公开(公告)号：DE2935358A1

公开(公告)日：1981-03-26

申请号：DE2935358

申请日：1979-09-01

Applicant: BASF AG

Inventor： STECK WERNER DIPL CHEM DR ,  SARNECKI WILHELM DIPL CHEM DR ,  MAROSI LASZLO DIPL CHEM DR ,  OHLINGER MANFRED DIPL CHEM DR ,  LOESER WERNER DIPL ING DR

IPC: G11B5/706 ,  B22F9/22 ,  C09D5/23 ,  C09D7/12 ,  G11B5/70 ,  H01F1/06 ,  C01G49/02 ,  G11B5/62

Abstract: A process for the manufacture of acicular ferromagnetic iron particles by heating a goethite, provided with a shape-stabilizing surface coating, at 250 DEG -450 DEG C. in an atmosphere containing water vapor at a partial pressure of not less than 30 mbar, to give alpha-iron(III) oxide, and reducing this material with hydrogen at 275 DEG -425 DEG C., and the use of the iron particles thus obtained as magnetic material in the production of magnetic recording media.