Aluminum carburide also known by the name three-carbon-four-aluminum has a molecular form of AL4C3, a kind aluminum carbide. It is a transparent, hard and light yellow-brown rhombohedral crystalline material. It is a ionic crystalline material that does not conduct electricity when at room temperature.
Calcium carbide contains a small amount aluminum carbide. Aluminum carbide is often produced by corroding graphite electrodes when metal aluminum is melted using electrolysis. Aluminum carbide can be an unwanted component of metal matrix composites, or carbon fibres that use aluminum to create a matrix and then increase strength by using carbides. Carbon fiber and aluminum composites are examples of materials that can react when the temperature is above 500. It can be prevented from reacting chemically if it is coated with a titanium boride layer. In the silicon carbid reinforced aluminum-based material, a layer of aluminium carbide is formed on the surface the silicon carbon particles due to the chemical reaction. This can be prevented by coating the silicon particles with a nitride or oxide.
Synthesis of Aluminum Carbon
Aluminum carbide Al4C3 may be produced by combining two substances directly at high temperature. Mix 1 part heavy black smoke and 6 parts aluminum powder. Moisten the mixture with pine oil. Spread a thin layer in a crucible made of clay and then spread a thick layer of carbon. The crucible is covered with a cover and the asbestos fibers mixed with refractory dirt are smeared in all gaps. After pre-drying the mixture, it is then fired in a crucible at a temperature no lower than 1200°C for 30 min. Higher temperatures can improve the reaction. After cooling, the product will be treated with dilute alkaline or hydrochloric acids (or diluted hydrochloric solution) to remove any excess aluminum. After obtaining the aluminum carbide as a fine powder, it is washed to remove aluminum chloride with water. Alcohol is then used to quickly wash away the water. The product is then dried in a box set at a temperature between 80 and 90 degrees. 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 contain impurities. Calculated amounts of the aluminum-soot mixture are calcined using hydrogen. This produces a pure aluminum carbide without aluminum nitride. This calcination must be performed at a temperature between 1800-1900 for a period of 2 to 3 hours. The resulting product is ground, and then calcined once more at the same temperature.
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