Several major factors affecting the strong magnetic demagnetization (degaussing) of NdFeB
Release time:
2021-11-12
Strong magnets generally refer to NdFeB magnets, which are mainly composed of rare earth praseodymium neodymium and common element iron alloy. At present, this material is widely used in the market, but strong magnets often encounter weakening or disappearance of magnetic force in the process of use. It often happens that we summarize the reasons for magnet demagnetization:
Strong magnets generally refer to NdFeB magnets, which are mainly composed of rare earth praseodymium neodymium and common element iron alloy. At present, this material is widely used in the market, but strong magnets often encounter weakening or disappearance of magnetic force in the process of use. It often happens that we summarize the reasons for magnet demagnetization:
1: Magnetization or degaussing after magnet injection molding. The minimum temperature resistance of NdFeB N series is 80 ℃, while sometimes injection molding is basically above 120 ℃, so short injection molding of 2 seconds to 3 seconds may cause partial demagnetization imagination.
2: magnet degaussing after hot pressing, often using glass fiber plate hot pressing, temperature above 150 ℃.
3: magnet demagnetization after oven baking.
4: magnet material contains too much impurities lead to weak magnetic. This is the common result of most greedy buyers. Because the quotation is more than three, pick the manufacturer with the lower quotation. Clearly, the customer's request is to use the N35 brand, the results of the low price of the bad manufacturers on the use of N28, N33 materials, customers do not expect to be able to detect, if the amount of 30K, do you use a magnetic flux meter to slowly measure it? (short 6 months to appear demagnetization, fast two months to appear demagnetization), a reliable and stable supplier is really important. How can you use N35 materials to make it for you without that price? And some merchants use magnets for packaging. Anyway, it's okay to suck, and the materials are rubbish.
5: the impact of the magnet results in demagnetization, such as high frequency impact, in the process of transportation to be particularly careful.
7: High magnetic field environment test magnet itself magnet force disappears or N/S pole changes (magnetizing machine demagnetizing machine).
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