Development of Mischmetal-(FeCo)-B Ribbons with Improved Magnetic Properties by Addition of Si
In order to develop mischmetal-based permanent magnets with a high performance/cost ratio, Si addition was employed to enhance the magnetic performance of the MM<sub>16</sub>Fe<sub>76-x</sub>Co<sub>2</sub>Si<sub>x</sub>B<sub>6</sub> (x = 0–...
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| Format: | Article |
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MDPI AG
2023-12-01
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| Series: | Metals |
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| Online Access: | https://www.mdpi.com/2075-4701/14/1/8 |
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| author | Marian Grigoras Mihaela Lostun Gabriel Ababei Marieta Porcescu George Stoian Nicoleta Lupu |
| author_facet | Marian Grigoras Mihaela Lostun Gabriel Ababei Marieta Porcescu George Stoian Nicoleta Lupu |
| author_sort | Marian Grigoras |
| collection | DOAJ |
| description | In order to develop mischmetal-based permanent magnets with a high performance/cost ratio, Si addition was employed to enhance the magnetic performance of the MM<sub>16</sub>Fe<sub>76-x</sub>Co<sub>2</sub>Si<sub>x</sub>B<sub>6</sub> (x = 0–1.5%) ribbons. The ribbons were manufactured by a melt-spinning technique at different velocities. Samples were studied in an as-cast state and after annealing. It was found that the addition of Si in the MM<sub>16</sub>Fe<sub>76-x</sub>Co<sub>2</sub>Si<sub>x</sub>B<sub>6</sub> ribbons increased the exchange interaction between Fe atoms in the 2:14:1 phase, reduced the crystal grain size, and increased the exchange coupling between the crystal grains; as a result, the magnetic properties were improved. The coercivity and Curie temperature increased with the increasing Si content from x = 0 to x = 1.5 at%, while the remanence and energy product increased with the addition of Si up to 1% and decreased with further Si addition. The best combination of magnetic properties, such as coercivity of H<sub>c</sub> = 8.9 kOe, remanence Mr = 98 emu/g, Curie temperature T<sub>c</sub> = 257 °C, and energy product (BH)<sub>max</sub> = 13.84 MGOe, were obtained in ribbons with 1.0 at. % Si. Thus, it is demonstrated that the addition of Si leads to an improvement of the magnetic properties of MM<sub>16</sub>Fe<sub>76-x</sub>Co<sub>2</sub>Si<sub>x</sub>B<sub>6</sub> ribbons, making them good candidates as precursors for the preparation of permanent magnets with an energy product between that of ferrites and Nd-Fe-B magnets. |
| first_indexed | 2024-03-08T10:41:51Z |
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| id | doaj.art-f520d914eb93487592da6b786df36016 |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-08T10:41:51Z |
| publishDate | 2023-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Metals |
| spelling | doaj.art-f520d914eb93487592da6b786df360162024-01-26T17:39:31ZengMDPI AGMetals2075-47012023-12-01141810.3390/met14010008Development of Mischmetal-(FeCo)-B Ribbons with Improved Magnetic Properties by Addition of SiMarian Grigoras0Mihaela Lostun1Gabriel Ababei2Marieta Porcescu3George Stoian4Nicoleta Lupu5National Institute of Research and Development for Technical Physics, 47 Mangeron Blvd., 7000500 Iasi, RomaniaNational Institute of Research and Development for Technical Physics, 47 Mangeron Blvd., 7000500 Iasi, RomaniaNational Institute of Research and Development for Technical Physics, 47 Mangeron Blvd., 7000500 Iasi, RomaniaNational Institute of Research and Development for Technical Physics, 47 Mangeron Blvd., 7000500 Iasi, RomaniaNational Institute of Research and Development for Technical Physics, 47 Mangeron Blvd., 7000500 Iasi, RomaniaNational Institute of Research and Development for Technical Physics, 47 Mangeron Blvd., 7000500 Iasi, RomaniaIn order to develop mischmetal-based permanent magnets with a high performance/cost ratio, Si addition was employed to enhance the magnetic performance of the MM<sub>16</sub>Fe<sub>76-x</sub>Co<sub>2</sub>Si<sub>x</sub>B<sub>6</sub> (x = 0–1.5%) ribbons. The ribbons were manufactured by a melt-spinning technique at different velocities. Samples were studied in an as-cast state and after annealing. It was found that the addition of Si in the MM<sub>16</sub>Fe<sub>76-x</sub>Co<sub>2</sub>Si<sub>x</sub>B<sub>6</sub> ribbons increased the exchange interaction between Fe atoms in the 2:14:1 phase, reduced the crystal grain size, and increased the exchange coupling between the crystal grains; as a result, the magnetic properties were improved. The coercivity and Curie temperature increased with the increasing Si content from x = 0 to x = 1.5 at%, while the remanence and energy product increased with the addition of Si up to 1% and decreased with further Si addition. The best combination of magnetic properties, such as coercivity of H<sub>c</sub> = 8.9 kOe, remanence Mr = 98 emu/g, Curie temperature T<sub>c</sub> = 257 °C, and energy product (BH)<sub>max</sub> = 13.84 MGOe, were obtained in ribbons with 1.0 at. % Si. Thus, it is demonstrated that the addition of Si leads to an improvement of the magnetic properties of MM<sub>16</sub>Fe<sub>76-x</sub>Co<sub>2</sub>Si<sub>x</sub>B<sub>6</sub> ribbons, making them good candidates as precursors for the preparation of permanent magnets with an energy product between that of ferrites and Nd-Fe-B magnets.https://www.mdpi.com/2075-4701/14/1/8magnetic propertiesmischmetalmelt-spun ribbonsSi addition |
| spellingShingle | Marian Grigoras Mihaela Lostun Gabriel Ababei Marieta Porcescu George Stoian Nicoleta Lupu Development of Mischmetal-(FeCo)-B Ribbons with Improved Magnetic Properties by Addition of Si Metals magnetic properties mischmetal melt-spun ribbons Si addition |
| title | Development of Mischmetal-(FeCo)-B Ribbons with Improved Magnetic Properties by Addition of Si |
| title_full | Development of Mischmetal-(FeCo)-B Ribbons with Improved Magnetic Properties by Addition of Si |
| title_fullStr | Development of Mischmetal-(FeCo)-B Ribbons with Improved Magnetic Properties by Addition of Si |
| title_full_unstemmed | Development of Mischmetal-(FeCo)-B Ribbons with Improved Magnetic Properties by Addition of Si |
| title_short | Development of Mischmetal-(FeCo)-B Ribbons with Improved Magnetic Properties by Addition of Si |
| title_sort | development of mischmetal feco b ribbons with improved magnetic properties by addition of si |
| topic | magnetic properties mischmetal melt-spun ribbons Si addition |
| url | https://www.mdpi.com/2075-4701/14/1/8 |
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