Preparation method of semi-solid slurry

Semi-Solid Metal Processing (SSM) is an advanced metal processing technology between casting and forging. Semi-solid metal is in a solid-liquid coexistence state and has unique rheological properties, which can significantly improve the quality and performance of castings. In the semi-solid molding process, the preparation of semi-solid slurry is very important. This article will take you to understand the main preparation methods of semi-solid slurry.

1. Stirring method
The stirring method is to mechanically stir the liquid metal to form fine solid particles suspended in the liquid phase during the cooling process. The basic principle of this method is to use mechanical stirring to introduce sufficient shear force to stir the metal in a semi-solid temperature range, thereby forming a uniform solid-liquid coexistence phase.

2. Cooling chute method
The semi-solid slurry cooling chute method is a method for preparing aluminum alloy and magnesium alloy billets with non-dendritic structures. The basic principle of this method is to pour molten metal slightly higher than the liquidus temperature onto the cooling chute. On the groove, fine grains are formed on the wall of the inclined groove. Due to the impact of the metal fluid and the self-weight of the material, these grains will fall off the chute wall. By controlling the temperature of the container, the stirring effect can be achieved, so that the metal slurry can be slowly cooled after falling into the container, and then kept warm after cooling to a certain temperature to achieve the required solid phase volume fraction, and then it can be rheformed or thixoformed. shape.

3.Electromagnetic stirring method and electromagnetic stirring method
The strong magnetic field generated by the induction coil, which is parallel or perpendicular to the direction of the mold, or both, is used to form a strong stirring effect on the molten metal between the liquid and solid phase lines, resulting in a violent flow, which causes the metal to solidify and precipitate. The crystals are fully broken and spheroidized to prepare semi-solid slurry or blank.

Zhengheng Dynamics attaches great importance to the development of semi-solid metal forming technology and has launched scientific research cooperation with well-known universities. We recognize that the preparation of semi-solid slurries is key to achieving an efficient, high-quality metal forming process. Through joint research with universities, Zhengheng Dynamics hopes to further improve the quality and production efficiency of semi-solid slurry and promote the innovation and application of semi-solid molding technology. We believe that through close cooperation between industry, academia and research institutes, we can accelerate the maturity and industrialization process of technology, bring higher quality complex-shaped metal castings to the industry, and meet the market demand for high-performance parts.