部分稳定氧化锆(PSZ)因具有耐高温、优良的抗侵蚀性以及良好的抗热震性而广泛用于连铸用定径水口.实验针对当前PSZ定径水口使用寿命短、易炸裂、抗冲刷性能差以及扩径快等问题,采用连铸现场取样分层分析研究的方法,借助SEM及XRD分析技术,对氧化锆质定径水口的损毁机理进行了系统的分析研究.研究结果表明:高温下稳定剂MgO首先脱溶到界面,固溶的CaO稳定剂分布均匀；随着熔渣渗入,脱溶的MgO稳定剂与固溶的CaO稳定剂发生固溶置换；随着侵蚀进一步加剧,CaO与熔渣反应完后MgO又与熔渣反应而脱溶.稳定剂的不断脱溶,导致氧化锆失稳,由立方相转变为单斜相,相变产生体积效应,从而形成裂纹,氧化锆颗粒破裂,水口强度大幅度下降,发生溶解和剥落.
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