Ferromagnetic fine particles of .epsilon. iron carbide and method for producing the same
US5552073A · kind A · utility
2Cited by
1References
26Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Sep 3, 1993 |
| Grant date | Sep 3, 1996 |
| Priority date | — |
| Expiry date | Sep 3, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC01P2006/60
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Ferromagnetic granular ultrafine particles consisting essentially of .epsilon.' iron carbide represented by the composition formula: EQU .epsilon.'-Fe.sub.2.2 C having an average particle size of about 0.01 to 0.2 .mu.m, and ferromagnetic acicular ultrafine particles consisting essentially of .epsilon.' iron carbide represented by the composition formula: EQU .epsilon.'-Fe.sub.2.2 C having a major axis of about 0.05 to 0.5 .mu.m, a minor axis of about 0.01 to 0.06 and an axial ratio of 4 to 20, which have good coercive force and a small magnetic domain.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.