Time:1/28/2021 3:40:09 AMauthor:source:
Customed permanent magnet manufacturer,iersPermanent magnet magnet manufacturer,Permanent neodymium iron boron magnet supplier in china
Magnets that can maintain their magnetism for a long time are called permanent magnets. Such as natural magnets (magnetite) and artificial magnets (alnico). In addition to permanent magnets, there are electromagnets that require electricity to be magnetic. Permanent magnets are also called hard magnets, which are not easy to lose magnetism and are not easy to be magnetized. However, if the permanent magnet is heated above the Curie temperature, or is located in an environment with high reverse magnetic field strength, its magnetism will also decrease or disappear. Some magnets are brittle and may crack at high temperatures. The maximum operating temperature of alnico magnets exceeds 540 °C (1,000 °F), samarium cobalt magnets and ferrites are about 300 °C (570 °F), neodymium magnets and soft magnets are about 140 °C (280 °F). F), but the actual value will still vary depending on the crystal grain of the material.
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