Dry-pressing VS Wet-pressing Ferrite Magnets 20161220
Dry-pressing VS Wet-pressing Ferrite Magnets 20161220
Ferrite Permanent Magnets Manufacturer China Rare Earth Magnet Limited
Ferrite magnet is a kind of permanent magnet that mainly consists of Fe2O3 and SrO or BaO materials. Compared with other permanent magnets like NdFeB magnets or SmCo magnets, ferrite is hard and brittle with relatively lower magnetic properties. However, it can’t be demagnetized easily and has strong anti-corrosion ability, what’s more, the production process of ferrite magnets is simple and the price is also cheap. Thus, of all permanent magnets, ferrite has the highest outputs and is widely used in many industries. According to different manufacturing methods of magnetic powders, there are mainly two ways to produce ferrite, separately, dry-pressing and wet-pressing.
Generally speaking, with positive chemical activity of the raw materials, the wet-pressing products have higher and more stable magnetic properties, and it is also easier to determine magnetized orientation during pressing process. Nevertheless, the rejection rate of roughcast products is high too as it is hard to control dehydration. And some complicated shape even can’t be manufactured by wet-pressing method. In addition, the molding process of wet-pressing is sophisticated, therefore, the molding speed is slow with 1 to 2 times per minutes, but the speed of dry-pressing is 15 to 20 times per minutes.
On contrast, the dry-pressing methods mainly use oxide with somewhat lower chemical activity as raw materials, so it can’t achieve complete chemical reactions generally. And as there are no flow media during dry-pressing, it is hard to reach high orientation degree. But as there is no need to dehydration in dry-pressing, the molding equipment of it is consequently simple, which is easy to achieve automation. Furthermore, the finished surface of dry-pressed product is smooth and flat without the need of trimming, thus reducing workload of grinding greatly. Taken together, dry-pressing is pretty suitable for producing ferrite of abnormal shape and small shape.
Ferrite Permanent Magnets Manufacturer China Rare Earth Magnet Limited
Ferrite magnet is a kind of permanent magnet that mainly consists of Fe2O3 and SrO or BaO materials. Compared with other permanent magnets like NdFeB magnets or SmCo magnets, ferrite is hard and brittle with relatively lower magnetic properties. However, it can’t be demagnetized easily and has strong anti-corrosion ability, what’s more, the production process of ferrite magnets is simple and the price is also cheap. Thus, of all permanent magnets, ferrite has the highest outputs and is widely used in many industries. According to different manufacturing methods of magnetic powders, there are mainly two ways to produce ferrite, separately, dry-pressing and wet-pressing.
Generally speaking, with positive chemical activity of the raw materials, the wet-pressing products have higher and more stable magnetic properties, and it is also easier to determine magnetized orientation during pressing process. Nevertheless, the rejection rate of roughcast products is high too as it is hard to control dehydration. And some complicated shape even can’t be manufactured by wet-pressing method. In addition, the molding process of wet-pressing is sophisticated, therefore, the molding speed is slow with 1 to 2 times per minutes, but the speed of dry-pressing is 15 to 20 times per minutes.
On contrast, the dry-pressing methods mainly use oxide with somewhat lower chemical activity as raw materials, so it can’t achieve complete chemical reactions generally. And as there are no flow media during dry-pressing, it is hard to reach high orientation degree. But as there is no need to dehydration in dry-pressing, the molding equipment of it is consequently simple, which is easy to achieve automation. Furthermore, the finished surface of dry-pressed product is smooth and flat without the need of trimming, thus reducing workload of grinding greatly. Taken together, dry-pressing is pretty suitable for producing ferrite of abnormal shape and small shape.
