公开(公告)号：US20040086708A1

公开(公告)日：2004-05-06

申请号：US10287036

申请日：2002-11-04

Applicant: General Electric Company

Inventor： Amitabh Verma ,  Luana Emiliana Iorio ,  K. Anand ,  Srinidhi Sampath ,  Robert John Zabala ,  Kanchan Kumari ,  Geetha Karavoor

IPC: B32B005/16

CPC classification number: H01F1/1475 ,  H01F1/15308 ,  H01F1/15316 ,  H01F41/0246 ,  Y10T428/25 ,  Y10T428/257 ,  Y10T428/31826

Abstract: Soft magnetic composites having a high compressibility and a high permeability are described. These two characteristics are obtained by combining high compressibility iron powder to high permeability powders. The iron powder is of a high compressibility and in a size range and proportion that results in a powder mass amenable to compaction by industrially viable and cost-effective compaction process such as uniaxial cold compaction. The high compressibility iron powder helps achieve high relative density and also allows easy path for the passage of magnetic flux.

Abstract translation: 描述了具有高压缩性和高磁导率的软磁性复合材料。 这两个特点是通过将高压缩性铁粉与高渗透性粉末相结合而得到的。 铁粉具有高的可压缩性，并且在尺寸范围和比例上，导致通过工业上可行且具有成本效益的压实方法（例如单轴冷压实）可以实现压实的粉末质量。 高压缩铁粉有助于实现高相对密度，并且还允许通过磁通的容易路径。

公开(公告)号：US20040084112A1

公开(公告)日：2004-05-06

申请号：US10287884

申请日：2002-11-05

Applicant: General Electric Company

Inventor： Amitabh Verma ,  Luana Emiliana Iorio ,  K. Anand ,  Srinidhi Sampath ,  Kanchan Kumari ,  Geetha Karavoor

IPC: H01F001/06 ,  H01F001/36

CPC classification number: H01F41/0246 ,  H01F1/1475 ,  H01F1/24 ,  Y10T428/12056

Abstract: Ferromagnetic particles with a high-temperature and thermally stable insulating coating are described. The ferromagnetic particles are first coated with a thin layer of a high permeability metal (nickel) by an electroless plating process. The deposited metal layer is then oxidized by controlling the time and temperature while heating the coated particles in an oxygen atmosphere. This process develops a thin and uniform layer of metal oxide on the ferromagnetic particles. The controlled oxidation of the coating helps encapsulate the particles with a thermally stable and electrically non-conducting layer. These particles can then be compacted and then annealed above 500 degrees Celsius to relieve the stresses introduced in the shaping, thereby obtaining articles with a high permeability and low magnetic loss.

Abstract translation: 描述了具有高温和热稳定的绝缘涂层的铁磁颗粒。 铁磁颗粒首先通过无电镀方法涂覆有高导磁率金属（镍）的薄层。 然后通过在氧气氛中加热涂覆的颗粒的同时控制时间和温度来氧化沉积的金属层。 该方法在铁磁颗粒上形成薄而均匀的金属氧化物层。 涂层的受控氧化有助于用热稳定和非导电层包封颗粒。 然后可以将这些颗粒压实，然后在500摄氏度下退火以减轻在成形中引入的应力，从而获得具有高磁导率和低磁损耗的制品。