Heat Treatment of Amorphous Ribbon
Amorphous alloys have the advantages of high magnetic induction, low coercive force, and low wear and tear, so they are widely used in power transformers due to their high efficiency, energy saving, and environmental protection. However, at the beginning of 2009, almost all the amorphous strips used in amorphous alloy transformers in China's entire industry market were produced by Toyo Hitachi Metals. In 2010, the 10,000-ton amorphous alloy strip production line of China Ping An Science and Technology Enterprise with independent intellectual property rights was constructed and put into production, which broke through the passive situation of relying on imports of amorphous raw materials and accelerated the development of low-carbon economy in China's power industry.
So far, the amorphous alloy core has adopted a nearly rectangular overlapping winding structure. The external stress of the formed core is very large, and the magnetic properties are seriously damaged. These stresses must be eliminated by heat treatment and annealing. Heat treatment and annealing process The most critical and difficult process in the whole manufacturing process of curved straight crystal alloy core. The horizontal direction of the domestic amorphous alloy strip is arc-shaped, and its external stress is greater than that of the imported strip. In addition, the composition is different, and it is more sensitive to the temperature during heat treatment. Because of this, the formulation Appropriate heat treatment and annealing process is crucial to the final iron properties and quality of domestic amorphous alloy strips.
1. Heat treatment annealing temperature. An appropriate core annealing temperature not only ensures the elimination of the external stress of the core and restores its special magnetic properties, but also minimizes the brittleness of the amorphous alloy strip and reduces the risk of breaking the core during subsequent operations. Experiments have shown that it is better to control the annealing temperature after Z of the domestic amorphous alloy strip core at 375-380°C.
Second, heat treatment warming time. Experiments show that the unit excitation power decreases with the prolongation of the annealing time, and the unit no-load damage of the core increases with the prolongation of the annealing time, and the brittleness of the core strip also increases with the prolongation of the annealing time. Because of this, it is necessary to choose the best warm-keeping time according to the user's requirements for iron performance.
Three, heat treatment to take care of the atmosphere. The iron core is easily oxidized by oxygen during high temperature heat treatment and annealing. After the surface of the iron core is oxidized by oxygen, in addition to the rust on the surface, the more important thing is that the no-load damage of the iron core will increase superficially. Because of this, the iron core must be properly taken care of during the entire heat treatment and annealing process. The usual processes up to now have taken care of the gas as nitrogen or argon.
4. Increase and decrease temperature speed. Because iron cores are multi-loaded and batch heat-treated during mass production, reasonable heating and cooling speeds not only affect the performance and final results of amorphous alloy cores, but also affect production speed and production costs. Generally speaking, the faster the temperature rises, the greater the dispersion. However, experiments have shown that the temperature dispersion of the domestic amorphous alloy strip core is relatively small when it reaches the high temperature zone and is close to the annealing temperature point, which can be controlled within 3°C. Therefore, in the stage of temperature rise, the domestic amorphous alloy strip core can directly implement rapid temperature rise. In addition, the fast temperature reduction is good for reducing the no-load loss of the iron core, but it is the same as the special case of increasing the excitation power of the iron core. Therefore, reducing the temperature speed needs to accumulate empirical values for selection.
5. Applied magnetic force field. The formed amorphous alloy core needs to be annealed with a DC magnetic field to obtain a satisfactory magnetic domain orientation, so as to improve its magnetic properties. Experiments have shown that: the field strength of the domestic amorphous alloy strip core annealing needs to be about 2000A/m or the magnetic field current volume is 1400A, which can ensure that the core material reaches the maximum limit during annealing, so that the annealing effect can be achieved.
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