[China Aluminum Network] (1) The density of aluminum is very small, only 2.7g/cm, although it is relatively soft, but can be made into a variety of aluminum alloys, such as hard aluminum, super hard aluminum, rust-proof aluminum, cast aluminum Wait. 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 large quantities of aluminum and its aluminum alloys. For example, a supersonic aircraft consists of about 70% aluminum and its aluminum alloy. Large quantities of aluminum are also used in shipbuilding, and the amount of aluminum used in a large passenger ship often amounts to several thousand tons.
(2) The conductivity of aluminum is second only to silver and copper. Although its conductivity is only 2/3 of that of copper, its density is only 1/3 that of copper. Therefore, the same quantity of electricity is delivered, and the quality of aluminum wire is only copper. half. The oxide film on the surface of aluminum not only has the ability to resist corrosion, but also has a certain degree of insulation, so aluminum has a wide range of applications 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. Industrially, aluminum can be used to make various heat exchangers, heat sinks, and cooking utensils.
(4) Aluminum has good ductility (its ductility is second only to gold and silver) and can be made thinner than 0.01 mm aluminum foil at 100°C to 150°C. These aluminum foils are widely used for packaging cigarettes, candies, aluminum wires, aluminum strips, and various aluminum products.
(5) Due to the dense oxide protective film on the surface of aluminum, it is not susceptible to corrosion and is often used to make chemical reactors, medical equipment, refrigeration equipment, petroleum refining equipment, oil and gas pipelines, etc.
(6) Aluminum powder has a silvery white luster (generally the color of the metal is black when powdered), commonly used as paint, commonly known as silver powder, silver paint, to protect the iron products from corrosion, and beautiful.
(7) The combustion of aluminum in oxygen can release a large amount of heat and dazzling light. It is commonly used in the manufacture of explosive mixtures, such as ammonium aluminum explosives (combined from ammonium nitrate, charcoal powder, aluminum powder, black smoke, and other flammable organic substances). Combustion mixtures (such as bombs and shells made of aluminum heat can be used to attack difficult targets or tanks, artillery, etc.) and lighting mixtures (such as 68% niobium nitrate, 28% aluminum, 4% shellac).
(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 and graphite, titanium dioxide (or other high-melting-point metal oxides) are uniformly mixed at a certain ratio, coated on metal, and calcined at a high temperature to make high-temperature resistant cermets, which have important applications in rocket and missile technology. .
(9) The reflection performance of aluminum plate is also very good, and the reflected ultraviolet ray is stronger than silver. The purer the aluminum, the better its reflection ability, so it is often used to manufacture high-quality mirrors, such as solar stove reflectors.
(10) Aluminum has sound-absorbing properties and sound effects are also good. Therefore, aluminum is also used in broadcast rooms and ceilings in modern large-scale buildings.
Commonly used distance measurement methods include tape measure distance and photoelectric distance measurement. The measuring distance of a tape measure is measured along the ground using a tape-like ruler that can be rolled up, which is a direct measuring distance. Photoelectric ranging is to use an instrument to transmit and receive modulated light waves between two points, and measure the distance according to its propagation speed and time. It belongs to electronic physical ranging. Photoelectric ranging is indirect ranging.
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