公开(公告)号：US3855691A

公开(公告)日：1974-12-24

申请号：US33730873

申请日：1973-03-02

申请人： LIGNES TELEGRAPH TELEPHON

发明人： DESCHAMPS A ,  FAYE G

IPC分类号： C04B35/26 ,  H01F1/03 ,  H01F1/37 ,  H01P1/32 ,  H01F3/08

CPC分类号： H01F1/37 ,  C04B35/265 ,  C04B35/2675 ,  H01F1/0311 ,  H01P1/32 ,  Y10T29/49076

摘要： A part made of ferrimagnetic material with a spatial variation of the permeability value is obtained through heat treatment of a body of ferrimagnetic material at the temperture such that the free energy of the material is low and that a transformation into a material with higher free energy is obtained, stopping said heating before complete transformation and further machining of the part. The heat treatment is carried out under reduced pressure when a liquid phase develops at the heating temperature. When solid phase is maintained the body is heated in presence of a metal salt or oxide.

摘要翻译： 通过在该温度下对铁氧体材料的体进行热处理，使得材料的自由能低，并且转化为具有较高自由能的材料，得到具有透气性值的空间变化的亚铁磁性材料的部分 在完成转换之前停止所述加热并进一步加工零件。 当在加热温度下发生液相时，在减压下进行热处理。 当固相保持时，身体在金属盐或氧化物的存在下被加热。