摘要
采用改变定向凝固工艺参数的方法研究浇注温度与抽拉速率对DZ22B镍基高温合金与高纯Al2O3陶瓷模壳面层材料间界面反应影响。利用SLM观察界面反应宏观的不同特征区域,使用配备有EDS的SEM分析研究合金-模壳界面反应处的微观结构及对界面反应产物元素种类进行定性分析,通过XRD与XPS对界面反应产物的相与元素价态进行鉴定。结果表明,界面反应产物主要为HfO2与Al1.98Cr0.02O3且沿定向凝固方向呈现区域分布,且在保证定向凝固合金组织的前提下,降低浇注温度、提高抽拉速率能够抑制延缓界面反应的发生。
The effect of casting temperature and withdrawal rate on the interfacial reaction between DZ22B nickel-base superalloy and high-purity Al2O3 ceramic shell facecoat material was studied by changing the parameters of directional solidification process.The SLM was used to observe the different characteristic regions of the macroscopic reaction.The SEM analysis equipped with EDS was used to study the microstructure of the alloy-formed shell interface and the qualitative analysis of the interfacial reaction product elements.The phase and element valence of the interfacial reaction product were identified by XRD and XPS.The results show that the interface reaction products are mainly HfO2 and Al1.98Cr0.02O3 and exhibit a sub-regional distribution along the direction of directional solidification.Under the premise of ensuring the directionally solidified alloy structure,lowering the pouring temperature and increasing the withdrawal rate can inhibit the occurrence of delayed interface reaction.
作者
刘雁焘
刘满平
孙少纯
LIU Yantao;LIU Manping;SUN Shaochun(School of Material Science and Engineering,Jiangsu University,Zhenjiang 212013,Jiangsu,China)
出处
《航空材料学报》
EI
CAS
CSCD
北大核心
2020年第5期60-69,共10页
Journal of Aeronautical Materials
关键词
镍基高温合金
定向凝固
Al2O3陶瓷模壳
粘砂缺陷
抑制措施
nickel based superalloy
directional solidification
Al2O3 ceramic shell
sand burning defect
inhibition measures.
