Neodymium iron boron magnets are usually called simple neodymium iron boron magnets, through the extensive process of using rare earth metals, they are usually the most powerful. However, because they are made of iron, they will rust in a humid environment or when exposed to water for a long time, which also makes them more brittle than other types. Neodymium iron boron magnets are used in power tool applications. From spinning DVD disc motors, neodymium magnets are widely used in the automotive industry. Samarium cobalt magnets or iron boron magnets are usually used as car magnets based on operating temperature and/or corrosion resistance. Sex.
Operating temperature: If low-coercivity neodymium magnets are heated above 176°F (80°C), they may begin to lose their strength. High-coercivity neodymium magnets have developed to temperatures as high as 428°F (220°C) The irreversible loss is very small. The need for low temperature coefficients in neodymium magnet applications has triggered several levels of development to meet specific operating requirements.
Corrosion: NdFeB magnets are easy to corrode, especially along the grain boundaries of sintered magnets. This type of corrosion can cause serious deterioration, including crushing the magnets into small magnetic powders, and adding protective coatings to prevent exposure to the atmosphere. For this loophole, nickel plating or double-layer copper-nickel plating is the standard method, and other metals or polymers and paint protective coatings can also be used for electroplating.
Ferrite magnet or ceramic magnet
Compared with rare earth magnets, although ferrite magnets have lower energy consumption, they have been widely accepted due to their strong demagnetization resistance, strong corrosion resistance, and low price. It is the most commonly used in most types of DC motors. Magnet. They are not as powerful as neodymium, but they are a cost-effective choice for basic crafts, refrigerator magnets, or storage of lightweight items.
Operating temperature: The maximum operating temperature of a ceramic magnet is 250°C. Although it will experience magnetic loss when operating at high temperatures, the loss will recover when the material drops to a normal ambient temperature. Working at very cold temperatures (-20°C) may cause permanent loss of magnetic strength, unless the circuit is designed for this extreme situation.
Corrosion: Ceramic magnets have good corrosion resistance and generally do not require coating or electroplating.
