永久磁铁、铸造磁铁由于其价格低廉,广泛应用于重型电机,家用电器,电子仪器等方面。近年来,随着仪器的小型化、精密化、专业化、高磁力的钐钴合金磁铁正在发展。但是,由于这种磁铁较脆,需经二次加工,推广使用受到影响。磁性橡胶主要用在电冰箱门封、文具等方面,由于其磁性较弱,用途也有限。最近,高性能铁淦氧类磁性塑料和稀土类磁性塑料已经出现,使以前被认为是不可能的许多新用途得以开发,且可望在今后得到迅速发展。在磁性塑料中,塑料作为联结体,由于其本身 Permanent magnet, casting magnet because of its low price, widely used in heavy duty motor, household appliances, electronic equipment and so on. In recent years, with the miniaturization of instruments, precision, specialization, and high magnetic samarium-cobalt alloy magnets are being developed. However, due to the brittleness of such magnets, secondary processing is required and the promotion and use are affected. Magnetic rubber is mainly used in refrigerator door seals, stationery, etc., due to its weak magnetic properties, uses are limited. Recently, high-performance ferrite magnetic plastics and rare earth magnetic plastics have emerged that have allowed the development of many new uses that were previously considered impractical and are expected to grow rapidly in the future. In magnetic plastics, plastic works as a coupling body due to itself