Electrothermal tube electroplating electromagnetic mechanical composite stirring method

Electrothermal tube electroplating electromagnetic mechanical composite stirring method

Strain activation method

The variable activation method is to continuously cast metal ingots with fine grains in advance, then squeeze and deform the metal ingots, and the deformation amount should be large enough. Finally, the deformed metal ingots are cut into a certain size as needed, and then heated to the solid-liquid zone. During the heating process, recovery and recrystallization occur, causing the crystal particles to refine, and then some grain boundaries to melt, resulting in a semi solid metal slurry where the solid-liquid phases coexist. The metal ingots produced by this method are pure and have a large output, but due to the addition of pre deformation processes, the production cost increases. At the same time, this method can only be used to produce small parts, and its application range is limited.

Electromagnetic mechanical composite stirring method

The author's research group has recently developed electromagnetic mechanical composite stirring technology, and its stirring device is shown in Figure 3. The special stirrer in the figure is a device designed by us to change the flow of semi-solid slurry in the mixing chamber during electromagnetic stirring. It can move up and down vertically in the mixing chamber, allowing the entire semi-solid slurry in the mixing chamber to flow over a wide range. The movement of the special mechanical stirrer is controlled by a motor. Electromagnetic stirring is achieved by the circumferential electromagnetic force generated by three pairs of N and S poles placed opposite each other in the semi solid slurry. The cooling and heating holes on the graphite crucible are used to place cooling and heating tubes. These devices are used to accurately control the temperature of the semi-solid slurry, in order to obtain a stable solid state slurry. Implement argon protection throughout the entire mixing process to prevent oxidation of the semi-solid slurry and affect its quality. This modified electromagnetic stirring technology is significantly superior to traditional electromagnetic stirring technology. On the one hand, it can effectively avoid alloy composition segregation during stirring, and on the other hand, it can ensure the uniform distribution of primary solid particles. This method has obvious advantages and application prospects in the preparation of semi solid composite material slurry.

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