To solve problems in constructing a furnace wall of a horizontal induction furnace by conventional technology that a stacked fire-proof board reinforced by glass fiber has heat resistance of only about 400°C, a heat insulating material applying ceramic fiber as a material is poor in its tensile strength of fire-proof column support and has difficulty in supporting, further fire-proofing cement has heat resistance of 1,300°C or more, but it can not be used in a thin plate heating furnace as the the horizontal furnace needs a cylindrical structure, and further a furnace wall repairing work of a short period is needed for the sake of the shortage of binding force of a surface wall structure in a vertical furnace.

A furnace shell 4 composed of a fireproof board of a laminated material reinforced by a glass fiber for reinforcement and the like, is mounted inside of an induction coil 2, and a heat-proof material 5 made out of ceramic fiber and the like is mounted inside of the furnace shell. The air, a gas such as nitrogen, or the cooling water is preferably circulated outside of the furnace shell for cooling.

COPYRIGHT: (C)2005,JPO&NCIPI