GH907高温合金表面电弧离子镀NiCoCrAlY/AlSiY复合涂层的高温抗氧化性能研究  

High-Temperature Antioxidant Property of NiCoCrAlY/AlSiY Composite Coating on the Surface of GH907 High-Temperature Alloy by Arc Ion Plating

作　　者：朱荣涛 丁晓理 陶浩天 关紫匀 燕峰[1] 解志文 ZHU Rongtao;DING Xiaoli;TAO Haotian;GUAN Ziyun;YAN Feng;Xie Zhiwen(School of Mechanical Engineering and Automation,Liaoning Science and Technology University,Anshan 114051,China)

机构地区：[1]辽宁科技大学机械工程与自动化学院,鞍山114051

出　　处：《真空科学与技术学报》2024年第2期167-175,共9页Chinese Journal of Vacuum Science and Technology

摘　　要：为提高GH907高温合金在750℃下高温抗氧化性能。在GH907合金表面采用电弧离子镀技术(AIP)制备NiCoCrAlY/AlSiY复合涂层。系统开展复合涂层的高温抗氧化行为和机理研究,利用XRD、SEM和EDS等微尺度分析表征方法,全面解析氧化过程中物相的结构特征、氧化产物成分及表/截面形貌特征。结果试验表明,750℃氧化500 h后,GH907高温合金氧化层(FeO,Fe_(2)O_(3))萌生大量裂纹,氧化层发生大面积剥落。基体呈迅速氧化增重趋势,500 h质量增重值为22.38 mg/cm^(2)。相比之下,NiCoCrAlY/AlSiY复合涂层在氧化实验中,由于形成连续且致密的Al2O3屏障层,有效抑制氧气内扩散,延缓GH907高温合金发生氧化反应的影响。氧化80 h质量增重为6.37 mg/cm^(2),随后质量增重率趋于稳定,500 h复合涂层质量增重值仅有7.68 mg/cm^(2)。结论由此表明,NiCoCrAlY/AlSiY复合涂层可以显著提高GH907高温合金高温抗氧化性能。To improve the high-temperature oxidation resistance of GH907 high-temperature alloy at 750°C,NiCoCrAlY/AlSiY composite coatings were prepared on the surface of GH907 alloy by arc ion plating(AIP)technique.We systematically studied the high-temperature antioxidant behaviors and mechanisms of composite coatings.Micro-scale analytical characterization methods such as XRD,SEM and EDS were used to comprehensively analyze the physical phase structural characteristics,oxidation product compositions,and surface/cross-section topographic features during the oxidation process.Tests showed that after oxidation at 750℃for 500 h,the oxide layer(FeO,Fe_(2)O_(3))of GH907 high-temperature alloy sprouted a large number of cracks,and the oxide layer occurred a large area of spalling.The substrate showed a tendency to rapidly oxidize and gain weight,with a mass gain value of 22.38 mg/cm^(2) for 500 h.In contrast,NiCoCrAlY/AlSiY composite coating in the oxidation experiment,due to the formation of continuous and dense Al_(2)O_(3) barrier layer,the internal diffusion of oxygen was effectively inhibited,reducing the oxidation reaction impact of GH907 high-temperature alloy.The mass gain of oxidation 80 h was 6.37 mg/cm^(2),then the mass gain rate tended to stabilize,and the mass gain of 500 h composite coating was only 7.68 mg/cm^(2).In conclusion,it showed that the NiCoCrAlY/AlSiY composite coating can significantly improve the high-temperature oxidation resistance of GH907 high-temperature alloy.

关 键 词：GH907高温合金 NiCoCrAlY/AlSiY复合涂层 高温抗氧化机理 

分 类 号：TG174.4[金属学及工艺—金属表面处理]