What does aluminum do

The use of a substance depends to a large extent on its properties. Because aluminum has many excellent properties, it has a very wide range of uses. (1) the density of aluminum is very small, only 2.7g /cm, although it is soft, but can be made into a variety of aluminum alloy, such as duralumin, super duralumin, rust resistant aluminum, cast aluminum and so on. These aluminum alloys are widely used in aircraft, automobiles, trains, ships and other manufacturing industries. In addition, space rockets, space shuttle, artificial satellites also use a lot of aluminum and aluminum alloys. A supersonic aircraft, for example, is made up of about 70 percent aluminum and its alloys. Aluminum is also used extensively in ship construction, with a large passenger ship often using several thousand tons of aluminum. (2) the conductivity of aluminum is second only to silver and copper, although its conductivity is only 2/3 of copper, but the density is only 1/3 of copper, so the transmission of the same amount of electricity, the quality of aluminum wire is only half of that of copper wire. 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 in the electrical manufacturing industry, wire and cable industry and radio industry has a wide range of uses. (3) aluminum is a good conductor of heat, its thermal conductivity is 3 times greater than iron, industrial aluminum can be used to make a variety of heat exchangers, cooling materials and cookware. (4) Aluminum has good ductility (its ductility is second only to gold and silver), can be made of aluminum foil thinner than 0.01mm at 100 ℃ ~ 150 ℃. These aluminum foil is widely used in packaging cigarettes, candy, etc., can also be made into aluminum wire, aluminum strip, and can roll a variety of aluminum products. (5) Because of the dense oxide protective film on the surface of aluminum, it is not easy to be corroded. It is often used in the manufacture of chemical reactors, medical devices, refrigeration units, petroleum refining units, oil and gas pipelines, etc. (6) aluminum powder with silver luster (general metal in the form of powder color is mostly black), commonly used to do paint, commonly known as silver powder, silver paint, to protect iron products from corrosion, and beautiful. (7) When burned in oxygen, aluminium gives off a great deal of heat and dazzling light, and is often used to make explosive mixtures. For example, ammonium aluminum explosive (made of ammonium nitrate, charcoal powder, aluminum powder, smoke black and other combustible organic compounds), combustion mixture (such as bombs and shells made of thermite can be used to attack hard-to-fire targets or tanks, artillery, etc.) and lighting mixture (such as barium nitrate 68%, aluminum powder 28%, shellac 4%). (8) Thermite is commonly used to melt refractory metals and weld rail, etc. Aluminum is also used as a deoxidizer in steelmaking. Aluminum powder and graphite, titanium dioxide (or other high melting point metal oxides) according to a certain ratio of evenly mixed, coated on the metal, after high temperature calcination and made of high temperature resistant cermet, it has important applications in rocket and missile technology. (9) The reflection performance of aluminum plate to light is also very good, the reflection of ultraviolet light is stronger than silver, the more pure aluminum, the better its reflection ability, so it is commonly used to manufacture high quality mirrors, such as solar stove mirrors, etc. (10) Aluminum has sound absorption performance and sound effect is better, so the broadcasting studio, modern large buildings indoor ceiling is also used aluminum. (11) Low temperature resistance, when the temperature of aluminum is low, its strength instead increases without brittleness, so it is an ideal material for low temperature devices, such as cold storage, freezer, Antarctic snow vehicles, hydrogen oxide production equipment.