Ferrite Permanent Magnets 20161222
Ferrite Permanent Magnets 20161222
Factors of High-performance Dry-press Anisotropic Ferrite Magnets
Generally, the performance of dry-press anisotropic ferrite magnets mostly depends on the quality of raw powder and the relevant magnetic field molding technology. Compared with the traditional wet-pressing process, there are additional two procedures of dry-pressing, namely, drying and dispersing, which are also the key processes of manufacturing. Below are some other specific factors of dry-pressing anisotropic ferrite.
Manufacturing of Dry-pressed Powder
As is well-known, the most important technical parameter of permanent ferrite magnets is Br. In order to improve Br, it is necessary to achieve high density and orientation degree with certain recipes. And as the lack of flowing media in the dry powder, it is relatively hard to reach high orientation degree. Thus, some organic additives, like camphor and calcium stearate, are added as binders and lubricants. On the other hand, it is also available to change the particle size distribution and the particle morphology. As proved, the sanding particles are easier to rotate and thus achieve higher orientation degree instead of ball-milling.
Magnetic Field Molding Technology
To acquire high-performance dry-press anisotropic ferrite, a strong permanent magnet field is also necessary besides superior dry powder. To wet-press products, it requires higher magnetic field when the particles in the slurry is smaller. And to the dry-press, there are some large sample will crack in the molding and sintering process. And the main reason is the lack of flowing media that mentioned above. Thus, to adjust the adding mode and amounts of organic additives and to advance the sintering technology are good solutions for reduce cracking and improve magnetic field.
All in all, ferrite magnets manufacturers can adjust these factors accordingly to achieve good properties of high-performance dry-press anisotropic ferrite. If you have such demand, welcome to contact China Rare Earth Magnet Limited.
Factors of High-performance Dry-press Anisotropic Ferrite Magnets
Generally, the performance of dry-press anisotropic ferrite magnets mostly depends on the quality of raw powder and the relevant magnetic field molding technology. Compared with the traditional wet-pressing process, there are additional two procedures of dry-pressing, namely, drying and dispersing, which are also the key processes of manufacturing. Below are some other specific factors of dry-pressing anisotropic ferrite.
Raw Materials and Recipes
Commonly, the raw materials and recipes of high-performance dry-pressing anisotropic ferrite permanent magnets are similar with the wet-pressing products, which can be used to make dry-pressed powder directly. Before making, Physical and Chemical Analysis should be carried on the raw materials Fe2O3 and SrCO3, and then adjust proportioning properly according to the amount of intrinsic contaminant. Manufacturing of Dry-pressed Powder
As is well-known, the most important technical parameter of permanent ferrite magnets is Br. In order to improve Br, it is necessary to achieve high density and orientation degree with certain recipes. And as the lack of flowing media in the dry powder, it is relatively hard to reach high orientation degree. Thus, some organic additives, like camphor and calcium stearate, are added as binders and lubricants. On the other hand, it is also available to change the particle size distribution and the particle morphology. As proved, the sanding particles are easier to rotate and thus achieve higher orientation degree instead of ball-milling.
Magnetic Field Molding Technology
To acquire high-performance dry-press anisotropic ferrite, a strong permanent magnet field is also necessary besides superior dry powder. To wet-press products, it requires higher magnetic field when the particles in the slurry is smaller. And to the dry-press, there are some large sample will crack in the molding and sintering process. And the main reason is the lack of flowing media that mentioned above. Thus, to adjust the adding mode and amounts of organic additives and to advance the sintering technology are good solutions for reduce cracking and improve magnetic field.
All in all, ferrite magnets manufacturers can adjust these factors accordingly to achieve good properties of high-performance dry-press anisotropic ferrite. If you have such demand, welcome to contact China Rare Earth Magnet Limited.
