1.Amorphous cut core annealing temperature. Appropriate annealing temperature of the core not only ensures the elimination of the internal stress of the core and the restoration of its magnetic properties, but also minimizes the brittleness of amorphous alloy strips and reduces the risk of fragmentation in subsequent operation of the core. The experimental results show that the final annealing temperature of the domestic amorphous alloy strip core is controlled at 375-380 C, which is the best.
2. Amorphous cut core heat treatment holding time. The experimental results show that the unit excitation power decreases with the prolongation of annealing time, while the unit no-load loss of core increases with the prolongation of annealing time, and the brittleness of core strip also increases with the increase of annealing time. Therefore, it is necessary to select the best holding time according to the requirements of users for core performance.
3. Amorphous cut core heat treatment protects atmosphere. Cores are easily oxidized during annealing at high temperature. After the surface of the core is oxidized, besides rust on the surface, the main reason is that the no-load loss of the core increases obviously. Therefore, the core must be protected by atmosphere during the whole annealing process. At present, the commonly used process protective gas is nitrogen or argon.
4. Temperature rise and cooling rate. Because cores are loaded and heat treated in batches during mass production, reasonable heating and cooling rates not only affect the performance of amorphous alloy cores, but also affect production efficiency and production cost. Generally speaking, the faster the heating rate, the greater the dispersion. However, the experimental results show that the temperature dispersion of the domestic amorphous alloy strip core is small when it reaches the high temperature zone and approaches the optimum annealing temperature point, which can be almost controlled within 3 C. Therefore, in the heating stage, the domestic amorphous alloy strip core can be directly heated rapidly. In addition, the cooling speed is fast, which is beneficial to reduce the no-load loss of the core, but at the same time it will increase the excitation power of the core. Therefore, the best cooling rate needs to accumulate empirical data for the best choice.
5. External magnetic field. In order to improve the magnetic properties of amorphous alloy cores after annealing, it is necessary to add DC magnetic field to obtain good domain orientation. The test results show that the annealing field strength of the domestic amorphous alloy strip core needs about 2000 A/m or the magnetic field current is about 1400 A to ensure the saturation of the core material during annealing, so as to achieve the best annealing effect.
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