| 摘要 |
PURPOSE:To prevent the clogging of pellets of a mixture of a powdered starting material contg. SiO2 with carbon powder due to SiO and to enhance the productivity when the pellets and gaseous nitrogen are introduced into a reaction furnace to manufacture an Si3N4 type substance, by allowing generated gaseous SiO to be absorbed in a granular carbon material among the pellets. CONSTITUTION:To powder of an SiO2-contg. starting material such as silica sand or silica is added powder of a carbonaceous material such as coke or coal by 2mol as C per 1mol SiO2. They are molded into pellets having 2-10mm. size with a binder such as starch or dextrin. The pellets are blended with granules of activated carbon or charcoal having 6-15mm. size as carbon to be externally charged, and the blend is charged into a reactor. While introducing gaseous nitrogen into the reactor, the pellts are reacted at 1,400-1,450 deg.C for about 240min to manufacture Si3N4. Since gaseous SiO generated from the starting material is absorbed in the externally charged carbon and converted into SiO, it does not stick the pellets together and does not clog them. Accordingly, Si3N4 is stably manufactured. |
