公开(公告)号：DE2434058A1

公开(公告)日：1976-02-05

申请号：DE2434058

申请日：1974-07-16

Applicant: BASF AG

Inventor： KOESTER EBERHARD DIPL PHYS DR ,  WUNSCH GERD DIPL CHEM DR ,  DEIGNER PAUL DR ,  STUMPFI WERNER DIPL PHYS DR ,  SCHNEEHAGE HANS HENNING DIPL C

IPC: B22F9/22 ,  C09C1/62 ,  H01F1/06 ,  G11B5/68

Abstract: A process for the manufacture of acicular ferromagnetic metal pigments containing iron, having a reduced field strength distribution and a steeper residual magnetization curve, by applying an alkaline earth metal cation and an organic compound having at least one group capable of forming a chelate to appropriate acicular iron oxides and then reducing the treated oxides.

公开(公告)号：DE2365178A1

公开(公告)日：1975-07-10

申请号：DE2365178

申请日：1973-12-29

Applicant: BASF AG

Inventor： KOESTER EBERHARD DIPL PHYS DR ,  WUNSCH GERD DIPL CHEM DR ,  DEIGNER PAUL DR ,  UHL KARL DIPL ING DR ,  STUMPFI WERNER DIPL PHYS DR ,  STECK WERNER DIPL CHEM DR

IPC: G11B5/62 ,  C04B35/26 ,  C09D5/23 ,  C09D7/12 ,  H01F1/04 ,  H01F1/06 ,  H01F1/09 ,  H01F1/12

Abstract: 1496890 Surface oxidized magnetic powder BASF AG 30 Dec 1974 [29 Dec 1973] 56002/74 Heading C7U A particulate composition comprising Co 0À05 -0À96 Ni 0À95-0À04 is surface oxidized by N 2 O (optionally diluted with N 2 , CO 2 or noble gas) to form antiferromagnetic Co Ni oxide phase magnetically coupled with the ferromagnetic alloy phase. The particulate alloy may contain such amounts of Al, Cr, Fe, Mn and Zn that the magnetic exchange is not completely prevented and the treatment temperature may be up to 450‹C.