に接して配され、母材鋼板と結晶性燐化物含有層を含む絶縁皮膜とを密着させる機能を有する。
上記四層構造において、絶縁皮膜は最表面に位置し、燐酸塩とコロイド状シリカ(SiO2)を主体とする溶液を塗布して焼付けて形成されるガラス質の絶縁皮膜である。
上記四層構造において、結晶性燐化物含有層は、絶縁皮膜中の下部領域に存在し、酸化珪素主体の中間層上に接して配され、かつ絶縁皮膜の上部領域(結晶性燐化物含有層を除いた領域)と接して配される(図3、参照)。結晶性燐化物含有層は、絶縁皮膜において、斑がなくかつ優れた皮膜密着性を確保するうえで重要である。
本発明電磁鋼板の母材鋼板は、例えば、Si:0.8〜7.0%を含有し、C:0.005%以下、N:0.005%以下、SおよびSeの合計量:0.005%以下、ならびに酸可溶性Al:0.005%以下に制限し、残部がFe及び不純物からなる。
Si(シリコン)は、方向性電磁鋼板の電気抵抗を高めて鉄損を低下させる。Si含有量の好ましい下限は0.8%であり、さらに好ましくは2.0%である。一方、Si含有量が7.0%を超えると、母材鋼板の飽和磁束密度が低下するため、鉄心の小型化が難くなる。Si含有量の好ましい上限は7.0%である。
C(炭素)は、母材鋼板中で化合物を形成し、鉄損を劣化させるため、少ないほど好ましい。C含有量は、0.005%以下に制限することが好ましい。C含有量の好ましい上限は0.004%であり、さらに好ましくは0.003%である。Cは少ないほど好ましいので、下限は0%を含むが、Cを0.0001%未満に低減すると、製造コストが大幅に上昇するので、製造上、0.0001%が実質的な下限である。
N(窒素)は、母材鋼板中で化合物を形成し、鉄損を劣化させるため、少ないほど好ましい。N含有量は、0.005%以下に制限することが好ましい。N含有量の好ましい上限は0.004%であり、さらに好ましくは0.003%である。Nは少ないほど好ましいので、下限が0%であればよい。
S(硫黄)及びSe(セレン)は、母材鋼板中で化合物を形成し、鉄損を劣化させるため、少ないほど好ましい。SまたはSeの一方、または両方の合計を0.005%以下に制限することが好ましい。SおよびSeの合計量は、0.004%以下が好ましく、0.003%以下がさらに好ましい。SまたはSeの含有量は少ないほど好ましいので、下限がそれぞれ0%であればよい。
酸可溶性Al(酸可溶性アルミニウム)は、母材鋼板中で化合物を形成し、鉄損を劣化させるため、少ないほど好ましい。酸可溶性Alは、0.005%以下であることが好ましい。酸可溶性Alは、0.004%以下が好ましく、0.003%以下がさらに好ましい。酸可溶性Alは少ないほど好ましいので、下限が0%であればよい。
Mn:0%以上かつ0.15%以下、
Bi:0%以上かつ0.010%以下、
B:0%以上かつ0.080%以下、
Ti:0%以上かつ0.015%以下、
Nb:0%以上かつ0.20%以下、
V:0%以上かつ0.15%以下、
Sn:0%以上かつ0.30%以下、
Sb:0%以上かつ0.30%以下、
Cr:0%以上かつ0.30%以下、
Cu:0%以上かつ0.40%以下、
P:0%以上かつ0.50%以下、
Ni:0%以上かつ1.00%以下、及び
Mo:0%以上かつ0.10%以下。
C(炭素)は、一次再結晶集合組織を制御するうえで有効な元素である。Cは0.005%以上であることが好ましい。また、Cは、0.02%以上、0.04%以上、0.05%以上であることがさらに好ましい。Cが0.085%を超えると、脱炭工程で脱炭が十分に進行せず、所要の磁気特性が得られないので、Cは0.085%以下が好ましい。より好ましくは0.065%以下である。
(a)仕上げ焼鈍で生成したフォルステライト等の無機鉱物質の皮膜を、酸洗、研削等の手段で除去した母材鋼板を焼鈍し、又は、
