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等离子喷涂热障涂层在燃烧器循环试验中的动态热演化与损伤失效：固有裂纹与孔隙缺陷的作用
Dynamic Thermal Evolution and Damage Failure in Plasma-Sprayed Thermal Barrier Coatings During a Burner Cycle Test: Roles of Intrinsic Cracks and Pore Defects
Coatings
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Multidisciplinary Digital Publishing Institute
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TBC缺陷模型：裂纹合并六类，损伤面积+40%
AI理解
要点 TBC 缺陷数值模型：固有裂纹致表面温差 15°C、界面法向应力 +70%/剪切 +48%，POR-CR 损伤面积高 40%，裂纹合并归纳六类。
能不能用 TBC 失效机制数值研究，对涂层服役寿命预测有参考价值。模型研究无工艺参数；结论基于数值模型，需实验验证。
存疑
- 数值模型研究，无工艺数据
- 结论依赖模型假设，需实验验证
中文摘要
热障涂层（TBC）中的固有缺陷严重影响其隔热性能和使用寿命。本工作基于同一图像开发四种典型 TBC 模型，定量比较缺陷对隔热和界面损伤的影响。考虑了热生长氧化物（TGO）与梯度热循环的耦合行为。探讨了多缺陷模型中固有裂纹、孔隙边缘裂纹和界面裂纹的扩展与演化。结果表明，固有裂纹导致平坦涂层表面温度差高达 15°C。固有缺陷对界面温度无影响。与无缺陷模型相比，固有裂纹使界面附近法向应力最大增加 70%，剪切应力增加 48%。POR-CR 模型的完全损伤面积比 HOM 模型高 40%。基于更贴近真实微观结构的 POR-CR 模型，内部裂纹与界面裂纹的合并方式被归纳为六种类型。相关结果可为全面理解在役涂层的失效机制和准确预测使用寿命提供重要数据支持。
查看英文摘要
The intrinsic defects in thermal barrier coating (TBC) seriously affect its thermal insulation performance and service life. In this work, four typical TBC models are developed based on the same image to quantitatively compare the effects of defects on insulation and interface damage. The coupling behavior of thermally grown oxide (TGO) and gradient thermal cycling is considered. The propagation and evolution of intrinsic, pore edge, and interface cracks in the multi-defect model are explored. Results indicate that intrinsic cracks cause a temperature difference of up to 15 °C on the flat coating surfaces. Intrinsic defects have no effect on interface temperature. Compared to the defect-free model, intrinsic cracks result in a maximum increase of 70% in normal stress near the interface and a 48% increase in shear stress. The fully damaged area in the POR-CR model is 40% higher than that in the HOM model. Based on the POR-CR model, which is closer to the real microstructure, the merging methods of internal and interface cracks are summarized into six types. The relevant results can provide important data support for a comprehensive understanding of the failure mechanism of in-service coatings and accurate prediction of service life.
原文依据
查看原文依据
- Results indicate that intrinsic cracks cause a temperature difference of up to 15 °C on the flat coating surfaces.
- Compared to the defect-free model, intrinsic cracks result in a maximum increase of 70% in normal stress near the interface and a 48% increase in shear stress.
- The fully damaged area in the POR-CR model is 40% higher than that in the HOM model.
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DOI: 10.3390/coatings16101206