초록 ▼

A process for producing an ultrafine silicon carbide powder by passing a granulated blend of silica powder, carbon powder and a carbonaceous binder downwardly through a vertical indirect heating reactor, wherein means are provided for increasing the bulk density of the carbon powder for preventing t

A process for producing an ultrafine silicon carbide powder by passing a granulated blend of silica powder, carbon powder and a carbonaceous binder downwardly through a vertical indirect heating reactor, wherein means are provided for increasing the bulk density of the carbon powder for preventing the disintegration of the blend during the reaction which might result from the use of ultrafine powder as the carbon powder in the blend.

대표청구항 ▼

In a process for producing an ultrafine silicon carbide powder which comprises charging a particulate material prepared by blending and granulating silica powder, carbon powder and a carbonaceous binder into a reactor from the top thereof, said reactor having a preheating zone, a heating zone and a

In a process for producing an ultrafine silicon carbide powder which comprises charging a particulate material prepared by blending and granulating silica powder, carbon powder and a carbonaceous binder into a reactor from the top thereof, said reactor having a preheating zone, a heating zone and a cooling zone, allowing the charged material to descend under its own weight in the preheating zone of said reactor till reaching the heating zone, heating said material horizontally in the heating zone to effect a SiC forming reaction, allowing the reaction product to further descend in the cooling zone for cooling it under a non-oxidizing atmosphere, and discharging the reaction product from the bottom of the cooling zone of said reactor, a process capable of preventing the disintegration of the particulate material in the course of the reaction, wherein the carbon powder contained in said particulate material is one having a specific surface area within the range from 1 to 1,000 m2/g and mixed with a liquid composed principally of a liquid organic compound before or at latest when said carbon powder is granulated, and the reaction temperature in the heating zone is controlled within the range from 1,500°to 2,000°C.