镀铝改性PS - PVD 7YSZ热障涂层对DZ125合金力学性能的影响

罗纳, 何兵, 张小锋

doi:10.16577/j.issn.1001-1560.2022.0178

材料保护 >

2022 , Vol. 55 >Issue 7: 8 - 15

DOI: https://doi.org/10.16577/j.issn.1001-1560.2022.0178

高温腐蚀防护专栏

镀铝改性PS - PVD 7YSZ热障涂层对DZ125合金力学性能的影响

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1. 广东工业大学材料与能源学院，广东广州 510006； 2. 广东省科学院新材料研究所，广东广州 510651

张小峰(1986-),博士，高级工程师，主要从事航空发动机热障/环境障涂层研究，电话：13825053295,E-mail:zxf200808@126.com;

收稿日期: 2022-01-20

修回日期: 2022-02-22

录用日期: 2022-03-01

网络出版日期: 2023-12-15

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Effect of Aluminized Modified PS - PVD 7YSZ Thermal Barrier Coating on the Mechanical Properties of DZ125 Alloy

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1. School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China;2. Institute of New Materials, Guangdong Academy of Sciences, Guangzhou 510651, China

Received date: 2022-01-20

Revised date: 2022-02-22

Accepted date: 2022-03-01

Online published: 2023-12-15

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摘要

采用等离子喷涂-物理气相沉积工艺(PS-PVD)在DZ125高温合金基体上涂覆镀铝改性热障涂层(TBCs),为了给其在复杂机械载荷使用环境下的应用提供技术支撑，通过扫描电镜观察试样的断口与涂层表面形貌，研究了镀铝改性TBCs对DZ125合金室温拉伸性能、高温持久拉伸性能、高温旋转弯曲疲劳性能的影响。结果表明：涂覆镀铝改性TBCs后，试样的室温拉伸性能与基体合金的相当，其断后伸长率稍有上升，拉伸断口为阶梯状解理面，呈明显的脆性断裂特征；高温持久拉伸断口具有类解理断裂、韧窝断裂的混合特征，持久断裂塑性明显提高，断后伸长率降低；旋转弯曲疲劳断口由疲劳起源区、疲劳扩展区以及瞬断区3个区域组成，带涂层试样的疲劳寿命相较于基体合金的有较大提升。

关键词： DZ125高温合金; 镀铝改性PS-PVD热障涂层; 力学性能; 断口形貌

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罗纳, 何兵, 张小锋 . 镀铝改性PS - PVD 7YSZ热障涂层对DZ125合金力学性能的影响[J]. 材料保护, 2022 , 55(7) : 8 -15 . DOI: 10.16577/j.issn.1001-1560.2022.0178

Abstract

Plasma spraying-physical vapor deposition(PS-PVD) process was applied to prepare aluminized modified thermal barrier coatings(TBCs) on the DZ125 superalloy substrate. In order to provide technical support for the application in service enviornments with complex mechanical loads, the fracture morphology and coating surface of DZ125 superalloy were observed by scanning electron microscope(SEM), and the effects of aluminized modified TBCs on DZ125 alloy in the aspects of tensile properties at room temperature, permanent tensile properties at high temperature and rotating bending fatigue properties at high temperature were investigated. Results showed that the tensile properties of the sample with aluminized modified TBCs at room temperature were equivalent to those of the matrix alloy, and the elongation after fracture increased slightly. Meanwhile, the tensile fracture was stepped cleavage plane, showing obvious brittle fracture characteristics. The high temperature persistent tensile fracture had the mixed characteristics of cleavage fracture and dimple fracture. And the plasticity of the persistent fracture was obviously improved, while the elongation after fracture was reduced. The rotating bending fatigue fracture consisted of three zones: fatigue origin zone, fatigue expansion zone and instantaneous fracture zone. The fatigue life of the coated sample was greatly improved compared with that of the matrix alloy.

Key words： DZ125 superalloy; aluminized modified PS-PVD thermal barrier coating; mechanical properties; fracture morphology

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