KR101768975B1 - Technology of soft magnetic properties in rolled sheet by means of cr coating and thermal diffusion - Google Patents
Technology of soft magnetic properties in rolled sheet by means of cr coating and thermal diffusion Download PDFInfo
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- KR101768975B1 KR101768975B1 KR1020100043726A KR20100043726A KR101768975B1 KR 101768975 B1 KR101768975 B1 KR 101768975B1 KR 1020100043726 A KR1020100043726 A KR 1020100043726A KR 20100043726 A KR20100043726 A KR 20100043726A KR 101768975 B1 KR101768975 B1 KR 101768975B1
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Abstract
본 발명은 연자성 분말을 압연한 판재의 표면에 Cr을 코팅한 다음 열적 확산에 의해 절연층을 형성시켜 보자력 및 철손을 저감시켜 연자성 코어의 특성을 향상시키는 것을 특징으로 하는 압연 판재의 연자성 특성 향상 기술에 관한 것을 제공한다.The present invention is characterized in that Cr is coated on the surface of a plate material rolling a soft magnetic powder and then an insulating layer is formed by thermal diffusion to reduce coercive force and iron loss to improve the characteristics of the soft magnetic core ≪ / RTI >
Description
본 발명은 연자성 압연판재의 연자성 특성을 향상시키기 위한 Cr 코팅 및 열적확산에 의한 압연 판재의 절연층 제어 기술에 관한 것이다. The present invention relates to a Cr coating for improving the soft magnetic characteristics of a soft magnetic rolled plate and an insulation layer control technique of the rolled plate by thermal diffusion.
모터의 고정자(stator)에 사용되는 연자성 판재의 경우, 실리콘(Si)을 포함한 전기강판이 주로 사용되고 있는데, 포화자속밀도는 1.8~2.0T로 높으나, 보자력이 높고, 자기손실이 높다는 단점이 있다. 이를 보완하기 위해 압연한 전기강판 표면에 산화물 코팅 및 열처리 등을 통해 표면저항을 증가시킴으로써 자기손실을 감소시켜 효율을 증가시키려는 시도를 하고 있으나, 200Hz의 주파수 및 1.0T의 자속밀도의 시험조건에서 20 W/kg 이하의 자기손실을 얻지 못하고 있는 실정이다.In the case of a soft magnetic plate used for a stator of a motor, an electric steel sheet containing silicon (Si) is mainly used. The saturation magnetic flux density is as high as 1.8 to 2.0 T, but has a disadvantage of high coercive force and high magnetic loss . In order to compensate for this, attempts have been made to increase the efficiency by reducing the magnetic loss by increasing the surface resistance of the rolled steel sheet through oxide coating and heat treatment. However, in the test conditions of 200 Hz frequency and 1.0 T magnetic flux density, W / kg < / RTI >
향후 자동차 산업이 내연기관을 이용한 자동차에서 하이브리드 자동차 및 전기자동차로 이동함에 따라 추진 모터에 사용되는 고정자의 자기손실에 대한 요구가 엄격해지고 있기 때문에, 보다 높은 모터효율, 소형화 및 경량화를 위해 낮은 자기손실의 연자성 소재 및 가공기술에 대한 요구가 높아지고 있다.
As the automobile industry moves from automobiles using internal combustion engines to hybrid automobiles and electric automobiles, the demand for magnetic loss of the stator used in the propulsion motors becomes stricter. Therefore, in order to achieve higher motor efficiency, smaller size and lighter weight, And the demand for soft magnetic materials and processing technologies of these materials is increasing.
본 발명은 연자성 압연판재의 연자성 특성을 향상시키기 위한 Cr 코팅 및 열적확산에 의한 압연 판재의 절연층 제어 기술을 제공하는 것을 목적으로 한다. An object of the present invention is to provide a technique of controlling the insulation layer of a rolled plate by Cr coating and thermal diffusion to improve the soft magnetic characteristics of the soft rolled plate.
