Magnesium alloy refiner and preparation method thereof

Abstract

The invention discloses a magnesium alloy refiner and a preparation method thereof, and relates to a grain refiner and a preparation method thereof. The method solves the problems that an overheating treatment method of the existing magnesium alloy refining method has strict condition requirement, the oxidation burning loss of magnesium is serous, a carbon-containing material treatment method has high temperature and produces harmful gases such as Cl2, HCl and the like, a ferric chloride method reduces the corrosion resistance of the magnesium alloy, an alloying method has high cost, a granular graphite or aluminium carbide granule method is easy to produce segregation on the grain boundary and a Zr element method has narrow application range. The magnesium alloy refiner is prepared from a calcium metal and a primary magnesium ingot. The preparation method comprises the following steps: heating and melting the primary magnesium ingot under atmospheric protection, then adding the calcium metal into the melted primary magnesium ingot, dissolving the calcium metal and stirring the mixture uniformly, and casting the mixture to form the magnesium alloy refiner. The magnesium alloy refiner has no burning loss, does not produce the harmful gases, has no influence on the corrosion resistance of the magnesium alloy, has low cost, is uniformly distributed in the alloy, can improve the mechanical property of the alloy, and is used for refining the magnesium alloy.

Description

technical field [0001] The invention relates to a grain refiner and a preparation method thereof. Background technique [0002] Because magnesium alloy has high specific strength and specific stiffness, it can be widely used in aerospace, automobile, machinery, electronics, computer and other fields to achieve the purpose of reducing the weight of components. The application of magnesium alloy refiner to refine the magnesium alloy melt is an important means to improve the comprehensive performance of magnesium alloy and improve the formability of magnesium alloy. The grain refinement effect is mainly reflected in the following aspects: ① fine grains help to improve the mechanical properties and plastic deformation ability of the alloy; ② fine grains help to reduce casting defects such as thermal cracking and porosity, thereby The performance of the alloy is improved; in addition, the fine grains also help to improve the corrosion resistance and processing performance of the...

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Problems solved by technology

[0003] The present invention aims to solve the problem that the overheating treatment method of the existing magnesium alloy refinement method requires strict conditions, the oxidation and burning loss of magnesium is relatively serious, the temperature of the carbonaceous material treatment method is high and the generation of Cl 2 , HCI and other harmful gases, the ferric chloride method reduces the corrosion resistance of magnesium alloys, the cost of the alloying method is high, the granular graphite or aluminum carbide particle method is prone to segregation at the grain boundary and the Zr element method has narrow application range. , and provide a magnesium alloy refiner and preparation method thereof

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