JP3272211B2 - Method of forming insulating film on magnetic domain controlled unidirectional silicon steel sheet - Google Patents
Method of forming insulating film on magnetic domain controlled unidirectional silicon steel sheetInfo
- Publication number
- JP3272211B2 JP3272211B2 JP23501595A JP23501595A JP3272211B2 JP 3272211 B2 JP3272211 B2 JP 3272211B2 JP 23501595 A JP23501595 A JP 23501595A JP 23501595 A JP23501595 A JP 23501595A JP 3272211 B2 JP3272211 B2 JP 3272211B2
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- Prior art keywords
- steel sheet
- film
- insulating film
- silicon steel
- forming
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Description
【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION
【０００１】[0001]
【発明の属する技術分野】本発明はフォルステライト
（Ｍｇ2 ＳｉＯ4 ）等の無機鉱物質皮膜の生成を意図的
に防止して製造した仕上げ焼鈍済みの一方向性珪素鋼板
や、フォルステライト等の無機鉱物質皮膜を酸洗等の手
段で除去したり、さらには鏡面ないしはそれに近い状態
に調製した仕上げ焼鈍済みの一方向性珪素鋼板に対し、
良好な鉄損を得ることができるように張力付与型の絶縁
性皮膜を形成する方法に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a finish-annealed unidirectional silicon steel sheet manufactured by intentionally preventing the formation of an inorganic mineral film such as forsterite (Mg 2 SiO 4 ), and forsterite. The inorganic mineral film is removed by means such as pickling or the like, and the finish-annealed unidirectional silicon steel sheet prepared to a mirror surface or a state close to it is
The present invention relates to a method for forming a tension-imparting insulating film so that good iron loss can be obtained.
【０００２】[0002]
【従来の技術】一方向性珪素鋼板は磁気鉄芯材料として
多用されており、特にエネルギーロスを少なくするため
に鉄損の少ない材料が求められている。この鉄損の低減
には鋼板に張力を付与することが有効であることから、
鋼板に比べ熱膨張係数の小さい材質からなる皮膜を高温
で形成することによって鋼板に張力を付与し、鉄損低減
が図られてきた。仕上げ焼鈍工程で鋼板表面の酸化物と
焼鈍分離剤とが反応して生成するフォルステライト系皮
膜は、鋼板に張力を与えることができ、皮膜密着性も優
れている。2. Description of the Related Art A grain-oriented silicon steel sheet is widely used as a magnetic iron core material. In particular, a material having a small iron loss is required to reduce energy loss. Since it is effective to apply tension to the steel sheet to reduce this iron loss,
By forming a film made of a material having a smaller coefficient of thermal expansion than a steel sheet at a high temperature, tension has been applied to the steel sheet to reduce iron loss. The forsterite-based coating formed by the reaction between the oxide on the steel sheet surface and the annealing separator in the finish annealing step can give tension to the steel sheet and has excellent coating adhesion.
【０００３】さらに、特開昭４８−３９３３８号公報で
開示されたコロイド状シリカとリン酸塩を主体とするコ
ーティング液を焼き付けることによって絶縁皮膜を形成
する方法は、鋼板に対する張力付与の効果が大きく、鉄
損低減に有効である。したがって、仕上げ焼鈍工程で生
じたフォルステライト系皮膜を残した上でリン酸塩を主
体とする絶縁皮膜を形成することが一般的な一方向性珪
素鋼板の製造方法となっている。Furthermore, the method of forming an insulating film by baking a coating solution mainly composed of colloidal silica and phosphate disclosed in Japanese Patent Application Laid-Open No. 48-39338 has a large effect of imparting tension to a steel sheet. It is effective for reducing iron loss. Therefore, it is a general method for producing a unidirectional silicon steel sheet to form a phosphate-based insulating film while leaving the forsterite-based film generated in the finish annealing step.
【０００４】一方、近年、フォルステライト系皮膜と地
鉄の乱れた界面構造が、鉄損に対する皮膜張力効果をあ
る程度減少させていることが明らかになってきた。そこ
で、例えば、特開昭４９−９６９２０号公報に開示され
ている如く、仕上げ焼鈍工程で生ずるフォルステライト
系皮膜を除去したり、さらに鏡面化仕上げを行った後、
改めて張力皮膜を形成させることにより、さらなる鉄損
低減を試みる技術が開発された。On the other hand, in recent years, it has become clear that the disordered interface structure between the forsterite-based coating and the ground iron reduces the effect of the coating tension on iron loss to some extent. Therefore, for example, as disclosed in Japanese Patent Application Laid-Open No. 49-96920, after removing a forsterite-based film generated in a finish annealing step or further performing a mirror finish,
A technique was developed to try to further reduce iron loss by forming a tension film again.
