Magnesium alloy refining agent concurrently having fining and refining action and its use method

Abstract

The invention proposes a magnesium alloy refiner capable of efficiently refining magnesium alloys and simultaneously having a refining effect and a use method thereof. The composition weight percentage of the refiner is 10-50% graphite powder, 20-40% strontium carbonate SrCO3, 10-30% cerium fluoride CeF, 1-10% powdered titanium carbide TiC, 5-10% hexachloroethylene Alkane C2Cl6. The above-mentioned raw materials are firstly heated to remove water, weighed according to weight percentage, mixed evenly, then pressurized and molded, and sealed for use. The use process is as follows: under the melting conditions of flux or gas protection, the magnesium alloy is melted in the crucible, and then the temperature is raised to 700-720°C, and then the slag is removed, and then the preheated 1-1% of the weight of the alloy charge is between 730-750°C. 10% refining agent is quickly pressed into the alloy liquid with a bell jar for 10-15 minutes of refining and refining treatment; after the treatment, it is left to stand for 5-10 minutes to obtain a magnesium alloy melt with good refining effect. The refining agent provided by the present invention has significant advantages. The refining agent integrates the refining treatment and refining treatment of magnesium alloys, simplifies the melt treatment process of magnesium alloys, and reduces costs. Practice has proved that it has a very good refining and refining effect and improves the performance of the alloy.

Description

Technical field: [0001] The invention relates to a magnesium alloy refiner. technical background: [0002] In modern society, energy and environmental issues have increasingly become the focus of attention. In order to reduce energy consumption and reduce environmental pollution caused by automobile exhaust, the lightweight of automobiles has become one of the goals pursued by the world's major automobile manufacturers. As the lightest engineering structural material, magnesium alloy is especially suitable for automobiles, Motorcycles and other means of transportation and applications in the fields of computers, communications, instrumentation, and military, are known as "green structural materials" in the 21st century. Since the 1990s, the application of magnesium alloys in the world's automobile industry has been increasing at a rate of about 20% per year. However, the mechanical properties of existing magnesium alloys at home and abroad are still difficult to meet the c...

AI Technical Summary

Problems solved by technology

However, the above methods have different problems and their applications are limited to varying degrees.

For example, the melt superheating method needs to heat the magnesium alloy melt to a high temperature, which increases the oxidation loss and gas absorption of the magnesium alloy melt, increases the consumption of energy and crucible, and because the density of impurities and melt alloy decreases Small, not conducive to the separation of impurities

In addition, the increase of iron content will greatly reduce the corrosion resistance of the alloy

The melt stirring method has problems such as inconvenient process or complicated operation; adding carbon-containing substances or introducing carbon-containing gas into the aluminum-magnesium alloy requires more than 0.5% aluminum in the alloy to achieve effective refinement

In addition, zirconium is not suitable for most magnesium alloys except Mg-Zn-(Y) due to the reaction of zirconium with alloying elements such as aluminum in the magnesium alloy, and the addition of calcium will easily lead to the alloy in the Hot crack defects occur during casting

It is precisely because of the above-mentioned problems that the application of these magnesium alloy refinement methods mentioned above has been limited to a certain extent, thus affecting the large-scale application of magnesium alloys.