Greener processing of SrFe12O19 ceramic permanent magnets by two-step sintering
| Autor: | J. C. Guzmán-Mínguez, Julio F. Fernández, V. Fuertes, Adrián Quesada, Cecilia Granados-Miralles |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Process Chemistry and Technology Metallurgy Sintering Thermal treatment Energy consumption Coercivity Surfaces Coatings and Films Electronic Optical and Magnetic Materials visual_art Magnet Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Ferrite (magnet) Relative density Ceramic |
| Zdroj: | Ceramics International. 47:31765-31771 |
| ISSN: | 0272-8842 |
| DOI: | 10.1016/j.ceramint.2021.08.058 |
| Popis: | With an annual production amounting to 800 kilotons, ferrite magnets constitute the largest family of permanent magnets in volume, a demand that will only increase as a consequence of the rare-earth crisis. With the global goal of building a climate-resilient future, strategies towards a greener manufacturing of ferrite magnets are of great interest. A new ceramic processing route for obtaining dense Sr-ferrite sintered magnets is presented here. Instead of the usual sintering process employed nowadays in ferrite magnet manufacturing that demands long dwell times, a shorter two-step sintering is designed to densify the ferrite ceramics. As a result of these processes, dense SrFe12O19 ceramic magnets with properties comparable to state-of-the-art ferrite magnets are obtained. In particular, the SrFe12O19 magnet containing 0.2% PVA and 0.6% wt SiO2 reaches a coercivity of 164 kA/m along with a 93% relative density. A reduction of 31% in energy consumption is achieved in the thermal treatment with respect to conventional sintering, which could lead to energy savings for the industry of the order of 7.109 kWh per year. |
| Databáze: | OpenAIRE |
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