ZrB2-BASED POWDER, TREATMENT METHOD FOR ZrB2-BASED POWDER, REFRACTORY MATERIAL, PRODUCTION METHOD FOR REFRACTORY MATERIAL, LINING MATERIAL FOR MELTING FURNACE, MELTING FURNACE, AND PRODUCTION METHOD FOR MELTING FURNACE

摘要

PROBLEM TO BE SOLVED: To provide a ZrB2-based powder capable of increasing the electrical resistance of a refractory material containing the ZrB2-based powder and its treatment method; a refractory material and its production method; a melting furnace lining material; and a melting furnace and its production method.

SOLUTION: The refractory material 20 is produced by a process comprising the step of heating a ZrB2-based powder 11 as the refractory raw material in the air at a specified temperature for a specified time to subject the powder to an oxidation treatment to form a non-conductive ZrO2-based ceramic layer 12 on the surface of the ZrB2-based powder and the step of removing, by cleaning, a glass component generated simultaneously with the ZrO2-based ceramic layer in the oxidation treatment. After a furnace is lined with the refractory material to form a crucible, a heater is set in the furnace to subject the refractory material to an oxidation treatment under heating.

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