본 발명은 Fe 또는 Fe-Si 연자성 분말 또는 주조재를 압연하여 판재로 제조한 다음, 전해도금에 의해 Cr층을 표면에 형성시키고 열적 확산을 통해 표면반응층 및 산화층을 형성시키는 것을 특징으로 하는 우수한 특성의 연자성 압연판재를 제조하는 방법을 제공한다.The present invention is characterized in that a Fe or Fe-Si soft magnetic powder or a cast material is rolled to form a plate, then a Cr layer is formed on the surface by electrolytic plating, and a surface reaction layer and an oxide layer are formed through thermal diffusion There is provided a method of manufacturing a soft magnetic rolled plate of excellent characteristics.
또한 본 발명의 다른 일 태양으로서, Fe 또는 Fe-Si 연자성 판재의 표면에 Cr을 전해도금에 의해 10~25 두께의 Cr 금속층이 코팅된 연자성 판재의 제조 방법을 제공한다.According to another aspect of the present invention, there is provided a method of manufacturing a soft magnetic plate in which a Cr metal layer of 10 to 25 thickness is coated on the surface of an Fe or Fe-Si soft magnetic plate by electrolytic plating of Cr.
또한 본 발명의 다른 일 태양으로서, Ar 또는 Ar+Air의 분위기, 650~1000의 온도에서 1~5시간의 열적확산을 통해 Fe-Cr/Fe-O의 반응층을 포함한 연자성 판재의 제조 방법을 제공한다.As another aspect of the present invention, there is provided a method for manufacturing a soft magnetic plate including a reaction layer of Fe-Cr / Fe-O through thermal diffusion of Ar or Ar + air at a temperature of 650 to 1000 for 1 to 5 hours .
또한 본 발명은 Fe 또는 Fe-Si 분말을 Can에 주입하여 진공 배기한 다음 용접하는 단계, 열간압연하여 판재를 제조하는 단계, Cr을 전해도금하는 단계, 소정의 분위기 및 온도에서 열적확산시키는 단계를 포함하는 것을 특징으로 하는 우수한 특성의 연자성 압연판재를 제조하는 방법을 제공한다.The present invention also relates to a method of manufacturing a steel plate, which comprises the steps of injecting Fe or Fe-Si powder into a Can, evacuating and vacuuming it, welding, hot rolling to produce a plate, electrolytic plating Cr, The present invention also provides a method of manufacturing a soft magnetic rolled plate of excellent characteristics, which comprises:
특히, 본 발명은, Fe 또는 Fe-Si계 연자성 판재의 표면에 Cr을 전해도금하여 표면에 Cr 금속층을 형성하고, 열적확산을 수행하여 표면에 Fe-Cr/Cr-O의 반응층을 형성하는 것을 특징으로 하는 연자성 판재의 제조 방법을 제공한다.Particularly, the present invention relates to a method for manufacturing a soft magnetic steel plate, comprising the steps of: forming a Cr metal layer on a surface of a Fe or Fe-Si soft magnetic plate by electrolytic plating Cr on the surface thereof and forming a reaction layer of Fe-Cr / Cr- The present invention also provides a method of manufacturing a soft magnetic plate.
여기서, Cr 금속층은 10 ~ 25㎛ 두께로 형성되는 것이 바람직하고, 열적확산은, Ar 또는 Ar+Air의 분위기로, 650 ~ 1000℃의 온도에서 1 ~ 5시간 동안 수행되는 것이 더욱 바람직하다. The Cr metal layer is preferably formed to a thickness of 10 to 25 탆, and the thermal diffusion is more preferably performed at a temperature of 650 to 1000 캜 for 1 to 5 hours in an atmosphere of Ar or Ar + Air.
본 발명에 따른 우수한 특성의 연자성 압연판재를 제조하는 방법은 철손이 낮아 모터 효율이 우수한 연자성 코어를 저비용으로 대량 생산할 수 있다는 장점이 있다. The method of manufacturing the soft magnetic rolled plate of excellent characteristics according to the present invention has an advantage that the iron loss is low and the soft magnetic core having excellent motor efficiency can be mass-produced at a low cost.
도 1은 본 발명의 일 실시예에 따라 표면에 Cr 코팅된 Fe-3.5Si-1.5Al 연자성 판재 TD 단면의 미세구조이다.
도 2는 본 발명의 일 실시예에 따라 Cr 코팅된 Fe-3.5Si-1.5Al 조성의 연자성 판재를 200Hz, 1.0T조건에서, B-H Curve Analysis법에 의해 측정한 보자력의 변화를 나타낸 그래프이다.