(b)仕上げ焼鈍で上記無機鉱物質の皮膜の生成を抑制した母材鋼板を焼鈍し、
(c)上記焼鈍(熱酸化焼鈍、露点を制御した雰囲気下での焼鈍)によって、母材鋼板の表面上に酸化珪素を主体とする中間層を形成し、
(d)この中間層上に、燐酸塩とコロイド状シリカを主体とし、結晶性燐化物を含む結晶性燐化物含有層形成溶液を塗布して焼付け、
(e)上記の焼付け後に、燐酸塩とコロイド状シリカを主体とし、結晶性燐化物を含まない絶縁皮膜形成溶液を塗布してさらに焼付ける。
本発明製造方法によって、絶縁皮膜中の下部領域に、上記中間層上に接する結晶性燐化物含有層を形成することができる。
表1に示す成分組成の素材鋼片を1150℃で60分均熱してから熱間圧延に供し、2.3mm厚の熱延鋼板とした。次いで、この熱延鋼板に、1120℃で200秒保持した後、直ちに冷却して、900℃で120秒保持し、その後に急冷する熱延板焼鈍を施した。この熱延焼鈍板を酸洗後、冷間圧延に供し、最終板厚0.23mmの冷延鋼板とした。
焼付温度〜700℃の温度域:PH2O/PH2≦0.01
700℃〜300℃の温度域:PH2O/PH2≦0.008
試験片A12では溶液に(Fe、Cr)3Pを混合して製造し、結晶性燐化物含有層に(Fe、Cr)3Pが存在することを確認した。
試験片A13では溶液に(Fe、Cr)P2を混合して製造し、結晶性燐化物含有層に(Fe、Cr)P2が存在することを確認した。
これら試験片A12およびA13の評価結果は、試験片A2の評価結果と同等であることを確認した。
2 フォルステライト皮膜
3 絶縁皮膜
4 中間層
5 結晶性燐化物
6 結晶性燐化物含有層
Claims (7)
- 母材鋼板と、前記母材鋼板上に接して配された中間層と、前記中間層上に接して配されて最表面となる絶縁皮膜とを有する方向性電磁鋼板において、
切断方向が板厚方向と平行となる切断面で見たとき、前記絶縁皮膜が、結晶性燐化物を含有する結晶性燐化物含有層を有し、
前記切断面で見たとき、前記結晶性燐化物含有層が、前記絶縁皮膜中で前記中間層上に接する領域に位置し、
前記中間層が、化学成分として、Fe含有量:80原子%未満、P含有量:5原子%未満、Si含有量:20原子%以上、O含有量:50原子%以上、Mg含有量:10原子%以下を満足する
ことを特徴とする方向性電磁鋼板。 - 前記切断面で見たとき、前記結晶性燐化物含有層の平均厚さが、前記絶縁皮膜の平均厚さの1/10以上かつ1/2以下である
ことを特徴とする請求項1に記載の方向性電磁鋼板。 - 前記切断面で見たとき、前記結晶性燐化物含有層に対する前記結晶性燐化物の面積分率が平均で5〜50%である
ことを特徴とする請求項1又は2に記載の方向性電磁鋼板。 - 前記切断面で見たとき、前記結晶性燐化物の円相当直径が平均で5〜300nmである
ことを特徴とする請求項1〜3のいずれか1項に記載の方向性電磁鋼板。 - 前記結晶性燐化物が、化学成分として、Fe、Cr、P、およびOを合計で70原子%以上かつ100原子%以下含有し、Siが10原子%以下に制限される
ことを特徴とする請求項1〜4のいずれか1項に記載の方向性電磁鋼板。 - 前記結晶性燐化物として、FeP、Fe2P、Fe3P、FeP2、またはFe2P2O7、の少なくとも1種が含まれる
ことを特徴とする請求項5に記載の方向性電磁鋼板。 - 前記結晶性燐化物として、(Fe、Cr)P、(Fe、Cr)2P、(Fe、Cr)3P、(Fe、Cr)P2、または(Fe、Cr)2P2O7、の少なくとも1種が含まれる
ことを特徴とする請求項5または6に記載の方向性電磁鋼板。
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