People who don't understand may not know that strong magnets usually refer to NdFeB magnets, which are also called tomatoes and tomatoes. It is mainly composed of rare earth lanthanum and ordinary elemental iron alloy. At present, such raw materials are widely used in the industrial market, but strong magnets often encounter weakening or regressing of magnetic fields during application. Xiaobian summarizes magnet demagnetization. The main factors:
Cylindrical strong magnet
1. The strong magnet demagnetizes after injection molding. The temperature resistance of the NdFeB series is 80 °C, and sometimes the injection molding process is based on 120 °C, so the injection molding process of 2-3 seconds in a short time may cause some magnets to demagnetize. phenomenon;
2. After hot pressing, the strong magnet is demagnetized, and the glass fiber board is often used for hot pressing, and the temperature is above 150 °C;
3. The magnet is demagnetized after baking in the oven;
4. The high magnetic field environment makes the magnet itself disappear or the N/S pole changes (for example, the magnetizer demagnetizer).
Large and powerful head magnet
5, the impact of the magnet loss of magnetism, such as high-frequency collisions, etc., in the process of transportation must be very careful;
6, the magnet material contains too much impurities, resulting in a weak magnetic field, which is the common result of most buyers who make small profits, due to price bargaining, pick the low price of the manufacturer. Originally, the customer specified that the N35 grade was used. As a result, the poor manufacturer who used the ultra-low price used N28 and N33 materials, and if it was slow, it demagnetized for 6 months, and if it was fast, it demagnetized for 2 months. In short, it is very important to have a reliable and stable supplier;
Summarize that the powerful magnet loses its magnetic force 90% from the above points.