도 3은 본 발명의 일 실시예에 따라 Cr 코팅된 Fe-3.5Si-1.5Al 조성의 연자성 판재를 200Hz, 1.0T조건에서, B-H Curve Analysis법에 의해 측정한 자기손실을 나타낸 그래프이다.FIG. 1 is a microstructure of an Fe-3.5Si-1.5Al soft magnetic plate having a Cr coating on its surface according to an embodiment of the present invention.
FIG. 2 is a graph showing changes in coercive force measured by a BH Curve Analysis method at 200 Hz and 1.0 T conditions of a soft magnetic plate having a composition of Cr-coated Fe-3.5Si-1.5Al according to an embodiment of the present invention.
FIG. 3 is a graph showing magnetic loss measured by a BH Curve Analysis method at 200 Hz and 1.0 T conditions of a soft magnetic plate having a composition of Cr-coated Fe-3.5Si-1.5Al according to an embodiment of the present invention.
도 1은 본 발명의 일 실시예에 따라 표면에 Cr 코팅된 Fe-3.5Si-1.5Al 연자성 판재 TD 단면의 미세구조, 도 2 및 도 3은 본 발명의 일 실시예에 따른 공정별 보자력 및 자기손실(철손)의 변화를 B-H Curve Analysis에 의해 측정한 값이다. FIG. 1 is a cross-sectional view illustrating a microstructure of an Fe-3.5Si-1.5Al soft magnetic plate having a Cr coating on its surface according to an embodiment of the present invention; FIGS. 2 and 3 are cross- The change of magnetic loss (iron loss) is measured by BH Curve Analysis.
Fe 또는 Fe-Si 연자성 분말 또는 주조재를 압연하여 판재로 제조한 다음, 전해도금에 의해 Cr층을 표면에 형성시키고 열적 확산을 통해 표면반응층 및 산화층을 형성시키는 것을 특징으로 하는 우수한 특성의 연자성 압연판재를 제조하는 방법을 제공한다.Fe or Fe-Si soft magnetic powder or a cast material is rolled to form a plate, then a Cr layer is formed on the surface by electrolytic plating, and a surface reaction layer and an oxide layer are formed through thermal diffusion. A method for manufacturing a soft magnetic rolled sheet is provided.
본 발명에서는 실시예로서 Fe-3.5wt.Si-1.5wt.Al 조성의 연자성 분말을 가스분무법에 의해 제조한 다음, 63~90의 분말을 분급하여 순동으로 제조한 Can에 주입하고 진공 배기한 다음 용접하여 분말 압연용 Can을 제조하였다. 제조된 Can을 800℃의 온도에서 총압하율 75%로 압연하여 연자성 판재로 제조한 다음 Can을 제거하고, 표면을 연삭한 다음, 전해도금에 의해 Cr코팅을 실시하였다. Cr코팅시 도금액은 증류수 2리터에 500g의 CrO3와 5g의 H2SO4을 용해시켜 제조하였으며, 도금액의 온도는 60℃로 유지하고, 전류를 20~40A로 제어하면서 Cr코팅층의 두께를 10~25㎛로 제어했다. In the present invention, as an example, a soft magnetic powder having a composition of Fe -3.5 wt.Si-1.5 wt. Al was prepared by a gas atomization method, and 63 to 90 powders were classified and injected into a can made of pure water, Next, Can for rolling powder was manufactured by welding. The manufactured can was rolled at a total reduction of 75% at a temperature of 800 ° C to produce a soft magnetic plate, then the can was removed, the surface was ground, and then the Cr coating was performed by electrolytic plating. During the Cr coating, the plating solution was prepared by dissolving 500 g of CrO 3 and 5 g of H 2 SO 4 in 2 liters of distilled water. The temperature of the plating solution was maintained at 60 ° C. and the thickness of the Cr coating layer was adjusted to 10 To 25 mu m.
