"Using magnesium alloy" is the lightest practical metal!

Magnesium alloy is an alloy composed of magnesium and other elements (aluminum, zinc, manganese, cerium and a small amount of zirconium or cadmium). ). Magnesium alloy has a melting point of 650℃ and is a light alloy. Magnesium alloy has low density (about 1.8g/cm3), good electrical and thermal conductivity, large elastic modulus, good shock absorption, easy oxidation and combustion, and good corrosion resistance, especially for organic matter and alkali. So what are the uses of magnesium alloys?

How should magnesium alloys be used? Because magnesium alloys are very light, they are mostly used in aviation, aerospace, transportation, chemical industry, rockets and other industrial sectors. Its density is a quarter of that of iron, and its specific gravity is about two-thirds of that of aluminum. It is the lightest of practical metals.

Application of magnesium alloy: application in automobile

Magnesium alloys are used in automobiles because of their high density and easy extension. Magnesium alloy must be used in automobile lightweight technology. Magnesium alloy plays an important role in automobile manufacturing, which can optimize the design structure of automobile, reduce the role of automobile itself, and be beneficial to automobile energy saving, emission reduction, safety, cost and many other aspects. Large-scale integrated development of automobile equipment such as dashboard frame, seat frame, intake manifold, racing wheel, bracket, steering wheel frame, cylinder block and shell parts. It not only meets the needs of consumers, but also meets the call for environmental protection, energy saving and emission reduction of magnesium alloy parts.

Application of magnesium alloy: application in digital SLR camera

Magnesium alloy is often used as the skeleton of SLR cameras because of its low density, high strength and certain corrosion resistance. Generally, high-end and professional digital SLR cameras will use magnesium alloy as the skeleton, and the skeleton made is durable and feels very good. For example, 5D series, Nikon D3 series, Canon 1D series, D700, Dx00 series and the latest D70007D and 10D-50D, Pentax K-7 and K-5 are all made of magnesium alloys.

Application of magnesium alloy: application in aerospace

Magnesium alloys play an indispensable role in aerospace and are widely used. Magnesium alloy is used in aerospace field because of its high density, light weight and easy extension, which can reduce the load on various aerospace vehicles, further reduce the fuel load of aircraft, reduce the overall weight of aircraft and make the aircraft fly farther.

fire prevention

Fire hazard in magnesium alloy cutting process

Magnesium chips are active and easy to burn at high temperature. In the process of magnesium alloy cutting, magnesium chips are mostly unoxidized magnesium and magnesium alloys. Because magnesium metal is a first-class flammable material when wet, its ignition point and minimum ignition energy are low, and the chip is thin and small, with large specific surface area, which is easy to burn at high temperature in air.

High temperature will be generated during high-speed cutting, which will ignite magnesium chips. In machining, in order to give full play to the cutting performance of tools and improve production efficiency and workpiece quality, higher cutting speed is generally required. However, high-speed cutting often makes the temperature of metal chips as high as 700°C ~? 1? 000°C, when there is no effective coolant supply, the high temperature will be enough to ignite the fire of magnesium chips.

The burning temperature of magnesium chips is high, the fire spreads quickly and it is difficult to put out the fire. Once a fire happens to magnesium, its combustion temperature can reach 3? 000°C, and the combustion heat value is as high as 25? 12 1? KJ/kg. When magnesium chips are in powder form, they will explode when mixed with air in case of fire. In addition, because magnesium can react with water to release hydrogen at high temperature, water, foam, carbon tetrachloride and other extinguishing agents are all limited in magnesium metal fire, and dry powder and halon extinguishing agents have no obvious extinguishing effect, so it is difficult to put out.

Fire extinguishing of magnesium chips

Water, foam, carbon tetrachloride and carbon dioxide fire extinguishing agents are strictly prohibited.

For the burnt magnesium scrap, a D-class fire extinguisher should be used. Such as 7 150, d-type dry powder, dry sand, etc. Considering that 7 150 and D dry powder fire extinguishers are not common in the domestic market at present, and dry sand does great harm to machine tools (especially precision machine tools), 750 can be selected from local materials. %~80? % covering flux powder plus 20? %~25? % sulfur powder was mixed to make powder spraying flux, which was put into portable dry powder fire extinguisher to put out the fire, and the effect was obvious.

When putting out the magnesium chip fire, the nozzle of the fire extinguisher should keep a certain distance from the burning magnesium chip, so as to minimize the impact of the fire extinguisher on the magnesium chip during spraying and prevent the magnesium chip from spreading to form an explosive mixture.

Magnesium alloy products are widely used in all aspects of our daily life. There are many kinds of magnesium alloys on the market, which can be used for us to choose the right magnesium alloy and is one of the most useful alloys. I hope this article can help you introduce the uses of magnesium alloys.