【０００５】しかしながら、上記絶縁皮膜はフォルステ
ライトを主体とする皮膜の上に形成した場合はかなりの
皮膜密着性が得られるものの、フォルステライト系皮膜
を除去したり、あるいは仕上げ焼鈍工程で意図的にフォ
ルステライト形成を行わなかったものに対しては皮膜密
着性が十分ではない。[0005] However, when the above-mentioned insulating film is formed on a film mainly composed of forsterite, a considerable film adhesion can be obtained, but the forsterite-based film is removed or intentionally used in the finish annealing step. The film adhesion is not sufficient for the one without forsterite formation.
【０００６】フォルステライト系皮膜の除去を行った場
合はコーティング液を塗布して形成させる張力付与型絶
縁皮膜のみで所要の皮膜張力を確保する必要があり、必
然的に厚膜化しなければならず、より一層の密着性が必
要である。When the forsterite-based film is removed, it is necessary to secure a required film tension only with a tension-applying insulating film formed by applying a coating liquid, and the film must be thickened inevitably. Further, further adhesion is required.
【０００７】したがって、従来の皮膜形成法では鏡面化
の効果を十分に引き出すほどの皮膜張力を達成すること
は困難であり、十分な鉄損低減が図られていなかった。
そこで、特開昭６０−１３１９７６号公報において、仕
上げ焼鈍後、表面酸化層を除去し、ついで表面を鏡面状
態に加工した後、弱酸化性雰囲気で焼鈍し、膜厚０．０
５〜０．５μｍのＳｉＯ2 酸化層を形成し、張力付与型
の絶縁皮膜を形成する方法が開示された。[0007] Therefore, it is difficult to achieve a film tension sufficient to bring out the effect of mirror finishing by the conventional film forming method, and a sufficient reduction in iron loss has not been achieved.
Therefore, in Japanese Unexamined Patent Publication No. 60-131976, after the finish annealing, the surface oxide layer is removed, the surface is processed into a mirror surface state, and then the film is annealed in a weakly oxidizing atmosphere to obtain a film thickness of 0.0
A method of forming a 5-0.5 μm SiO 2 oxide layer and forming a tension-imparting insulating film has been disclosed.
【０００８】また、特開平６−１８４７６２号公報にお
いては、鋼板表面に無機鉱物質皮膜のない一方向性珪素
鋼板に対し、Ｐ H2 O ／Ｐ H2 と温度を制御して熱処理
し、鋼板表面に０．００１μｍ以上の外部酸化膜のみか
らなるＳｉＯ2 を形成したのち、張力付与型の絶縁皮膜
を形成する方法が開示された。In Japanese Patent Application Laid-Open No. 6-184762, a unidirectional silicon steel sheet having no inorganic mineral substance film on the surface of the steel sheet is heat-treated by controlling the temperature of PH 2 O / P H 2 and controlling the temperature of the steel sheet. After forming the SiO 2 consisting of only more external oxide film 0.001μm on the surface, a method of forming a tension-imparting insulating film it has been disclosed.
【０００９】[0009]
【発明が解決しようとする課題】しかしながら、これら
従来技術においては以下に述べるような問題点があっ
た。まず、特開昭６０−１３１９７６号公報において開
示された技術について述べる。該公報には絶縁皮膜の形
成に先立ち、鋼板表面層０．０５〜０．５μｍの領域に
ＳｉＯ2 粒子が分散した酸化層を形成させることによっ
て、絶縁皮膜の密着性が確保できることが述べられてい
る。この方法によって皮膜密着性が改善される場合もあ
る。However, these prior arts have the following problems. First, the technology disclosed in Japanese Patent Application Laid-Open No. 60-131976 will be described. The publication states that the adhesion of the insulating film can be ensured by forming an oxide layer in which SiO 2 particles are dispersed in a region of 0.05 to 0.5 μm of the steel sheet surface layer before forming the insulating film. I have. In some cases, the film adhesion may be improved by this method.
