Aluminum is a light metal. Its compounds are widely distributed in nature. The content of aluminum in the earth's crust is about 8% by weight, second only to oxygen and silicon, ranking third. Among the metal species, second only to steel, it is the second largest metal. Aluminum has good electrical conductivity and ductility, and has a wide range of applications. It covers industries such as light industry, power, electronics, electronics, automobiles, machinery manufacturing, construction, and packaging, and is an important basic raw material for the development of the national economy.
Aluminum and aluminum alloys and other general characteristics
Compared with aluminum and other aluminum alloy materials, it has the following features:
1, low density
The density of aluminum and aluminum alloys is close to 2.7g/, which is about 1/3 of that of iron or copper.
2, high strength
Aluminum and aluminum alloys have high strength. After a certain degree of cold processing can strengthen the matrix strength, some of the aluminum alloys can also be strengthened by heat treatment.
3, good electrical and thermal conductivity
The conductive and thermal conductivity of aluminum is second only to silver, copper and gold.
4, good corrosion resistance
The surface of aluminum is easy to naturally produce a layer of dense and strong AL2O3 protective film, which can well protect the substrate from corrosion. Through anodizing and coloring by hand, cast aluminum alloys with good casting properties or deformed aluminum alloys with good plasticity can be obtained.
5, easy processing
After adding a certain amount of alloying elements, cast aluminum alloy with good casting performance or deformed aluminum alloy with good plasticity can be obtained. Due to its excellent physical properties, aluminum has been widely used in various sectors of the national economy and defense industries. Aluminum is a light structural material with light weight and high strength. Various transportation tools for sea, land and air, especially airplanes, missiles, rockets, artificial earth satellites, etc., use a large amount of aluminum, and the amount of aluminum for a supersonic aircraft. At 70% of its own weight, aluminum for missiles accounts for more than 10% of its total weight. Vehicles made of aluminum and aluminum alloys can reduce energy consumption, and their energy savings are far greater than when aluminum is used. The energy consumed; in the construction industry, the use of aluminum alloy as the door and window of the house and structural materials; the use of aluminum to produce solar collectors, can save energy; in the power transmission, the amount of aluminum in the first place, 90% of the high voltage wire is Made of aluminum; in the food industry, from storage tanks to cans, and beverage containers are mostly made of aluminum; aluminum powder can be used as a reducing agent for refractory metals (such as molybdenum, etc.) and as a deoxidizer in steelmaking. Pots, pans, spoons, etc. used in daily life are mostly made of aluminum.