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永久磁体是一种不需要消耗电能就能够持续地提供磁场的物体.永久磁体是由永磁材料(又称硬磁材料或恒磁材料)做成的.人类生产和利用永磁材料已有几十年的历史.随着科学技术的不断发展,工业生产对永磁材料的需求量迅速地增长,现在永磁材料已成为机电工业的基础材料之一.据不完全统计,全世界永磁材料的总年产量,1964年为1.5万吨,1974年为5.8万吨,1984年为17.5万吨,估计1994年将达到30万吨.
A permanent magnet is an object that can continuously supply a magnetic field without consuming electric energy. Permanent magnets are made of permanent magnetic materials (also known as hard magnetic materials or permanent magnetic materials) Decade of history.With the continuous development of science and technology, industrial production of permanent magnetic materials, the rapid growth in demand, and now permanent magnet materials has become one of the basic materials for the mechanical and electrical industry.According to incomplete statistics, the world’s permanent magnetic materials The total annual output was 15,000 tons in 1964, 58,000 tons in 1974 and 175,000 tons in 1984, with an estimated 300,000 tons in 1994.