The wide application of aluminum

Aluminum has a density of 2.7g/cm³ (one-third of the density of iron and copper), good ductility, and conductive capacity of two-thirds of copper wire, but the quality is only one-third, the price is cheaper, and it is widely used in the manufacture of high-voltage wires, cables, and radio industries. The density of pure aluminum is relatively low, but the density and hardness of aluminum alloy have been greatly improved, and aluminum alloy has been widely used in aircraft, automobiles, trains, ships and other manufacturing industries. In addition, space rockets, space shuttles, artificial satellites also use a lot of aluminum and its aluminum alloy; Aluminum is a good conductor of heat (thermal conductivity is 3 times greater than iron), industrial aluminum can be used to manufacture a variety of heat exchangers, heat dissipation materials and cookware; Aluminum has good ductility (second only to gold and silver), and can be made into 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; In the air, the surface of aluminum will form a dense oxide protective film, making it resistant to corrosion, so it is often used in the manufacture of medical devices, chemical reactors, refrigeration units, petroleum refining units, oil and gas pipelines, etc. Thermite is commonly used to melt refractory metals and weld steel rails. Aluminum is also used as a deoxidizer in the steelmaking process. Aluminum powder and graphite (or other oxides of high melting point metals) are evenly mixed according to a certain ratio, coated on metal, and calcined at high temperature to make high temperature resistant cermet, which has important applications in rocket and missile technology; Burning aluminum in oxygen gives off a lot of heat and dazzling light, and is often used to make explosive mixtures, Such as ammonium aluminum explosive (made of aluminum powder, ammonium nitrate, charcoal powder, smoke black and other combustible organic compounds), combustion mixtures (such as bombs and artillery shells made of thermite can be used to attack targets that are difficult to fire or tanks, artillery, etc.) and lighting mixtures (such as aluminum powder 28%, barium nitrate 68% and shellac 4%). ; Aluminum powder has a silver-white luster (the color of general metal in powder form is mostly black), commonly used to do paint, commonly known as silver powder, silver paint, to protect iron products from corrosion, and beautiful; Low temperature resistance, when the temperature of aluminum is low, its strength increases without brittleness, so it is ideal for low temperature equipment materials, such as cold storage, freezer, Antarctic snow vehicles, hydrogen oxide production equipment; Aluminum plate reflection performance of light is also very good, reflection of ultraviolet light is stronger than silver, the more pure aluminum, the better its reflection ability, so commonly used to manufacture high-quality mirrors, such as solar stove mirrors; Some food additives also contain metal aluminum like alum, leavening agent, starter, etc., in some fried dough sticks, steamed bread, twist, verdicts and some puffed food (potato chips) are also used; Aluminum has sound absorption performance, and the sound effect is also good, so the broadcast room and the ceiling of the modern large building are also made of aluminum. Many doors and Windows in the family use aluminum alloy frame is also for this consideration.