摘要
熔融金属和铸型之间的界面反应对铸件的表面质量影响很大,锆合金在熔融状态下具有很强的活泼性,易与铸型材料发生反应,因此,对锆合金和铸型材料间的界面反应过程展开了研究。试验采用石墨和氧化钇铸型在真空自耗凝壳炉中制备了锆试样,对锆试样的表层采用SEM、XRD、EDS等方法进行了检测,重点分析了试样表层和铸型之间元素的扩散和物相的变化。结果表明,试样表面均形成了反应层,在扫描电镜下,Zr/C试样的反应层完整而均匀,Zr/Y2O3试样的反应层脆性较强而呈现不均匀分布。型壳元素O、Y、C均扩散到了熔融锆合金中,并且在表层形成了物相ZrC、Zr3C、YO1.335、Y6ZrO11等。
The interthcial reaction between the molten alloy and molds has a great effect on the surface quality of castings. Zirconium alloys are very active in molten state and tend to react with the mold materials. The interfacial reaction process between surface of zirconium alloy castings and mold materials was researched. The zirconium casting samples were prepared in the vacuum arc skull furnace with the graphite mold and yttria ceramic mold. The surface of the zirconium samples were tested through SEM, EDS, XRD and so on. The research was centered on the diffusion of the chemical elements and changes of the phases. The results show that the reaction layers were both formed on the surface of the two samples. The Zr/C sample＇ s reaction layers were uniformed and the Zr/Y203 sample＇s were scattered and brittle. The molds chemical elements C, O and Y diffused into the molten zirconium and new phases such as ZrC, Zr30, YOI335 and Y6ZrOH formed on the surface.
出处
《铸造》
CAS
CSCD
北大核心
2013年第11期1052-1056,共5页
Foundry
基金
国家自然科学基金(51075285)
辽宁省自然科学基金(20102222)
关键词
石墨型
氧化钇陶瓷型
锆合金
界面反应
graphite mold
yttrium oxide ceramic mold
zirconium alloy
interfacial reaction
