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The properties of aluminum and the application of aluminum alloys.
Source: | Author:Samhecarabiner | Published time: 2020-09-23 | 187 Views | Share:
The properties of aluminum and the application of aluminum alloys. 

Aluminum is a light metal, density is 2.7 g/cm3, with good conductivity and ductity, 1 g of aluminum can be pulled into 37 m wire, its diameter is less than 2.5 x 10-5 m, can also be extended into an area of 50 m2 aluminum foil, its thickness is only 8 x 10-7 m. Aluminum conductivity is second only to silver and copper, because it has a high conductivity, is widely used in electrical equipment and high-voltage cables. Aluminium pairs have a light reflectivity of more than 90% of light with wavelengths of 0.2 to 1.2 x 10-6 m. It is therefore extremely important reflective material. Aluminum powder reacts with iron oxide to produce temperatures of up to 3,500 degrees C or more and can be used in special welding techniques. Aluminum powder burns brilliantly, and this particularity is used in lighting and military. A mixture made with aluminum powder 28%, nitric acid 68%, insect glue 4% is a commonly used lighting agent. 

When purity is greater than 99.95%, aluminum resists most acid corrosion, but dissolves in wang water. Manufacturing and construction are the largest markets for the aluminum industry. Transport is the second largest market for aluminum, aluminum in the defense industry also has a wide range of uses, aluminum ships, not only fast, not eroded by seawater, but also no magnetic, can prevent magnetic mine attacks. Aluminum is used in the metallurgical industry to smelt high melting point metals (chromium, vanadium, manganese, molybdenum, etc.) and also as a deoxygenator in the steelmaking process. Aluminum powder can be used to make silver powder paint. Metal cadmium can also be extracted from scrap from the aluminum industry. 

Aluminum in low-temperature environment, strength and mechanical performance is still very good, or even improved, so aluminum can be used not only for frozen food transportation, liquefaturization devices, cold area buildings, but also for rocket liquid hydrogen oxygen storage tank and other parts. Aluminum becomes a superconducting conductor below 1.2K. Today aluminum is widely used in metal appliances, tools, light tools, sports equipment and so on. Aluminum with a small amount of copper, magnesium, manganese, etc. , to form a hard aluminum alloy, this alloy is called hard aluminum, it has a hard and beautiful, lightweight and durable, long-term rust-free advantages, is the ideal material for the manufacture of aircraft. According to statistics, a plane has about half a million strong aluminum rivets. Aircraft components made of aluminum and aluminum alloys account for 70% of the total weight of aircraft. Each missile uses about 10% to 15% of its weight. There are already train tracks laid with aluminum abroad. 
Aluminum bronze is an aluminum-copper alloy that sometimes contains some silicon, manganese, iron, nickel and zinc. These lightweight aluminum alloys are highly sheet-resistant and highly corrosion-resistant, so they are widely used in axle boxes and connecting rods for gasoline engines. 
Magnetic alloys containing 50% iron, 20% aluminum, 20% nickel and 10% cobalt can absorb more than 4,000 times their own weight. Al-Ni-Co alloys are important permanent magnetic alloys. Some aluminum alloys are superplastic, such as Al-Sn alloys, which elonge up to 4,850 times their original length between 20 and 170 degrees C. Zn-Al alloys, on the other foot, become as soft as chewing gum when they are at 250 degrees C.