Aluminum and aluminum alloy products Features
Aluminum and aluminum alloy products Features
(1) Low density.
The density of industrial pure aluminum containing 99.5% aluminum is 2.7g/cm’, only iron (7.86g/cm) or copper
(8.92g/cm') about 1/3. Reducing the mass of metal structural materials is extremely important for many industrial sectors, especially the aerospace industry.
(2) Good electrical conductivity.
The resistivity of aluminum (20℃) is 2.83x10·m, and its conductivity is equivalent to 60%~65% of copper, but aluminum
The density of aluminum is only 1/3 of copper, so by volume, aluminum's electrical conductivity actually exceeds copper's electrical conductivity. In addition, aluminum wires are easy to cool, are not easily burned by current, and can support larger currents. Therefore, it is more economical to make cables and wires out of aluminum than copper wires.
(3) Good thermal conductivity.
The thermal conductivity of aluminum is about three times greater than that of iron, second only to silver, copper, and gold. The heat dissipation materials of many heat exchangers in industry are made of aluminum and aluminum alloys.
(4) High strength.
Although the strength of pure aluminum is not high, its strength can be doubled through cold working, and after adding alloying elements and further strengthening through heat treatment, its strength is comparable to that of high-quality alloy steel. Adding a small amount of manganese, magnesium, silicon, zinc, titanium, iron, copper and other metals to aluminum can obtain good mechanical properties and can meet the needs of various industrial sectors, such as building materials and various profiles.
(5) Good plasticity.
Aluminum is suitable for various processing methods. It can be pressed into sheets and foils, drawn into pipes and filaments, ground into fine powder, extruded into complex-shaped profiles, and manufactured into various art objects and decorations.
(6) Good corrosion resistance.
Pure aluminum will quickly combine with oxygen in the air to form a dense and strong aluminum oxide (Al20) film on the surface. This protective film makes aluminum well resistant to atmospheric corrosion and water corrosion, and can prevent internal corrosion. Aluminum continues to oxidize
(7) Reflective ability is very strong.
The reflectivity of aluminum is above 85%, and its ability to reflect ultraviolet rays is stronger than silver. The purer the aluminum, the stronger this reflective ability. Aluminum can be used as a reflector of radiant energy of any wavelength, and can reflect electromagnetic waves from radar and radio, as well as infrared rays, visible light, etc. The polished surface of aluminum has a reflectivity of more than 80% for white light.
(8) Aluminum has a silvery white luster, and has the characteristics of non-toxic, non-contaminating food, flavor retention, anti-corrosion, anti-drying, airtight, and light-proof. Therefore, aluminum rolled into foil can be used to package various foods.
(9) Aluminum has good sound-absorbing properties. Modern buildings and broadcast rooms use aluminum foil or aluminum plate veneers as sound insulation materials.
(10) Aluminum is a non-magnetic material and is generally not affected by magnetic fields. It will not produce sparks when impacted. Therefore, some parts on precision instruments and compasses on ships are made of aluminum products. In addition, aluminum foil is also used in the electronics industry to make shields.
(11) Aluminum does not produce sparks or burn during collision, so some explosion-proof shells are also made of aluminum products.
(12) Aluminum is a super-insulating (insulating) material that can be used as a cold or heat insulation material.
