Aluminium is a metallic element is a silver-white light metal that is malleable. Commodities are often made into rods, sheets, foils, powders, ribbons and filaments. In moist air, it can form an oxide film that prevents metal corrosion. Aluminum powder can burn violently when heated in the air, and emit a dazzling white flame. Soluble in dilute sulfuric acid, nitric acid, hydrochloric acid, sodium hydroxide and potassium hydroxide solution, insoluble in water. Relative density 2.70. Melting point 660 ℃. Boiling point 2327 ℃. The content of aluminum in the earth’s crust is second only to oxygen and silicon, ranking third, and it is the most abundant metal element in the earth’s crust. The development of the three important industries of aviation, construction and automobiles requires the material properties to have the unique properties of aluminum and its alloys, which greatly facilitates the production and application of this new metal aluminum. The application is very wide.
01. The light weight, high specific strength and corrosion resistance of aluminum are the outstanding features of its performance. Aluminum has a very low density of 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, rust-proof aluminum, cast aluminum, etc. These aluminum alloys are widely used in aircraft, automobile, train, ship and other manufacturing industries. In addition, space rockets, space shuttles, and artificial satellites also use a large amount of aluminum and its aluminum alloys.
02. The specific strength of aluminum alloy is high
03. Good corrosion resistance
Aluminum is a very reactive metal, but it is stable in general oxidizing environments. This is the formation of an oxide film on the surface of aluminum in oxygen, oxygen and other oxidants. The aluminum oxide film not only has strong corrosion resistance, but also has a certain degree of insulation.
04. The conductivity of aluminum is second only to silver, copper and gold
Although its conductivity is only 2/3 of copper, its density is only 1/3 of copper, so to transmit the same amount of electricity, the quality of aluminum wire is only half of that of copper wire. Therefore, aluminum has a wide range of uses in the electrical appliance manufacturing industry, the wire and cable industry and the radio industry.
05. Aluminum is a good conductor of heat
Its thermal conductivity is 3 times greater than that of iron and 10 times that of stainless steel. Aluminum can be used in industry to manufacture various heat exchangers, heat dissipation materials and cooking utensils.
06. Aluminum has good ductility
It is second only to gold and silver in ductility and can be made into foils thinner than 0.006 mm. These aluminum foils are widely used for packaging cigarettes, candies, etc. They can also be made into aluminum wires and strips, extruded into various special-shaped materials, and can be rolled into various aluminum products. Aluminum can be cut, drilled and welded by conventional methods.
07. Aluminum is not magnetic
It does not generate additional magnetic fields and does not interfere with precision instruments.
08. Aluminum has sound-absorbing properties, and the sound effect is also better
Therefore, aluminum is also used for ceilings in broadcast rooms and modern large-scale buildings.
Post time: Jul-28-2022