Composition and manufacturing process of aluminum foil
Aluminum is a light metal whose compounds are widely distributed in nature. The content of aluminum in the earth's crust is about 8% by weight, ranking third only after oxygen and silicon. In the category of metals, it is the second largest category after steel. Aluminum has good conductivity and ductility, and has a wide range of applications, involving light industry, electric power, electrical, electronics, automotive, mechanical manufacturing, construction, packaging, and other industries. It is an important basic raw material for the development of the national economy.
Aluminum and its alloys and other general characteristics
Compared to other metal materials, aluminum and aluminum alloys have the following characteristics:
1. Low density
The density of aluminum and aluminum alloys is close to 2.7 g/, 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, the strength of the matrix can be strengthened, and some grades of aluminum alloys can also be strengthened through heat treatment.
3. Good electrical conductivity and thermal conductivity
Aluminum has electrical and thermal conductivity that is second only to silver, copper, and gold.
4. Good corrosion resistance
The surface of aluminum is easy to naturally produce a dense and strong AL2O3 protective film, which can effectively protect the substrate from corrosion. Through artificial anodizing and coloring, cast aluminum alloys with good casting properties or deformed aluminum alloys with good processing plasticity can be obtained.
5. Easy to process
After adding certain alloying elements, a cast aluminum alloy with good casting performance or a deformed aluminum alloy with good processing plasticity can be obtained. Due to its excellent physical properties, aluminum has been widely used in various industries of the national economy and the national defense industry. As a lightweight structural material, aluminum is light in weight and strong in strength. Various means of transportation, especially aircraft, missiles, rockets, and artificial Earth satellites, use a large amount of aluminum. A supersonic aircraft uses 70% of its own weight, and a missile uses more than 10% of its total weight; Various vehicles made of aluminum and aluminum alloys can reduce energy consumption, and the energy savings far exceed the energy consumed during aluminum smelting; In the construction industry, aluminum alloy is used as the door, window, and structural material of houses; Solar collectors made of aluminum can save energy; In the field of power transmission, the consumption of aluminum ranks first, with 90% of high-voltage electrical conductors made of aluminum; In the food industry, from storage tanks to cans to beverage containers, most are made of aluminum; Aluminum powder can be used as a reducing agent for refractory metals (such as molybdenum) and as a deoxidizer in steelmaking. Most pots, pans, spoons, etc. used in daily life are made of aluminum.