Chinese name: aluminum carbide

Chemical formula: Al4C3

English name: Aluminum carbide

Melting point: 2100 ℃

Density: 2.36 g/cm ³

CAS No.: 1299-86 - 1

Molar mass: 143.95853 g · mol − 1

Appearance: grey-green powder

Density: 2.36g cm-3

Melting point: 2100 ℃

Boiling point: 2200 ℃

Solubility (water): decomposed by water to produce methane

Δ fHmo298：-209 kJ·mol- 1

Mainly used for:

1) Aluminum carbide is an inorganic compound with the chemical formula of Al4C3. It is a yellow or green-gray crystalline powder, mainly used as a methanogen, catalyst, desiccant, etc.

2) It can also be used in metallurgy. The aluminum carbide particles dispersed in the aluminum matrix composites can reduce the creep trend of the materials, especially when combined with silicon carbide particles.

Aluminium-aluminum carbide alloy can be prepared by mechanical alloying or ball milling of aluminum powder and graphite particles. Aluminum carbide 3) can be used as abrasive particles of high-speed cutting tools, and its hardness is roughly the same as that of corundum.

4) Aluminum carbide is also used in fireworks, for example, to achieve the effect similar to firefly.

5) Aluminum carbide is often used as an additive to enhance the strength of three-component aluminum-based materials (Al-Si-AlC, Al-AlTi-AlC). In addition, AlC is an important compound in the technical field of aluminum metal industry. It is used to reduce metal oxides in the metallurgical industry, chemical reaction catalysts in the chemical industry, and advanced ceramic materials such as high temperature, cutting and mold in the ceramic industry. As an ionic compound, in the lattice structure of AlC, carbon atoms exist in the form of separate C. C has a strong alkalinity and generates methane through C+4H → CH during hydrolysis, so AlC is also used as a methanogen and desiccant. At the same time, the rhombus hexahedron of AlC is a structure with alternating layers of AlC and AlC. It is this unique structure that makes one-dimensional AlC nanowires become a potential cold electron emitter.

6) The preparation of aluminum nitride powder includes: (a) evenly mixing an appropriate amount of micron-sized aluminum powder and micron-sized carbon powder, heating it to a predetermined temperature in an inert atmosphere, and holding it for a period of time to make it react to generate aluminum carbide; (b) Heat aluminum carbide in flowing ammonia or nitrogen to a predetermined temperature and hold it for a period of time, and react with ammonia or nitrogen under high temperature to generate aluminum nitride. Through the invention, aluminum nitride powder can be prepared at relatively low temperature. The prepared powder has high purity, small particle size, uniform particle size distribution, high thermal conductivity and excellent thermal and mechanical properties, which can be widely used in the field of integrated circuit substrate materials and other fields.

Preparation process:

Aluminum carbide Al4C3 is prepared by the direct combination of two simple substances at high temperature. First prepare a mixture consisting of 1 part of heavy soot and 6 parts of heavy aluminum powder, moisten the mixture with pine oil, put a tight layer in a clay crucible, and lay a layer of carbon powder on it. The crucible should be covered with a cover, and all gaps should be coated with refractory soil mixed with asbestos fiber. Then, put the crucible containing the mixture in the oven for pre-drying, and burn the mixture for 30min at a temperature not lower than 1200 ℃. Higher temperature can make the reaction go better. After cooling, dilute hydrochloric acid (or alkali solution) is used to treat the product under cooling to remove excess aluminum. Wash the aluminum carbide prepared as fine crystalline powder with water to remove aluminum chloride, and then quickly wash the water with alcohol, and dry the product in a drying oven at a temperature of 80~90 ℃. The product contains a large amount of aluminum nitride. Pure aluminum carbide is colorless, but the products made by this method often have different colors due to impurities in raw materials. When the calculated amount of aluminum and soot mixture is calcined in hydrogen, the pure product without aluminum nitride can be prepared. The calcination shall be carried out at a temperature of 1800~1900 ℃ for 2~3h. Grind the prepared product and calcine it again at the above temperature.

Storage conditions:

Storage precautions: Store in a cool, dry and well-ventilated special warehouse, with the temperature not exceeding 50 ℃ and the relative humidity not exceeding 75%. Keep away from kindling and heat sources. The package is sealed. It shall be stored separately from acids, etc., and mixed storage is strictly prohibited.