使用BaZrO3坩锅结合真空感应加热技术熔炼钛含量66%(摩尔分数)的富钛合金,通过宏观显微镜、X射线衍射仪、扫描电子显微镜及电子耦合仪分析BaZrO3坩锅与熔体接触后的显微组织及其组成元素(Ba,Zr和O)在合金中的熔解量;研究BaZrO3坩锅剥落损毁及与钛熔体界面反应机理.结果显示:BaZrO3坩锅受熔体侵蚀层厚度约2000μm,合金中锆和氧含量随着熔体与坩埚接触时间增加而增加.界面反应产物BaO与空气中水分和CO2反应生成BaCO3,晶体体积变化破坏晶粒间结合力,导致坩埚剥落损毁.富钛熔体对BaZrO3耐火材料的溶解侵蚀是坩埚受损的主要原因.
The titanium enrichment (66%, mole fraction) alloy was melted in the BaZrO3 crucible to investigate the crucible damage and erosion mechanism. By the optical microscopy, scanning electron microscopy, X-ray diffractometry and atomic emission spectrometry, the microstructure and the dissolution of BaZrO3 refractory after contacting the melt with different time were studied. The results show that the thickness of erosion layer of the BaZrO3 crucible is measured as about 2000 μm. The Zr and O elements contents in the alloys increase with rising the contacting time. The damage of BaZrO3 crucible is caused by the changing of crystal volume, as the BaO transforms into BaCO3. The main mechanism responsible for the erosion of BaZrO3 crucible is the dissolution of BaZrO3 refractory in the titanium enrichment melt.
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