Chemical elements
    Physical properties
    Chemical properties
      Aluminium subfluoride
      Aluminium trifluoride
      Aluminium trichloride
      Aluminium tribromide
      Aluminium iodide
      Aluminium chlorate
      Aluminium perchlorate
      Aluminium bromate
      Aluminium periodate
      Aluminium suboxide
      Aluminium sesqui-oxide
      Aluminium peroxide
      Aluminium hydroxides
      Tricalcium aluminate
      Sodilim aluminate
      Aluminium sesqui-sulphide
      Aluminium selenide
      Aluminium telluride
      Aluminium sulphite
      Aluminium sulphate
      Sodium alum
      Potassium alum
      Ammonium alum
      Hydroxylamine alum
      Silver alum
      Aluminium dithionate
      Aluminium selenite
      Aluminium selenate
      Aluminium chromate
      Aluminium molybdate
      Aluminium silicomolybdate
      Aluminium tungstate
      Aluminium silicotungstate
      Aluminium phosphotungstate
      Aluminium nitride
      Aluminium phosphide
      Aluminium arsenide
      Aluminium nitrate
      Aluminium Phosphates
      Basic aluminium arsenite
      Aluminium carbide
      Aluminium carbonate
      Aluminium thiocyanate
      Aluminium oxalate
      Aluminium alkyls
      Aluminium Hydrocarbon
      Aluminium acetylacetonate
      Aluminium silicide
      Aluminium silicates
      Aluminosilicic acids aluminosilicates
      Aluminium Borides
      Aluminium Boride
      Aluminium Boride
      Aluminium borocarbides
      Aluminium borate
      Aluminium sodium perborate
    PDB 1a6e-1zca
    PDB 2b8w-3i62
    PDB 3kql-5ukd

Aluminium carbide, Al4C3

Aluminium carbide, Al4C3, is prepared by heating fragments of aluminium with sugar carbon in a carbon crucible in the electric furnace and rapidly cooling the product. It may also be prepared by heating a mixture of aluminium powder and carbon for twenty minutes in a Perrot furnace or over the blowpipe; or the reaction may be started by inflaming a mixture of aluminium powder and barium peroxide on the surface. Aluminium carbide is also produced by heating aluminium with hexachlor-benzene at 225°. According to Pring, the production of the carbide in the electric furnace is apparently due to the reaction: -

6Al + 3COAl4C3 + Al2O3,

but the elements aluminium and carbon can unite directly, the combination in vacuo becoming perceptible at 650° and rapid at 1400°.

Aluminium carbide, purified by washing with a cold, concentrated solution of potassium hydroxide, and then with alcohol and ether, forms yellow, rhombohedral crystals of density at 2.36. At temperatures between 400° and 1400° aluminium carbide is stable in vacuo; but above 1400° it dissociates at an appreciable rate, and at 1800° the change is rapid. Accordingly, at high temperatures alumina is reduced by carbon with the formation of much free aluminium, while at lower temperatures aluminium carbide only is produced. At temperatures below 1400° aluminium carbide acts as a reducing agent on metallic oxides, e.g.: -

Al4C3 + 12CuO = 12Cu + 3CO2 + 2Al2O3,

but at higher temperatures alloys are produced, the carbon only being oxidised. With metallic chlorides it yields organometallic compounds.

Aluminium carbide is slowly but completely decomposed by water, aluminium hydroxide and methane being produced: -

Al4C3 + 12H2O = 4Al(OH)3 + 3CH4.

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