| 摘要 |
PURPOSE:To prepare fine powdery silicon carbide (SiC) at a low cost, by mixing Si obtained by reducing SiF4 using metallic Na, K or Al with carbon or a carbonaceous substance and heating the resultant mixture in a nonoxidizing atomosphere. CONSTITUTION:SiF4 gas or the gas generated by decomposing an alkali silicofluoride under heating is brought into contact with metallic powder or granule of Na, K or Al to react therewith. The metal for the reduction is then dissolved and removed with a solution of an acid, and the remaining residue is filtered to give fine Si powder, which is mixed with a granular carbon black or graphite or a carbonaceous, substance cellulose or carbonized resin powder, and heated in a nonoxidizing atmosphere. After the carbonization, the remaining carbon is removed by heating in the air to prepare the aimed fine powdery SiC powder of high purity. |
