Hybrid Nd-Fe-B/barium ferrite magnetic materials with epoxy matrix

Abstract

Lately a great attention has been paid to the research of bonded hybrid composites with improved dynamic mechanical capacities capable of replacing bonded Nd-Fe-B magnetic materials, by using the cheaper (ferrite) materials instead of the Nd-Fe-B powder while retaining the satisfying values of the maximal magnetic energy. The objective of this study is to assess how different contents of Nd-Fe-B and/or barium ferrite particles can affect morphological, dynamic mechanical and magnetic properties of bonded composite materials. The interactions between employed magnetic powders and the interactions between magnetic powders and polymer binder are considered. For the examination of the magnetic behaviour, a vibrating sample magnetometer (VSM) is used. Different shapes and sizes of the obtained hysteresis loops are used for comparison and prediction of the polymer bonded materials properties. The homogeneous distribution of the magnetic particles in the polymer matrix is validated using the scanning electron microscope (SEM). The elastic and damping behaviour examined by the dynamic mechanical analysis (DMA) show improved properties for hybrid composite materials

Magnetic behaviour of hybrid magnetic composite materials

“…However, spherical barium ferrite agglomerates contribute to the higher values of storage modulus i.e. higher stiffness of materials [6,7].…”

Preparation and Characterization of Hybrid Bonded Magnet Ba-Ferrite/NdFeB with Epoxy Resin

“…Moreover, higher Hc value in the hybrid bonded magnet Ba-Ferrite/NdFeB generates higher resistency in demagnetization. The magnetic particle NdFeB will be protected by Ba-Ferrite particle because Ba-Ferrite particle has good corrosion resistance properties [6]. The SEM result of the hybrid bonded magnet with 70% Ba-Ferrite, 30% NdFeB, and 5% ER is shown in Fig.…”

“…The Nd-Fe-B alloy has excellent magnetic properties compared to the ferrite magnet, but the raw material and fabrication cost is also more expensive [5]. The hard magnetic alloys such as Nd-Fe-B and Ba-Ferrite are identified as suitable for research and further development of magnetic composite materials with polymer matrix, so called as bonded magnets [5,6]. There are several different technical approaches for bonded magnet production, and the compression moulding is the most common technique utilized for materials with thermosetting polymer matrices [7,8].…”

Komposit Magnet Permanen Berbasis NdFeB –Epoxy Resin dan Karakterisasinya

“…Sedangkan bonded magnet NdFeB merupakan jenis magnet yang dibuat dari campuran partikel magnetik NdFeB dengan perekat dari bahan polimer, dan produk ini dikenal dengan nama komposit magnet permanen [5]. Polimer merupakan senyawa organik yang memiliki rantai ikatan yang panjang, contoh polimer yang sering digunakan pada pembuatan komposit magnet antara lain : Nylon, rubber, epoksi resin atau jenis-jenis plastik termosetting [5,6].…”

“…Dari grafik diatas dapat dilihat bahwa semakin banyak penambahan komposisi epoksi resin maka akan cenderung menurun nilai densitas nya. Hal ini dikarenakan adanya perbedaan densitas antara polimer epoksi resin dengan partikel magnetik, dimana densitas epoxy resin sekitar 1,5 g/cm 3 sedangkan densitas serbuk magnetik sekitar 6 -7 g/cm 3 [6,7].…”