Al_2O_3-MgO 系, ZrO_2-CaO 系および Al_2O_3-CaO 系基板と溶鉄とのぬれ性

概要

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An attempt to clarify the clogging mechanism of immersion nozzle from the standpoint of wettability has carried out by preparing the following substrates : substrates of Al_2O_3 and ZrO_2-CaO, which are main components of nozzle materials, substrates of Al_2O_3 and Al_2O_3-MgO, main components of inclusions, and substrate of Al_2O_3-CaO, reaction product by contact of inclusion with ZrO_2-CaO nozzle. Contact angles between these substrates containing CaO or MgO lower than 20mass% and liquid irons were measured at 1873K. In the cases using irons containing the same level of oxygen as molten steel for continuous casting, the following relations are obtained by comparing the values of contact angle obtained for each substrate ; Contact angle : Al_2O_3, Al_2O_3-MgO>ZrO_2-CaO≧Al_2O_3-CaO. These results indicate qualitatively that the use of ZrO_2-CaO refractory instead of Al_2O_3 refractory as immersion nozzle may lead to a retardation of adhesion of Al_2O_3 inclusions to the refractory, though decrease in force of adhesion due to the observed changes in wettability is only about 30%.
社団法人日本鉄鋼協会の論文
1994-10-01