目的 揭示湿热环境中La0.7Ca0.3Cr0.95Mn0.05O3复合涂层的性能演变和机理。方法 使用等离子喷涂技术分别制备La0.7Ca0.3Cr0.95Mn0.05O3高发射率层/YSZ热障层/NiCoCrAlY金属黏结层/GH4099基体（LC/Y/M/G）和La0.7Ca0.3Cr0.95Mn0.05O3/金属黏结层/TA15基体（LC/M/T）2种材料。在温度85 ℃、湿度85%RH的湿热试验箱内进行加速老化试验,测试2种复合涂层的耐湿热性能。分别在5、10、15、20、25 d时取样,测量样品的涂层结合强度。使用激光共聚焦显微镜、电化学工作站等设备对涂层进行表征。结果 在温度85 ℃、湿度85%RH的湿热加速老化试验中,LC/Y/M/G和LC/M/T 2种材料体系均未发生La0.7Ca0.3Cr0.95Mn0.05O3层的相结构和表面粗糙度Ra的变化。使用拉伸试验法测得LC/Y/M/G涂层结合强度为（22.75±3.07）MPa,未随加速老化试验的时长发生明显变化,断裂位置始终发生在YSZ层。与之相比,LC/M/T涂层结合强度初始值为（41.58±3.24）MPa,并呈指数下降,断裂位置在金属黏结层。对TA15基体和NiCoCrAlY金属黏结层开展电化学腐蚀行为分析,发现金属黏结层（6.950 2 μA/cm2）的自腐蚀电流显著高于TA15基体（0.110 8 μA/cm2）,且老化试验后的金属黏结层界面中观察到更多的孔隙缺陷。结论 LC/Y/M/G和LC/M/T 2种材料体系中的La0.7Ca0.3Cr0.95Mn0.05O3层均表现出了良好的耐湿热性。但LC/M/T中的金属黏结层在试验过程中容易发生腐蚀,导致复合涂层的结合强度随湿热试验的延长呈指数衰减,成为涂层失效的薄弱位置。但当涂层中添加YSZ层后,金属黏结层的腐蚀得到了有效抑制,这可以归因于YSZ中间层对氧气、水蒸气等的阻隔作用。
Abstract
To reveal the performance evolution and mechanism of La0.7Ca0.3Cr0.95Mn0.05O3 composite coating in hygrothermal environments, two distinct coating systems are fabricated via plasma spraying technology: La0.7Ca0.3Cr0.95Mn0.05O3 high emissivity layer/YSZ thermal barrier layer/NiCoCrAlY metallic bonding layer/GH4099 substrate (LC/Y/M/G) and La0.7Ca0.3Cr0.95Mn0.05O3/metallic bonding layer/TA15 substrate (LC/M/T). Accelerated aging tests are conducted in an environmental chamber under controlled conditions (85 ℃, 85% RH) for 25 days to simulate hygrothermal degradation. Samples are taken at 5, 10, 15, 20, and 25 days to measure the coating bonding strength of the samples. Characterization of coatings is conducted with equipment such as confocal laser microscopy and electrochemical workstations. X-ray diffraction (XRD) analysis indicates no significant changes in the macroscopic morphology or crystal structure of the coatings before and after the 25-day aging test. The La0.7Ca0.3Cr0.95Mn0.05O3 phase remains stable, with no detectable phase transitions or new phase formation. Surface roughness measurements reveals that the surface roughness of the LC/Y/M/G coating decreases from 11.03 μm to 9.70 μm, and the Ra value of the LC/M/T coating decreases from 10.52 μm to 9.53 μm. Due to the randomness of the surface roughness of the atmospheric plasma spray coating, it is considered that there is no significant change in the surface roughness Ra. Cross-sectional analysis of bonding strength demonstrates distinct failure modes: LC/Y/M/G system: Fractures occur at the YSZ layer with a bonding strength of (22.75±3.07) MPa, showing negligible degradation during aging; LC/M/T system: Fractures appear in the metallic bond coats with an initial strength of (41.58±3.24) MPa, but exhibit significant exponential decay over time. However, with the extension of accelerated aging test time, there is a significant exponential decay trend in the bonding strength, and the decay function is fitted. Electrochemical tests on the TA15 substrate, and metallic bond coats reveal electrochemical corrosion behaviors. For the self-corrosion current densities: the metallic bond coats (6.950 2 μA/cm2) >TA15 (0.110 8 μA/cm2). After the accelerated aging test, a large number of pitting micro-areas are observed at the cross section of the metallic bonding layer, and more pore defects are found at the interface of the metallic bonding layer, which lead to the stress concentration phenomenon in the bonding strength test, and finally lead to the attenuation of the bond strength. The La0.7Ca0.3Cr0.95Mn0.05O3 layers in the LC/Y/M/G and LC/M/T material systems all show good resistance to dampness and heat. However, the metallic bonding layer in LC/M/T is prone to corrosion during the test, which will lead to the exponential attenuation of the bonding strength of the composite coating with the extension of the damp heat test, which will become the weak position of the coating failure. However, when the YSZ layer is added to the coating, the corrosion of the metallic bonding layer is effectively inhibited, which can be attributed to the blocking effect of the YSZ middle layer on corrosive media such as oxygen and water vapor.
关键词
涂层结合强度 /
电化学腐蚀 /
金属黏结层 /
点蚀 /
TA15 /
加速老化试验
Key words
coating bonding strength /
electrochemical corrosion /
metallic bonding layer /
pitting corrosion /
TA15 /
accelerated aging test
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