The Preparation And Application of Aluminum Carbide Powder

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Aluminum carbide The molecular formula of Al4C3 is used to describe this inorganic compound. Aluminum carbide comes as a crystal or powder that is yellow, greenish gray or even bluish. Aluminum carbide powder decomposes in high temperatures, and is then dissolved by cold water into aluminum hydroxide and methane.

The preparation of aluminum carbide

Aluminum carbide is produced by heating alumina with coke in a furnace. Aluminum carbide Al4C3 comes from the direct combination of two metals at high temperatures.
Then, spread carbon powder over the top of a tightly packed layer in a clay pot. Cover the crucible with a lid. Fill in all gaps with a refractory mixture of asbestos fibers and refractory soil. After pre-drying the crucible, the mixture should be heated to a temperature no lower than 1200degC. Higher temperatures can help the reaction progress.

After cooling, the product will be treated with dilute alkaline or hydrochloric acids (or diluted hydrochloric solution) to remove excess aluminium. After obtaining the aluminum carbide as a fine crystalline, powder, it is washed to remove aluminum chloride with water, then quickly wiped away with alcohol. The product is then dried in a box set at 80-90degC. The product contains an excessive amount of aluminum chloride.

Aluminum carbide itself is colorless. However, the products that are made using the above method can have a variety of colors because the raw materials used to make them contain impurities.

A pure product free of aluminum nitride is obtained when the calculated quantity of the mixture of aluminium and soot are calcined with hydrogen. This calcination is carried out between 1800degC and 1900degC, for a duration of 2 to3 hours. The resultant material is then ground, and again calcined to the temperature above.

Aluminum Carbide Application

Aluminum carbide has many applications, including in the production of methane and catalysts. Other typical uses of aluminum carbide are:
1. When combined with silicon carbide, the finely distributed aluminum carbide in the aluminum matrix reduces the tendency of material to creep.

2. The aluminum-aluminum carbide composite material can be made through mechanical alloying by grinding graphite and aluminum powder together.

3. Aluminum carbide may be used as abrasive for high-speed cutting instruments. Its hardness almost matches that of topaz.

4. Aluminum carbide, used as a firework additive, can be used, for instance, to produce the effect of fireflies.

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