Chinese name: Aluminum carbide
English name: Aluminium carbide
Chemical formula: Al4C3
Molecular weight: 143.96 CAS
Appearance and properties: yellow or greenish-gray crystalline block or powder, hygroscopic.
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It is used in metallurgy and as a catalyst and for methane production.
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 field of metal and aluminum industry technology,
In the metallurgical industry for reducing metal oxides, in the chemical industry for chemical reaction catalysts, in the ceramic industry for the production of high temperature, cutting and mold and other advanced ceramic materials. As a kind of
Ionic compounds, in the lattice structure of AlC, the carbon atoms exist as separate C forms. C is very alkaline and produces methane through C+4H→CH when hydrolyzed, so AlC also acts as a catalyst
Methane-generating agent and desiccant. At the same time, the rhombohedron of AlC is a structure of alternating stacking of AlC and AlC sheets. It is this unique structure that makes one-dimensional AlC nanowires a kind of nanowires
A potentially cold electron emitter.
1) Aluminum nitride powder is prepared based on aluminum carbide, including: (a) mixing an appropriate amount of micron aluminum powder and micron carbon powder evenly, placing them in an inert atmosphere and heating them to a predetermined temperature for a period of time to make them react
Aluminum carbide; (b) The aluminum carbide is heated to a predetermined temperature in a flowing ammonia or nitrogen gas and held for a period of time, and the aluminum carbide reacts with the ammonia or nitrogen gas at high temperatures to produce aluminum nitride. By the invention,
Aluminum nitride powder can be prepared at a relatively low temperature, and the prepared powder has high purity, small particle size and uniform particle size distribution, high thermal conductivity and excellent thermal and mechanical properties.
It can be widely used in the substrate materials of integrated circuits.
2) Prepare an aluminum carbide nanoribbon. The crucible equipped with aluminum-silicon alloy is placed in the furnace, the furnace door is closed, the vacuum is pumped to 50Pa~10-3Pa, and then the protective gas argon is filled, and then the temperature is heated to 700℃~1600℃
It is kept warm for 1-20 hours, and then cooled to normal temperature naturally, and many yellow aluminum carbide nanoribbons are generated on the surface of the alloy and the inner wall of the graphite crucible. The aluminum carbide nanoribbon prepared by the invention has thin thickness and less impurity;
The length of aluminum carbide nanoribbons is long, which can reach several millimeters; The cost of growing aluminum carbide nanoribbons is very low; There is no environmental pollution, simple preparation equipment.