【００１０】しかしながら、該明細書中の本文に記載さ
れている酸化層、即ち鋼中にＳｉＯ2 粒子が分散した酸
化層を鋼板表面に形成させることは、一旦、調製した鏡
面状態を再度、粗面化することにほかならない。その結
果、鏡面上に張力皮膜を形成した場合に比べ、十分な鉄
損低減効果を得ることができにくいという問題点があっ
た。However, forming an oxide layer described in the text of the specification, that is, an oxide layer in which SiO 2 particles are dispersed in steel, on the surface of the steel sheet requires once preparing the mirror surface state again. It is nothing but face. As a result, there is a problem that it is difficult to obtain a sufficient iron loss reduction effect as compared with a case where a tension film is formed on a mirror surface.
【００１１】また、特開平６−１８４７６２号公報に
は、絶縁皮膜形成に先立ち、温度と雰囲気を制御した条
件で熱処理し、０．００１μｍ以上の外部酸化膜のみか
らなるＳｉＯ2 を鋼板表面に形成し、絶縁皮膜の密着性
を確保できることが述べられている。この方法によっ
て、皮膜密着性をそれなりに改善することができる。し
かしながら、外部酸化型のＳｉＯ2 膜の量を増大させて
いくと鋼板鏡面化による鉄損低減効果が若干減殺される
という問題点があった。Japanese Patent Application Laid-Open No. 6-184762 discloses that prior to the formation of an insulating film, heat treatment is performed under controlled conditions of temperature and atmosphere to form SiO 2 consisting of only an external oxide film of 0.001 μm or more on the surface of a steel sheet. However, it is described that the adhesion of the insulating film can be ensured. By this method, the film adhesion can be improved to some extent. However, when the amount of the external oxidation type SiO 2 film is increased, there is a problem that the iron loss reduction effect due to the mirror finishing of the steel sheet is slightly reduced.
【００１２】[0012]
【課題を解決するための手段】本発明は上述の問題点を
解決し無機鉱物質皮膜のない仕上げ焼鈍済みの一方向性
珪素鋼板に対し、良好な鉄損を得ることができるよう張
力付与型の絶縁性皮膜を形成させる方法である。DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems and provides a tension imparting type steel sheet having a finish-annealed unidirectional silicon steel sheet without an inorganic mineral substance film so as to obtain good iron loss. This is a method of forming an insulating film.
【００１３】本発明の要旨は次の通りである。 （１）鋼板表面に無機鉱物質皮膜のない仕上げ焼鈍済み
一方向性珪素鋼板に対し、熱処理により外部酸化型のＳ
ｉＯ2 膜を形成した後、コーティング液を塗布し、焼き
付けることによって非晶質主体の張力付与型絶縁皮膜を
形成する方法において、コーティング液の塗布に先立
ち、該鋼板表面に形成する外部酸化型ＳｉＯ2 膜の量を
片面当たり１００mg／ｍ2 以下として界面荒れを防止す
ることを特徴とする磁区制御一方向性珪素鋼板の絶縁皮
膜形成方法。 （２）張力付与型の絶縁皮膜を形成させるコーティング
液がリン酸塩とコロイド状シリカを主体とすることを特
徴とする（１）に記載の磁区制御一方向性珪素鋼板の絶
縁皮膜形成方法。The gist of the present invention is as follows. (1) to finish annealing been oriented silicon steel sheet free of inorganic mineral coating on the surface of the steel sheet, the external oxidation type heat treatment S
In a method of forming an amorphous-based tension-imparting insulating film by applying and baking a coating solution after forming an iO 2 film, an external oxidation type SiO formed on the surface of the steel sheet prior to application of the coating solution is provided. 2. A method for forming an insulating film on a magnetic domain controlled unidirectional silicon steel sheet, wherein the amount of the film is 100 mg / m 2 or less per side to prevent interface roughness. (2) The method for forming an insulating film on a magnetic domain controlled unidirectional silicon steel sheet according to (1), wherein the coating liquid for forming the tension imparting type insulating film is mainly composed of phosphate and colloidal silica.
【００１４】以下、発明の詳細について説明する。発明
者らは鉄損値に対し、外部酸化型ＳｉＯ2 膜に適正量が
あるのではないかと予想し、以下に述べる手順で検討を
行った。まず、実験に供する試料を作製するため、脱炭
焼鈍板の表面酸化層を酸洗によって除去し表面にＡｌ2
Ｏ3 粉末をふりかけて鋼板どうしの焼き付きを防止した
上で仕上げ焼鈍を行った。このようにして調製した鋼板
表面は鏡面状態を呈する。The details of the present invention will be described below. The present inventors anticipated that the external oxidation type SiO 2 film may have an appropriate amount with respect to the iron loss value, and studied in the following procedure. First, in order to prepare a sample to be used for the experiment, the surface oxide layer of the decarburized annealed plate was removed by pickling, and Al 2
Finish annealing was performed after sprinkling O 3 powder to prevent seizure between the steel sheets. The surface of the steel sheet thus prepared exhibits a mirror surface state.
