| 摘要 |
An electric heater supporting plate not likely to be softened/deformed at a high-temperature firing even if a material to be fired contains an alkaline component or an Si component as a volatile component. A passage (2) for a material to be fired surrounded by a ceiling refractory (11), wall refractories (12) and a floor refractory (13) is provided with an electric heater (3) heating from above and an electric heater (5) heating from below. This electric heater (3) has at least its heating unit (31) mounted and supported on a fire-resistant support plate (4), and this support plate (4) in this invention has a two-layer structure in which an electric-insulating ceramic support plate (41) is layered on an SiC-based ceramic plate (42). The two-layer-structure support plates (4) are supported by a refractory (14) installed in a furnace and are arranged in parallel in a plurality of rows in the longitudinal direction of the furnace, and the electric heater (3) is so constructed as to produce heat by being supplied with power from an energizing terminal (32) exposed to the outside of a furnace wall.
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