发明授权
- 专利标题: Spindle-shaped hematite particles and process for making spindle-shaped hematite particles
- 专利标题(中): 锭状赤铁矿颗粒和制造纺锤形赤铁矿颗粒的方法
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申请号: US09920796申请日: 2001-08-03
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公开(公告)号: US06398863B1公开(公告)日: 2002-06-04
- 发明人: Kenji Okinaka , Masaaki Maekawa
- 申请人: Kenji Okinaka , Masaaki Maekawa
- 优先权: JP10-315080 19981105; JP10-344410 19981203
- 主分类号: C09C124
- IPC分类号: C09C124
摘要:
Spindle-shaped hematite particles obtained form the spindle-shaped goethite particles, can be prevented as highly as possible from causing destruction of particle shape when subjected to a heat-reduction step for producing magnetic spindle-shaped metal particles and magnetic spindle-shaped metal particles containing iron as a main component produced from the spindle-shaped goethite particles or the spindle-shaped hematite particles as a starting material, exhibit a high coercive force, an excellent particle coercive force distribution, a large saturation magnetization and an excellent oxidation stability, and are excellent in a squareness (Br/Bm) of the sheet due to a good dispersibility in a binder resin.
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