표면에 Cr이 코팅된 Fe-3.5Si-1.5Al 연자성 판재를 650℃와 1000℃에서 각각 1시간, 5시간 유지하여 열적확산을 통해 Fe-Cr/Cr-O의 표면층을 생성시켰으며, 이들 시험편에 대해 AC B-H Curve Analyzer를 이용하여 200Hz, 1.0T조건 및 1000Hz, 1.0T 조건에서 보자력 및 자기손실(철손)을 측정한 결과를 도 2, 도 3에 나타냈다.The Fe-3.5Si-1.5Al soft magnetic sheet coated with Cr on the surface was maintained at 650 ° C and 1000 ° C for 1 hour and 5 hours, respectively, to generate a surface layer of Fe-Cr / Cr-O through thermal diffusion. The results of measurement of coercive force and magnetic loss (iron loss) under conditions of 200 Hz and 1.0 T and 1000 Hz and 1.0 T using an AC BH Curve Analyzer are shown in FIGS. 2 and 3, respectively.
도 2는 본 발명의 일 실시예에 따라 Cr 코팅된 Fe-3.5Si-1.5Al 조성의 연자성 판재를 200Hz, 1.0T조건에서 측정한 보자력의 변화를 나타낸 그래프이다. 압연직후의 판재 및 표면을 연삭한 판재의 경우, 보자력이 110 A/m였으나, Cr도금 후 650℃에서 1시간 열처리한 경우 58 A/m로 감소했다. FIG. 2 is a graph showing changes in coercive force measured at 200 Hz and 1.0 T under conditions of a Cr-coated Fe-3.5Si-1.5Al composition soft magnetic plate according to an embodiment of the present invention. The plate material immediately after rolling and the surface grinding plate had a coercive force of 110 A / m but decreased to 58 A / m when the plate was heat-treated at 650 ° C for 1 hour after Cr plating.
도 3은 본 발명의 일 실시예에 따라 Cr 코팅된 Fe-3.5Si-1.5Al 조성의 연자성 판재를 200Hz, 1.0T조건에서 측정한 자기손실을 나타낸 그래프이다. 자기손실의 경우, 압연직후의 판재 및 표면을 연삭한 판재에서 10 W/kg이던 철손이 650℃에서 1시간 열처리한 경우 5 W/kg으로 감소했다. 따라서, 본 발명에서 제시한 방법을 통해 200Hz, 1.0T조건에서 보자력이 감소하고 철손이 절반 이하로 감소하는 효과를 확인할 수 있었다.
FIG. 3 is a graph showing magnetic loss measured at 200 Hz and 1.0 T under conditions of a Cr-coated Fe-3.5Si-1.5Al composition soft magnetic plate according to an embodiment of the present invention. In the case of magnetic loss, the iron loss of 10 W / kg in the plate immediately after rolling and the surface of the ground plate was reduced to 5 W / kg in case of 1 hour heat treatment at 650 ° C. Therefore, it was confirmed that the coercive force was decreased and the iron loss was reduced to less than half at 200 Hz and 1.0 T by the method proposed in the present invention.
Claims (3)
얻어진 Fe-Si-Al계 연자성 압연 판재의 표면을 연삭한 다음, 표면에 Cr을 전해도금하여 표면에 Cr 금속층을 형성하고,
열적확산을 수행하여 연자성 압연 판재의 표면에 Fe-Cr/Cr-O의 반응층을 형성하는 것을 특징으로 하는 연자성 판재의 제조 방법.
After the Fe-Si-Al soft magnetic powder is poured into the can and a soft magnetic rolled plate is obtained through rolling, the can is removed,
After the surface of the obtained Fe-Si-Al soft magnetic rolled plate was ground, Cr was electrolytically plated on the surface to form a Cr metal layer on the surface,
And performing thermal diffusion to form a reaction layer of Fe-Cr / Cr-O on the surface of the soft magnetic rolled plate.
Cr 금속층은 10 ~ 25㎛ 두께로 형성되는 것을 특징으로 하는 연자성 판재의 제조방법.
The method according to claim 1,
And the Cr metal layer is formed to a thickness of 10 to 25 占 퐉.
열적확산은, Ar 또는 Ar+Air의 분위기로, 650 ~ 1000℃의 온도에서 1 ~ 5시간 동안 수행되는 것을 특징으로 하는 연자성 판재의 제조방법.
3. The method according to claim 1 or 2,
Wherein the thermal diffusion is performed in an atmosphere of Ar or Ar + Air at a temperature of 650 to 1000 占 폚 for 1 to 5 hours.
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