【００１５】ついで、鋼板表面に外部酸化型のＳｉＯ2
膜を形成させるため、雰囲気中のＰH2 O ／Ｐ H2 をか
えて８５０℃で１２０秒間熱処理を行った。次に、リン
酸アルミニウムとコロイド状シリカを主成分とするコー
ティング液を塗布、焼き付けし、非晶質の張力付与型絶
縁皮膜を形成させた。最後に皮膜付き試料の鉄損値を測
定した。Next, an external oxidation type SiO 2 is formed on the surface of the steel sheet.
In order to form a film, heat treatment was performed at 850 ° C. for 120 seconds while changing PH 2 O / P H 2 in the atmosphere. Next, a coating solution containing aluminum phosphate and colloidal silica as main components was applied and baked to form an amorphous tension-imparting insulating film. Finally, the iron loss value of the coated sample was measured.
【００１６】結果をまとめたものが図１である。図１か
ら外部酸化型のＳｉＯ2 量を片面当たり１００mg／ｍ2
以下にした時、低い（良好な）鉄損値を得ることができ
ることがわかる。FIG. 1 summarizes the results. From FIG. 1, the amount of external oxidation type SiO 2 was 100 mg / m 2 per one side.
It can be seen that a lower (good) iron loss value can be obtained when:
【００１７】なお、鉄損値の測定はレーザー照射法によ
る磁区制御処理を施し、かつ磁束密度（一般にＢ8 で代
表される）が１．９３テスラ前後の試料について行っ
た。一般に、一方向性珪素鋼板の鉄損値は試料の磁区の
大きさと磁束密度の影響を受ける。そのため、磁区制御
を施し磁区の大きさが等しく、かつ磁束密度についても
ほぼ同じ値の試料について鉄損値を測定し比較した。こ
れによって鉄損値に対する外部酸化型のＳｉＯ2 量の影
響のみを抽出できる。[0017] The measurement of the iron loss is subjected to a magnetic domain control treatment by laser irradiation, and (represented generally at B 8) the magnetic flux density was performed on 1.93 Tesla before and after the sample. Generally, the iron loss value of a unidirectional silicon steel sheet is affected by the size of the magnetic domain and the magnetic flux density of the sample. Therefore, magnetic domain control was performed, and iron loss values were measured and compared for samples having the same magnetic domain size and substantially the same magnetic flux density. As a result, it is possible to extract only the influence of the external oxidation type SiO2 amount on the iron loss value.
【００１８】[0018]
【発明の実施の形態】鉄損値に及ぼす外部酸化型のＳｉ
Ｏ2 量の影響については次のように推測している。一般
に、酸化膜は酸化物粒子が金属表面に分散した形態をも
つもの（内部酸化型）と酸化膜が金属表面を被覆した形
態をもつもの（外部酸化型）に分類できる。後者の外部
酸化型のＳｉＯ2 を鋼板表面に形成させる場合、あらか
じめ表面を鏡面状態に調製しておけばＳｉＯ2 を形成さ
せてもその界面は平坦であるとこれまでは予想してい
た。BEST MODE FOR CARRYING OUT THE INVENTION The effect of external oxidation type Si on the iron loss value
The influence of the O 2 amount is estimated as follows. In general, oxide films can be classified into those in which oxide particles are dispersed on the metal surface (internal oxidation type) and those in which the oxide film covers the metal surface (external oxidation type). In the case of forming the latter externally oxidized type SiO 2 on the surface of a steel sheet, it has been assumed that the interface is flat even if the surface is prepared in advance in a mirror state even if the SiO 2 is formed.
