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A major breakthrough has been made in China's magnesium-zirconium master alloy MgZr

April 26,2023

Magnesium alloys  are alloys composed of magnesium and other elements. Its characteristics are: low density, high specific strength, large specific elastic modulus, good heat dissipation, good shock absorption, greater impact load capacity than aluminum alloy, and good resistance to organic and alkali corrosion. Magnesium-aluminum alloys are currently the most widely used, followed by magnesium-manganese alloys and magnesium-zinc-zirconium alloys. Since magnesium alloy is the lightest metal among practical metals, it is widely used in industrial fields such as automobiles, medicine, aerospace, and chemical industry.

In 2023, Changsha TIJO Metal Materials Co., Ltd. and a technology research center successfully completed the magnesium alloy low-pressure casting experiment, and finally successfully trial-produced the magnesium alloy material, which is used for the control arm sample of auto parts and the chassis of the car. Due to the transformation and upgrading of my country's automobile industry and 3C industry, the application of magnesium alloy will be very broad, and the market of magnesium alloy industry is optimistic. The automotive industry, especially the development of new energy vehicles, requires lightweight and environmental protection, as well as the continuous progress of magnesium alloy research and development technology and recycling technology, which will promote the wider application of magnesium alloys. The Magnesium Alloy Industry Research Group of Qianzhan Industry Research Institute predicts that due to the good prospects of the automobile market and the development of pharmaceutical, chemical, aerospace and other markets, the global magnesium alloy market will reach 6 million tons by 2015, with a compound annual growth rate (CAGR) of 20%. —25% (application of magnesium-containing alloys in transportation, 3C, aerospace, pharmaceutical and chemical industries). As a capital and material-intensive industry, magnesium alloy has low and relatively stable raw material prices. The integration concentration of the foundry industry and the advancement of R&D technology will promote the development of the magnesium alloy industry.

The research and application of magnesium-zirconium master alloy abroad is earlier, and the main production enterprises are concentrated in the United States, Germany, Japan and Australia.

The American Magnesium Electronics Company (MEL) used molten magnesium to chemically reduce chromium-zirconium fluoride to prepare the Mg-Zr master alloy around 1945, and registered it as the Zirmax trademark. Zirmax magnesium-zirconium master alloy contains about 33% zirconium and 67% magnesium (mass fraction). Most zirconium exists in the magnesium matrix in the form of zirconium particles of various sizes (mainly in the submicron to 10μm range). Large-scale application tests have proved that undissolved zirconium particles are easily observed in the microstructure of magnesium alloys prepared using Zirmax magnesium-zirconium master alloys, and the average grain diameter of these residual (undissolved) zirconium particles is about 5 μm, which is Seriously restricts the fine-grain strengthening effect of zirconium on magnesium alloys.

CAST CENTER PTY LTD in Australia directly added the sponge zirconium after de-inert treatment into the magnesium melt, after a long period of continuous stirring, quenching and casting to obtain a magnesium-zirconium master alloy with a zirconium content of 10-50%, of which 90% zirconium The particle size is less than 3 μm and the distribution is uniform. Compared with the application of Zirmax magnesium-zirconium master alloy, it shows better recovery rate and fine grain strengthening effect. It is the best magnesium-zirconium master alloy currently on the market. The company applied for the PCT patent of magnesium-zirconium alloy in 2003.

Magnesium-zirconium master alloys are mainly used as raw materials for smelting zirconium-containing magnesium alloys;

The structure of Mg-Zr alloy is magnesium solid solution and a small amount of fine Zr crystals distributed in magnesium grains. At present, the commercial application of Mg-Zr alloy is only the cast magnesium alloy of K1A brand, which is mainly used in the cast state and has excellent damping performance;

At present, there are 9 standards for magnesium alloy materials in my country, with a total of 44 series and 141 grades. 46 grades of 17 series of magnesium alloys containing zirconium (32 grades of 11 series of cast magnesium alloys, 14 grades of 6 series of deformed magnesium alloys); 39 grades of 14 series of magnesium alloys containing zirconium and rare earths (29 grades of 9 series of cast magnesium alloys, 5 series and 10 grades), accounting for about 1/3 of the total grades of magnesium alloys;

ZM, WE, VW, QE and other zirconium-containing high-strength heat-resistant rare earth magnesium alloy materials account for more than 90% of the rare earth magnesium alloy materials used in the aerospace field. It is expected that with the demand for national defense construction and lightweight equipment, the demand for rare earth magnesium alloy materials will increase sharply at a rate of more than 20%, which will also drive the demand for magnesium-zirconium master alloys in the aerospace field. field at a faster pace. Rapid growth. At the same time, with the concept of green development, energy saving and emission reduction deeply rooted in the hearts of the people, the development of new energy vehicles, rail transit and other fields has also entered the fast lane, which will further drive the demand for zirconium-containing magnesium alloys in the civilian field, mainly ZK series. Dramatic increase.

Magnesium-zirconium master alloys we provide;

1. The surface of the product is smooth, free of molten salt inclusions, less precipitation and slagging;

2. The segregation of zirconium components is small, the metallurgical quality of the prepared magnesium alloy is good, and the effective utilization rate of zirconium is high;

3. More than 90% of the zirconium particles in the alloy have a particle size of ≤3μm and are evenly distributed. The zirconium particles are small, and the fine-grain strengthening effect is good;

4. Low melting temperature, low environmental pollution and high production efficiency;

5. Solve the problems existing in the traditional preparation process (magnesia thermal reduction method), such as too large zirconium particles, uneven overall distribution of zirconium, poor grain refinement effect, and serious environmental pollution;

6. Using the magnesium-zirconium master alloy provided by TIJO can significantly reduce the dosage and save customers 30-70% of the cost;

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