La对CMSX-4单晶合金与型壳润湿性及界面反应的影响  

Effect of La on Mould Wettability and Interfacial Reaction between CMSX-4 Single Crystal Alloy and Ceramic Mould

作　　者：韩伟豪 余建波 任忠鸣[1,2] Han Weihao;Yu Jianbo;Ren Zhongming(State Key Laboratory of Advanced Special Steel,Shangahi 200444,China;Shanghai University,Shangahi 200444,China)

机构地区：[1]省部共建高品质特殊钢冶金与制备国家重点实验室,上海200444 [2]上海大学材料科学与工程学院,上海200444

出　　处：《特殊钢》2024年第4期104-110,共7页Special Steel

基　　金：国家科技重大专项(项目号J2019-VI-0023-0140)。

摘　　要：为了获取高质量的含稀土单晶叶片,采用座滴法研究了La含量对CMSX-4单晶合金与陶瓷型壳润湿性及界面反应的影响。实验结果表明,添加90×10^(-6) La时,合金与型壳的润湿角略有下降,合金中仅发现Al与型壳中的SiO_(2)发生反应,形成产物为Al_(2)O_(3);当合金中w[La]达到143×10^(-6)时,合金与型壳的润湿角显著下降,合金中的La和Al都与型壳中的SiO_(2)发生反应;随后继续增加La含量,界面处析出不同La、Al原子比的铝酸镧化合物,润湿角变化不大。由此可见,实验中,143×10^(-6)为CMSX-4单晶合金中La发生界面反应的临界含量,而且,La与SiO_(2)的反应可以提高合金/型壳体系的润湿性。In order to obtain high-quality rare earth containing single crystal blades,the effect of La content on the wettability and interface reaction between CMSX-4 single crystal alloy and ceramic mould was studied by the droplet method.The experimental results show that when the 90×10^(-6) La is added,the wetting angle between the alloy and the mould decreases slightly,and only Al reacts with SiO_(2) in the mould and the reaction product is Al_(2)O_(3).When the La content in the alloy reaches 143×10^(-6),and the wetting angle between the alloy and the mould decreases significantly,and both La and Al in the alloy react with SiO_(2) in the mould.Subsequently the La content continue to increase,and the lanthanum aluminate compounds with different La and Al atomic ratios are precipitated at the interface,and the wetting angle changes little.It can be seen that in the present experitment 143×10^(-6) is the critical content of interfacial reaction of La in CMSX-4 single crystal alloy,and the reaction between La and SiO_(2) can improve the wettability of the alloy/mould system.

关 键 词：La含量 CMSX-4单晶合金 润湿性 界面反应 

分 类 号：TG249.5[机械工程—精密仪器及机械]