The main factors affecting SiC decomposition zone in the hearth are expo unded, the technological measures are put forword from the respects of strengthen ing SiC formation reaction, controlling short period of smelting and adjusting pa rameters.

• 论述了影响炉膛内碳化硅分解区大小的主要因素，并从强化碳化硅的生成反应、控好冶炼过程的小周期及电气参数等方面提出了扩大碳化硅分解区的工艺措施。