| 摘要 |
PROBLEM TO BE SOLVED: To provide a heat treatment furnace capable of unifying the distribution of temperature in a heating chamber by reducing the heat dissipation from a muffle to the external. SOLUTION: This heat treatment furnace includes a furnace body 1 provided with a heat treatment space S inside thereof and having an opening part connected with the heat treatment space at its lower part, a heating mechanism 8 mounted in the furnace body 1 or the heat treatment space S, the muffle mounted inside of the heating mechanism 8, constituting a heating chamber 4, and penetrated through the furnace body 1 at least at its upper part, and a hearth mounted on a specific position in the heat treatment space S through the lower opening of the furnace body 1 and supporting a treated object. The heat conductance of an end part of the muffle positioned at an upper side of the muffle is determined to be lower than that of a central part of the muffle positioned at a heat treatment space S side, and a boundary between the muffle central part and the muffle end part is positioned between the furnace body 1 and the heat treatment space S. COPYRIGHT: (C)2005,JPO&NCIPI
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