Views: 2 Author: Site Editor Publish Time: 2022-09-02 Origin: Site
The use of substances depends largely on the nature of substances. Because aluminum has many excellent properties, it has a wide range of applications.
(1) The density of aluminum is very small, only 2.7 g/cm. Although it is relatively soft, it can be made into various aluminum alloys, such as hard aluminum, super hard aluminum, antirust aluminum, cast aluminum, etc. These aluminum alloys are widely used in aircraft, automobiles, trains, ships and other manufacturing industries. In addition, space rockets, space shuttles and artificial satellites also use a large amount of aluminum and its aluminum alloys. For example, a supersonic aircraft is composed of about 70% aluminum and its aluminum alloy. Aluminum is also widely used in ship construction. A large passenger ship often uses thousands of tons of aluminum.
(2) The conductivity of aluminum is second only to that of silver and copper. Although its conductivity is only 2/3 of that of copper, its density is only 1/3 of that of copper. Therefore, the quality of aluminum wire is only half of that of copper wire when transmitting the same amount of electricity. The oxide film on the surface of aluminum not only has the ability of corrosion resistance, but also has a certain degree of insulation, so aluminum is widely used in the electrical appliance manufacturing industry, wire and cable industry and radio industry.
(3) Aluminum is a good conductor of heat. Its thermal conductivity is three times greater than that of iron. In industry, aluminum can be used to make all kinds of heat exchangers, heat dissipation materials and cookers.
(4) Aluminum has good ductility (its ductility is second only to gold and silver), and it can be made into aluminum foil thinner than 0.01 mm at 100 ℃ ~ 150 ℃. These aluminum foils are widely used for packaging cigarettes, candy, etc. they can also be made into aluminum wires and strips, and can roll various aluminum products.
(5) Due to the dense oxide protective film on the surface of aluminum, it is not easy to be corroded. It is often used to manufacture chemical reactors, medical devices, refrigeration devices, oil refining devices, oil and natural gas pipelines, etc.
(6) Aluminum powder has silver white luster (generally, the color of metal in powder form is mostly black). It is often used as paint, commonly known as silver powder and silver paint, to protect iron products from corrosion and beautiful.
(7) Aluminum can emit a lot of heat and dazzling light when it is burned in oxygen. It is often used to make explosive mixtures, such as ammonium aluminum explosives (mixed with ammonium nitrate, charcoal powder, aluminum powder, soot and other combustible organic substances), combustion mixtures (such as bombs and shells made of thermite can be used to attack targets that are difficult to catch fire or tanks, cannons, etc.) and lighting mixtures (such as barium nitrate 68%, aluminum powder 28%, shellac 4%).
(8) Thermite is often used to melt refractory metals and weld rails. Aluminum is also used as a deoxidizer in the steelmaking process. Aluminum powder is evenly mixed with graphite, titanium dioxide (or oxides of other high melting point metals) at a certain ratio, coated on the metal, and calcined at high temperature to make high temperature resistant cermet. It has important applications in rocket and missile technology.
(9) Aluminum plates also have good light reflection performance. The reflected ultraviolet ray is stronger than that of silver. The purer aluminum is, the better its reflection ability is. Therefore, it is often used to manufacture high-quality reflectors, such as solar cooker reflectors.
(10) Aluminum has sound absorption performance and good sound effect, so aluminum is also used in the ceilings of broadcasting rooms and modern large-scale buildings.
(11) Low temperature resistance. When the temperature is low, the strength of aluminum increases without brittleness, so it is an ideal production device for low-temperature device materials, such as refrigerators, freezers, Antarctic snow vehicles, and hydrogen oxide.