Cr_(2)O_(3)涂层对硅基陶瓷型芯与镍基单晶高温合金润湿性及界面反应的影响  

Effect of Cr_(2)O_(3) Coating on Wettability and Interfacial Reaction Between Silicon-Based Ceramic Core and Nickel-Based Single Crystal Superalloy

作　　者：何家宝 王亮[1] 邹明科 张朝威[1] 王新广[1] 姜肃猛[1] 吴佳欣 孟杰[1] 周亦胄[1] He Jiabao;Wang Liang;Zou Mingke;Zhang Chaowei;Wang Xinguang;Jiang Sumeng;Wu Jiaxin;Meng Jie;Zhou Yizhou(Shi-changxu Innovation Center for Advanced Materials,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,China;Third Military Representative Room in Shenyang Area Air Force Equipment,Shenyang 110144,China)

机构地区：[1]中国科学院金属研究所师昌绪先进材料创新中心,辽宁沈阳110016 [2]中国科学技术大学材料科学与工程学院,辽宁沈阳110016 [3]空装驻沈阳地区第三军事代表室,辽宁沈阳110144

出　　处：《稀有金属材料与工程》2025年第1期202-208,共7页Rare Metal Materials and Engineering

基　　金：国家重点研发计划(2017YFA0700704,2019YFA0705300);四川省科技计划(省院省校合作项目)(2022YFSY0016);辽宁省优秀青年基金(2021-YQ-02)。

摘　　要：通过多弧离子镀法在硅基陶瓷型芯表面制备Cr_(2)O_(3)涂层,借助高温原位座滴法实验研究了Cr_(2)O_(3)涂层对硅基陶瓷型芯与镍基单晶高温合金在1550℃接触后的润湿行为以及界面反应行为的影响,并利用SEM、EDS和XRD对界面反应后的界面形貌、元素分布以及反应产物进行了分析。研究发现,镍基单晶高温合金在涂覆Cr_(2)O_(3)涂层的硅基陶瓷型芯上的润湿角为98.29°。高温合金熔体中Hf、Al与Cr_(2)O_(3)涂层反应,在高温合金底部生成HfO_(2)、Al_(2)O_(3)以及游离的Cr。生成的Al_(2)O_(3)形成保护层阻止高温合金中活泼元素向界面扩散,但仍有少量高温合金熔体与失去涂层保护的硅基陶瓷基体发生反应,在界面处生成Al_(2)O_(3)以及游离的Si。生成的Cr、Si在界面处富集并在高温合金表面生成CrSi_(2);部分Si自高温合金表面向内部扩散,与W等难熔元素在高温合金近表面处形成(Mo,W,Re)_(5)Si_(3)。结果表明,镍基单晶高温合金在涂覆Cr_(2)O_(3)涂层的硅基陶瓷型芯上的润湿角相较于在未表面改性的硅基陶瓷型芯上的润湿角小,润湿性好。综合上述分析,在硅基型芯表面涂覆Cr_(2)O_(3)涂层有利于改善铸件局部位置的合金充型,但对界面反应控制效果有限。This research applied Cr_(2)O_(3) coating on the surface of silicon-based ceramic core through multi-arc ion plating method.The effect of Cr_(2)O_(3) coating on wetting behavior and interface reaction behavior of silicon-based ceramic core and nickel-based single crystal superalloy after contact at 1550℃were studied using high-temperature in-situ droplet method.The interface morphology,element distribution,and reaction products after the interface reaction were analyzed using SEM,EDS,and XRD.The results show that the wetting angle between nickel-based single crystal superalloy and silicon-based ceramic core coated with Cr_(2)O_(3) is 98.29°.Hf and Al in superalloy melt react with Cr_(2)O_(3) coating,generating HfO_(2),Al_(2)O_(3),and free Cr at the bottom of superalloy.The generated Al_(2)O_(3) forms a protective layer to prevent the diffusion of active elements in superalloy to the interface.However,a small amount of superalloy melt still reacts with the silicon-based ceramic substrate without coating protection,generating Al_(2)O_(3) and free Si at the interface.The generated Cr and Si are enriched at the interface and form CrSi_(2) on the superalloy surface.Part of Si diffuses from the surface of the superalloy to the interior,forming(Mo,W,Re)_(5)Si_(3) with refractory elements such as W near the surface of superalloy.The results indicate that the wetting angle of nickel-based single crystal superalloy on silicon-based ceramic core coated with Cr_(2)O_(3) is smaller than that on unmodified silicon-based ceramic cores,and its wettability is better.Based on the above analyses,the Cr_(2)O_(3) coating on the surface of silicon-based cores is beneficial to improve the filling of alloy at local positions of castings,but its control effect on interface reactions is limited.

关 键 词：Cr_(2)O_(3)涂层 硅基陶瓷型芯 镍基单晶高温合金 润湿性 界面反应 

分 类 号：TG174.444[金属学及工艺—金属表面处理] TG132.33[金属学及工艺—金属学]