Investigation on the La Replacement and Little Additive Modification of High-Performance Permanent Magnetic Strontium-Ferrite
| Autor: | Guan-Ming Chen, Ching-Chien Huang, Chin-Chieh Mo, Hsiao-Hsuan Hsu, Guo-Jiun Shu |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Materials science
Analytical chemistry chemistry.chemical_element Bioengineering fine mill 02 engineering and technology TP1-1185 strontium-ferrite replacement 01 natural sciences law.invention law 0103 physical sciences Chemical Engineering (miscellaneous) Calcination Anisotropy QD1-999 010302 applied physics Strontium Process Chemistry and Technology Chemical technology automobile 021001 nanoscience & nanotechnology magnet cobalt motor Chemistry chemistry Sintered magnets Magnet Ferrite (magnet) additives 0210 nano-technology Cobalt Stoichiometry |
| Zdroj: | Processes Volume 9 Issue 6 Processes, Vol 9, Iss 1034, p 1034 (2021) |
| ISSN: | 2227-9717 |
| DOI: | 10.3390/pr9061034 |
| Popis: | In this work, an experiment was carried out to investigate the preparation condition of anisotropic, Fe-deficient, M-type Sr ferrite with optimum magnetic and physical properties by changing experimental parameters, such as the La substitution amount and little additive modification during fine milling process. The compositions of the calcined ferrites were chosen according to the stoichiometry LaxSr1-xFe12-2xO19, where M-type single-phase calcined powder was synthesized with a composition of x = 0.30. The effect of CaCO3, SiO2, and Co3O4 inter-additives on the Sr ferrite was also discussed in order to obtain low-temperature sintered magnets. The magnetic properties of Br = 4608 Gauss, bHc = 3650 Oe, iHc = 3765 Oe, and (BH)max = 5.23 MGOe were obtained for Sr ferrite hard magnets with low cobalt content at 1.7 wt%, which will eventually be used as high-end permanent magnets for the high-efficiency motor application in automobiles with Br > 4600 ± 50 G and iHc > 3600 ± 50 Oe. |
| Databáze: | OpenAIRE |
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