公开(公告)号：US3925114A

公开(公告)日：1975-12-09

申请号：US46530074

申请日：1974-04-29

Applicant: VICTOR COMPANY OF JAPAN

Inventor： TAKAHASHI NOBORU ,  NAKAMURA MUTSUAKI ,  OZAKI SADAO ,  ISONO HIROMASA ,  FUKUSHIMA IWAO

IPC: B22F9/22 ,  H01F1/06 ,  C22C1/04

CPC classification number: B22F9/22 ,  H01F1/065

Abstract: A crystalline oxalate containing Al in addition to usual Fe, Co and/or Ni in an amount about 1-20 mole% of the total metals is precipitated from a mixed aqueous solution of respective metal chlorides. The Al-containing oxalate gives a magnetic alloy powder having a large coercive force and high residual magnetization through reduction by H2 at a temperature between 300* and 400*C.

公开(公告)号：US3904448A

公开(公告)日：1975-09-09

申请号：US43057574

申请日：1974-01-03

Applicant: VICTOR COMPANY OF JAPAN

Inventor： TAKAHASHI NOBORU ,  CHIBA KOJI ,  NAKAMURA MUTSUAKI ,  OZAKI SADAO ,  ISONO HIROMASA ,  NARUSE TUNEHIDE ,  MISHIHARA TOSHIKAZU ,  FUKUSHIMA IWAO

IPC: B22F1/00 ,  C23C8/26 ,  G11B5/706 ,  H01F1/02 ,  C22C1/04

CPC classification number: G11B5/70615 ,  B22F1/0088 ,  B22F2201/016 ,  B22F2201/02 ,  C22C32/0068 ,  C23C8/26

Abstract: In the course of the reduction of metal salts powder such as a ternary oxalate of Fe, Co and Ni by heating in a reducing atmosphere, a nitrogen-containing compound gas such as NH3 is introduced into the reaction system atmosphere in order to form a layer of metal nitride on the surface of the powder. The nitride layer protects the resulting alloy powder against air-oxidation and deterioration in the magnetic properties.

Abstract translation: 在还原气氛中通过加热还原金属盐粉末如Fe，Co和Ni的三元草酸的过程中，将含氮化合物气体如NH 3引入反应体系气氛中以形成层 的金属氮化物在粉末的表面上。 氮化物层保护所得合金粉末免受空气氧化和磁性能的劣化。