Effect of TBCs on Gas Thermal Corrosion Resistance and Mechanical Properties of DD6 Single Crystal
WANG Yufeng1,2,*, FU Qiangang1,*, YANG Jun3, ZHANG Hua2, YANG Yan2
1 National Elite Institute of Engineering, Northwestern Polytechnical University, Xi’an 710072, China 2 AECC Aviation Power Co., Ltd., Xi’an 710021, China 3 The Military Representative Office of the Air Force Equipment Department in Xi’an, Xi’an 710021, China
Abstract: DD6 single crystal high-temperature alloy material has a very broad application prospect in the field of multi type aviation engine manufacturing in China due to its excellent high-temperature service performance. With the continuous development of aviation engine technology in China, the service temperature of the combustion chamber turbine is constantly increasing. DD6 single crystal superalloy cannot fully meet the service environment of high temperature, high pressure, and high speed, and there is an urgent need to research DD6 single crystal surface thermal barrier coating technology. In view of this, this article uses multi arc ion plating technology to prepare NiCoCrAlY metal bonding layer on DD6 single crystal high-temperature alloy, and then uses electron beam physical vapor deposition technology to prepare Y2O3·ZrO2 ceramic surface layer, to study the effect of thermal barrier coating on the gas thermal corrosion resistance and mechanical properties of DD6 single crystal. The results indicate that, after 100 hours of gas hot corrosion performance testing at 900 ℃, a thickness of approximately 100 μm corrosion porosity, pores, and transverse cracks was formed on the surface of DD6. There were no corrosive elements such as Na, K, Ca, Cl, S present inside the BC coating or YSZ coating. A uniform and continuous Al2O3 layer was formed on the surface of the BC coating, and the Na2SO4 adhered to its surface did not undergo high-temperature decomposition. The corrosive medium did not corrode the BC coating. The YSZ coating columnar crystals have good strain tolerance. At high temperatures, the expansion of columnar crystals leads to a reduction in the gap between columnar crystals, and external corrosion media cannot effectively penetrate into the interior of YSZ coating, thus avoiding corrosion damage to the coating or substrate caused by corrosion media. Tensile strength of thermal barrier coating on DD6 single crystal alloy at 980 ℃, there is no adverse effects onσb,σ0.2,δ and ψ, and the fracture mode of the sample is basically consistent. High temperature endurance time and elongation of DD6 single crystal sample coated with thermal barrier coating at 980 ℃,250 MPa, there is no significant difference, and the fracture has a typical dimple fracture morphology, with the fracture mechanism being a ductile fracture mechanism of plastic deformation and creep deformation. Based on the research results of this work, the technical support for the technical development and engineering application of DD6 single crystal super alloy TBCs is established.
通讯作者:
*付前刚,通信作者,西北工业大学材料学院教授、博士研究生导师。2001年7月获西北工业大学工学学士;2004年4月获西北工业大学工学硕士学位,2007年4月获西北工业大学工学博士学位。主要研究方向为高温抗氧化涂层技术,碳/碳复合材料基体改性技术,碳和碳化硅纳米材料的制备、表征与应用。主持国家重点研发计划、国家自然科学基金杰青、优青、基础科研、国家重大研究计划、教育部科学技术研究重大项目等20余项。作为研究骨干参与国家自然基金创新群体等10余项课题。在Carbon、Journal of American Ceramics Society、Corrosion Science等国际著名学术刊物上发表论文300余篇,他人引用5 000余次。获授权发明专利50余项。fuqiangang@nwpu.edu.cn;wyfeng3705@163.com
王玉锋, 付前刚, 杨俊, 张华, 杨岩. 热障涂层对DD6单晶燃气热腐蚀及力学性能的影响[J]. 材料导报, 2024, 38(18): 23070037-6.
WANG Yufeng, FU Qiangang, YANG Jun, ZHANG Hua, YANG Yan. Effect of TBCs on Gas Thermal Corrosion Resistance and Mechanical Properties of DD6 Single Crystal. Materials Reports, 2024, 38(18): 23070037-6.
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2024, Vol. 38 
