連続溶融金属めっき用セラミックス製ロールの熱応力に関する研究

概要

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The zinc coated steel sheet has been often used for automobile and other industries because of its high corrosion resistance. This paper deals with the development of new ceramics support roll used for a continuous galvanizing pot to manufacture stable galvanized steel sheet. Usually stainless steel rolls are used to support and stabilize the strip in a continuous galvanizing pot, which is filled with molten zinc. However, corrosion and abrasion arise on the roll surface only in a few weeks, and causing the deterioration of quality of plating. Although developing ceramics rolls is most desirable, sometimes fracture occurs when the ceramic roll dips into molten metal. In this paper, therefore, how to reduce the thermal stress is considered when the ceramic rolls are installed in molten metal bath using finite volume method and finite element method. The usefulness of silicon nitride having extreamly high conductivity is also discussed.
2004-12-25