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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 and doesn’t conduct electricity at normal 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 undesirable 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. The reaction between aluminum melt and the silicon carbide particles produces an aluminum carbide layer on the surface. This reduces strength. This can be prevented by coating the silicon particles with a suitable oxide, nitride or other material.
Synthesis Method for Aluminum Carbide
Aluminum carbide Al4C3 may be produced by the direct fusion of two elements under high temperature. Mix 1 part heavy black smoke and 6 parts aluminum powder. Moisten the mixture with pine oil. Spread a thin layer of carbon on top. The crucible is covered with a cover and all gaps are smeared in refractory dirt mixed with asbestos fibers. 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 80-90°C. 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 different colors because of impurities. Calculated amounts of aluminum and smoke are calcined using hydrogen. This produces a pure aluminum carbide without aluminum nitride. This calcination must be performed at a temperature between 18001900 and for 23 hours. The product is then ground, and again calcined above the temperature.
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