Using Sic or Mosi2 as the chamber heating elements(1200c above the silicon carbide rod(Sic)or silicon molybdenum rod(Mosi2)will be using).The loading platform also has the heating ability, at the same time it has the fine loading and supporting capacity.The furnace door and the bottom are designed as a whole, the opening mode is electric, the motor drives the reducer to drive the loading platform in and out, and the finite bit switch is installed.The furnace mouth and the charging platform are closed by the cross of the steps. The upper and lower sides of the charging platform have angles. The opening Angle of the charging platform increases and the closing Angle of the charging platform gradually decreases.