【００１９】しかしながら、生成させるＳｉＯ2 量が１
００mg／ｍ2 より多くなると外部酸化型のＳｉＯ2 膜と
いえども、ＳｉＯ2 と金属との間に界面荒れを生じるの
ではないかと推測している。そのため、片面当たりのＳ
ｉＯ2 形成量を１００mg／ｍ2 以下にし、界面荒れの起
こっていない状態では鉄損値は良好であるが、片面当た
りのＳｉＯ2 形成量が１００mg／ｍ2 より多くなると微
小な界面荒れが起こり鉄損値が劣化するものと考えてい
る。However, when the amount of SiO 2 to be generated is 1
It is speculated that if the amount is more than 00 mg / m 2 , even if it is an external oxidation type SiO 2 film, interface roughness may occur between SiO 2 and the metal. Therefore, S per side
The iron loss value is good when the amount of formed iO 2 is 100 mg / m 2 or less and no interface roughness occurs, but when the amount of SiO 2 formed on one side exceeds 100 mg / m 2 , minute interface roughness occurs. We believe that the iron loss value will deteriorate.
【００２０】[0020]
【実施例】Ｓｉを３．２５％含有する最終板厚０．２３
mmに冷間圧延された珪素鋼板に対し、脱炭焼鈍を行っ
た。この時、鋼板表面にはＳｉＯ2 を含む酸化層が形成
される。ついで、この鋼板に対し、ＭｇＯを主体とする
焼鈍分離剤を塗布し、最終仕上げ焼鈍を行った。このよ
うにして焼鈍した一方向性珪素鋼板表面にはフォルステ
ライトを主体とする皮膜が存在している。このフォルス
テライト系皮膜付きの鋼板を硫酸とフッ化アンモニウム
の水溶液に浸漬することによりフォルステライト系皮膜
を除去し、さらにフッ酸と過酸化水素の混合水溶液中で
化学研磨し表面を鏡面状態に仕上げた。[Example] Final plate thickness 0.23 containing 3.25% of Si
A decarburizing annealing was performed on the silicon steel sheet cold-rolled to the mm. At this time, an oxide layer containing SiO 2 is formed on the surface of the steel sheet. Next, an annealing separator mainly composed of MgO was applied to the steel sheet, and final finishing annealing was performed. A coating mainly composed of forsterite exists on the surface of the annealed silicon steel sheet thus annealed. The steel plate with the forsterite coating is immersed in an aqueous solution of sulfuric acid and ammonium fluoride to remove the forsterite coating, and then chemically polished in a mixed aqueous solution of hydrofluoric acid and hydrogen peroxide to finish the surface to a mirror finish. Was.
【００２１】次に、この試料を水素７５％、窒素２５
％、露点０℃と＋１５℃雰囲気中で８５０℃、１２０秒
間焼鈍し、それぞれ表面に片面当たり２０mg／ｍ2 と１
２０mg／ｍ2 の非晶質の外部酸化状のＳｉＯ2 を形成さ
せた。続いて、この鋼板表面に濃度２０％のコロイド状
シリカの懸濁液１００ml、濃度５０％のリン酸アルミニ
ウム溶液１００ml、無水クロム酸５ｇからなるコーティ
ング液を溝付きロールによって片面当たり９ｇ／ｍ2 塗
布し、窒素雰囲気中で８５０℃、１２０秒間焼き付け、
非晶質のリン酸アルミニウムを主体とする皮膜を形成さ
せた。最後にレーザー照射法による磁区制御を施し、鉄
損を測定した。Next, this sample was subjected to 75% hydrogen and 25% nitrogen.
%, 850 ° C. at a dew point of 0 ℃ and + 15 ° C. in an atmosphere, 120 seconds annealing, per side 20 mg / m 2 on the surface respectively 1
20 mg / m 2 of amorphous externally oxidized SiO 2 was formed. Subsequently, a coating solution consisting of 100 ml of a suspension of colloidal silica having a concentration of 20%, 100 ml of a solution of aluminum phosphate having a concentration of 50%, and 5 g of chromic anhydride was applied to the surface of the steel sheet by a grooved roll at a rate of 9 g / m 2 per side. Baking in a nitrogen atmosphere at 850 ° C. for 120 seconds,
A film mainly composed of amorphous aluminum phosphate was formed. Finally, the magnetic domain was controlled by a laser irradiation method, and the iron loss was measured.
【００２２】結果を表１に示す。外部酸化型のＳｉＯ2
量が１２０mg／ｍ2 である比較例に比べ、同ＳｉＯ2 量
が２０mg／ｍ2 である本発明の方が鉄損値が低く優れて
いる。以上本発明の一例について説明したが、勿論本発
明はかかる実施例に限定されない。The results are shown in Table 1. External oxidation type SiO 2
Amount as compared with Comparative Examples is 120 mg / m 2, an iron loss value towards the present invention the SiO 2 amount is 20 mg / m 2 is excellent low. Although an example of the present invention has been described above, the present invention is, of course, not limited to the embodiment.
