The outstanding characteristics of aluminum and aluminum alloy performance（2）

The use of a substance depends to a large extent on the properties of the substance. Because aluminum has a variety of excellent properties, aluminum has an extremely wide range of uses.
Aluminum and its aluminum alloys are currently one of the most widely used and most economical materials. Since 1956, the world's aluminum output has surpassed the copper output and has always ranked first in the non-ferrous metals. At present, the output and consumption of aluminum (calculated in tons) is second only to steel, and it has become the second largest metal used by human beings. Moreover, aluminum resources are very rich. According to preliminary calculations, the mineral reserves of aluminum account for more than 8% of the constituent materials of the earth's crust. .

Aluminum's light weight, high specific strength and corrosion resistance are outstanding features of its performance.

07 Aluminum powder has silvery white luster
Generally, the color of metal in powder form is mostly black, and it is often used as paint, commonly known as silver powder and silver paint, to protect iron products from corrosion and to be beautiful.
08 Burning in oxygen gives off heat and dazzling light
Commonly used in the manufacture of explosive mixtures, such as ammonium-aluminum explosives (mixed with ammonium nitrate, charcoal powder, aluminum powder, soot and other flammable organics), combustion mixtures (such as bombs and shells made of thermite can be used to attack difficult Fire targets or tanks, cannons, etc.) and lighting mixtures (such as barium nitrate 68%, aluminum powder 28%, shellac 4%).
09 Thermite is often used to smelt refractory metals and weld rails
Aluminum is also used as a deoxidizer in the steelmaking process. Aluminum powder, graphite, titanium dioxide (or oxides of other high melting point metals) are uniformly mixed in a certain ratio, coated on the metal, and calcined at high temperature to make a high temperature resistant cermet, which has important applications in rocket and missile technology. .
10 The reflective performance of the aluminum plate to light and heat is also very good
Reflecting ultraviolet rays is stronger than silver. The purer the aluminum, the better its reflective ability. Therefore, it is often used to manufacture high-quality reflectors, such as solar cooker reflectors, and can also be used as thermal insulation materials.
11 Aluminum is not magnetic
It does not generate additional magnetic fields and does not interfere with precision instruments.
12 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.
13 aluminum low temperature resistance
When the temperature of aluminum is low, its strength increases without brittleness, so it is ideal for low-temperature device materials, such as refrigerators, freezers, Antarctic snow vehicles, and hydrogen oxide production devices. At the same time, the low temperature resistance of aluminum is small. When the resistance of aluminum is below 50K, the resistance of aluminum is lower than that of high-purity copper and silver. When aluminum is below 1.2K, it becomes a superconductor.