摘要
为了抑制浇注叶片时合金液与硅基陶瓷型芯的界面反应,从而提高叶片内腔的表面质量,本工作采用原位座滴法研究了多弧离子镀沉积Al_(2)O_(3)涂层对硅基陶瓷型芯与镍基单晶高温合金界面反应及润湿性的影响。利用光学轮廓测量仪、SEM和XRD分别对界面反应后合金与陶瓷的表面质量、形貌、元素分布、反应产物进行了分析。结果表明,施加Al_(2)O_(3)涂层的硅基陶瓷型芯与合金熔体在高温下接触后,只在合金底部少数区域形成了Al_(2)O_(3)及硅化物;而未表面改性的硅基陶瓷型芯与合金熔体接触后,在合金底部形成了连续、致密的Al_(2)O_(3)反应层,且基本覆盖合金底部。合金熔体在施加Al_(2)O_(3)涂层的硅基陶瓷型芯上的润湿角为89.1°,优于在未表面改性的硅基陶瓷型芯上的100.4°,润湿性显著提高。
Ni-based single-crystal superalloys weaken or even eliminate the influence of weak grain boundaries at high temperatures and contain≥60%(volume fraction)of L1_(2)-type coherent ordering y'-Ni_(3)(Al,Ti)precipitation strengthening phase.These superalloys exhibit excellent properties at high tem-peratures such as,high resistance to oxidation,creep,and fatigue resistance,making them the preferred materials for manufacturing advanced aviation engine turbine blades.The inner cavity structure of engine turbine blades has become complex with the rapid development of the engine manufacturing industry,making investment casting technology as a key technology in blade production.Si-based ceramics are selected as core materials owing to their low thermal expansion coefficient,good dimensional stability,and easy solubility.However,during pouring,active elements such as Hf,Al,and Cr,in the superalloy liq-uid,undergo thermo-physicochemical and thermomechanical infitration with the cores when they come in contact with Si-based ceramic cores for extended period at high temperatures.This results in interface re-actions and sand formation on the casting surface,thereby reducing the quality of the blade's inner sur-face and increasing subsequent processes such as eliminating the reaction layer through certain chemi-cal methods.To suppress the interface reaction between the superalloy liquid and Si-based ceramic cores during blade casting and improve the surface quality of the blade inner cavity,the effect of Al_(2)O_(3).coating on the surface of Si-based ceramic cores were investigated using the multi-arc ion plating meth-od.Furthermore,the effect of Al_(2)O_(3)coating on the interface reaction and wettability between Si-based ce-ramic cores and the superalloy were explored using the in situ droplet method.The surface quality,mor-phology,element distribution,and reaction products of the interface reaction were analyzed via optical profilometry,SEM,and XRD,respectively.It has been found Al_(2)O_(3)and silicides are generated in few ar-eas at the bottom of the superalloy after high-temperature contact between the Al_(2)O_(3)-coated Si-based ce-ramic cores and superalloy melt.However,a continuous and dense Al_(2)O_(3)reaction layer is formed at the bottom of the superalloy after contact between the unmodified Si-based ceramic cores and superalloy melt.The wetting angles of the superalloy melt on the Al,Os-coated and unmodified Si-based ceramic cores are 89.1°and 100.4°,respectively,indicating that the wettability is substantially improved by the Al_(2)O_(3)coating.Results indicate that applying Al_(2)O_(3)coating on Si-based ceramic cores can effectively sup-press the interface reaction between Ni-based single-crystal superalloy and Si-based ceramic cores and improve the filling ability of the superalloy liquid during casting.
作者
何家宝
王亮
张朝威
邹明科
孟杰
王新广
姜肃猛
周亦胄
孙晓峰
HE Jiabao;WANG Liang;ZHANG Chaowei;ZOU Mingke;MENG Jie;WANG Xinguang;JIANG Sumeng;ZHOU Yizhou;SUN Xiaofeng(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)
出处
《金属学报》
北大核心
2025年第7期1093-1108,共16页
Acta Metallurgica Sinica
基金
国家重点研发计划项目Nos.2017YFA0700704和2019YFA0705300
四川省科技计划项目(省院省校合作项目)No.2022-YFSY0016
辽宁省优秀青年基金项目No.2021-YQ-02。