【００２３】[0023]
【表１】 [Table 1]
【００２４】[0024]
【発明の効果】本発明によって界面荒れを起こさず、張
力付与型絶縁皮膜を形成できるので、低い（優れた）鉄
損値を得ることができる。According to the present invention, a tension-imparting insulating film can be formed without causing interface roughening, so that a low (excellent) iron loss value can be obtained.
【図１】鉄損値に及ぼす外部酸化型ＳｉＯ2 形成量の影
響を示す図表である。FIG. 1 is a chart showing the effect of the amount of external oxidation type SiO 2 formation on the iron loss value.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 牛神 義行 富津市新富20−１ 新日本製鐵株式会社 技術開発本部内 (56)参考文献 特開 平６−184762（ＪＰ，Ａ) 特開 昭60−131976（ＪＰ，Ａ) 特開 平３−130376（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C23C 22/00 - 22/86 C21D 9/46 501 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Yoshiyuki Ushigami 20-1 Shintomi, Futtsu Nippon Steel Corporation Technology Development Division (56) References JP-A-6-184762 (JP, A) JP-A Sho 60-131976 (JP, A) JP-A-3-130376 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) C23C 22/00-22/86 C21D 9/46 501
Claims (2)
焼鈍済み一方向性珪素鋼板に対し、熱処理により外部酸
化型のＳｉＯ2 膜を形成した後、コーティング液を塗布
し、焼き付けることによって非晶質主体の張力付与型絶
縁皮膜を形成する方法において、コーティング液の塗布
に先立ち、該鋼板表面に形成する外部酸化型ＳｉＯ2 膜
の量を片面当たり１００mg／ｍ2 以下として界面荒れを
防止することを特徴とする磁区制御一方向性珪素鋼板の
絶縁皮膜形成方法。1. An external oxidation type SiO 2 film is formed by heat treatment on a finish-annealed unidirectional silicon steel sheet having no inorganic mineral substance film on the surface of the steel sheet, and then a coating liquid is applied and baked to form an amorphous state. In the method of forming a tension-imparting insulating film mainly composed of a material, prior to the application of a coating liquid, the amount of the external oxidation type SiO 2 film formed on the surface of the steel sheet is controlled to 100 mg / m 2 or less per one side to prevent interface roughening. A method for forming an insulating film on a magnetic domain controlled unidirectional silicon steel sheet, comprising the steps of:
ティング液がリン酸塩とコロイド状シリカを主体とする
ことを特徴とする請求項１に記載の磁区制御一方向性珪
素鋼板の絶縁皮膜形成方法。2. The formation of an insulating film on a magnetic domain controlled unidirectional silicon steel sheet according to claim 1, wherein the coating liquid for forming the tension imparting type insulating film is mainly composed of phosphate and colloidal silica. Method.
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|---|---|---|---|
| JP23501595A JP3272211B2 (en) | 1995-09-13 | 1995-09-13 | Method of forming insulating film on magnetic domain controlled unidirectional silicon steel sheet |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23501595A JP3272211B2 (en) | 1995-09-13 | 1995-09-13 | Method of forming insulating film on magnetic domain controlled unidirectional silicon steel sheet |
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| Publication Number | Publication Date |
|---|---|
| JPH0978252A JPH0978252A (en) | 1997-03-25 |
| JP3272211B2 true JP3272211B2 (en) | 2002-04-08 |
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ID=16979816
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| JP23501595A Expired - Lifetime JP3272211B2 (en) | 1995-09-13 | 1995-09-13 | Method of forming insulating film on magnetic domain controlled unidirectional silicon steel sheet |
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| JP4025514B2 (en) * | 2001-04-09 | 2007-12-19 | 新日本製鐵株式会社 | Insulating film forming method for unidirectional silicon steel sheet with excellent magnetic properties and film adhesion |
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| JPS60131976A (en) * | 1983-12-19 | 1985-07-13 | Kawasaki Steel Corp | Manufacture of grain-oriented silicon steel sheet having superior iron loss characteristic |
| JP2670155B2 (en) * | 1989-10-17 | 1997-10-29 | 川崎製鉄株式会社 | Method for producing unidirectional silicon steel sheet with extremely good magnetic properties |
| JP2698003B2 (en) * | 1992-08-25 | 1998-01-19 | 新日本製鐵株式会社 | Method for forming insulating film on unidirectional silicon steel sheet |
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