Residual elastic strain and survivability of stabilized zirconia coated carbon-carbon (C/C) composite
Residual elastic strain and survivability of stabilized zirconia coated carbon-carbon (C/C) composite
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DOI：
10.1016/j.surfcoat.2023.129811
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发表时间：
2023-07
影响因子：
5.4
通讯作者：
J. I. Ferguson;Abdullah Al Saad;M. H. Şeren;J. P. Ko;K. Nygren;R. Trice;M. Sangid
中科院分区：
文献类型：
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作者：
J. I. Ferguson;Abdullah Al Saad;M. H. Şeren;J. P. Ko;K. Nygren;R. Trice;M. Sangid
碳-碳（C/C）复合材料需要保护涂层，以便在高温、氧化环境中长期使用。陶瓷涂层可以提供氧化保护;然而，热膨胀失配与涂层沉积期间的热事件和界面约束相结合可能导致残余应力，这可能影响系统的寿命和性能。这项工作利用高能量同步辐射X射线衍射，以确定深度分辨残余弹性应变在两个稀土氧化物稳定的氧化锆（12摩尔%氧化钇和6摩尔%钐）涂层，应用到碳-碳复合材料基板。沉积涂层的实验表征表明，拉伸到压缩的残余弹性应变梯度，这是一致的基于能量的模型，说明了晶体结构的残余应力状态的依赖性。通过氧乙炔炬曝光，烧蚀行为和裂纹扩展与测量的残余弹性应变状态相关，并突出了加工和曝光引起的残余应力对涂层性能的影响。这些实验性的残余弹性应变测量和与失效机制的关系支持这些涂层系统在需要热保护系统（TPS）的应用中的生存能力。
Carbon-carbon (C/C) composites require protective coatings for prolonged use in elevated temperature, oxidizing environments. Ceramic coatings can provide oxidation protection; however, thermal expansion mismatch in conjunction with thermal events and interfacial constraint during coating deposition can result in residual stress, which can affect the lifetime and performance of the system. This work leveraged high energy synchrotron X-ray diffraction to determine the depth resolved residual elastic strain in two rare-earth oxide stabilized zirconia (12 mol% yttria and 6 mol% samaria) coatings, applied to a carbon-carbon composite substrate. The experimental characterization of the as-deposited coatings indicated a tension to compression residual elastic strain gradient, which was consistent with an energy-based model that illustrated the crystal structure dependence of the residual stress state. Via an oxyacetylene torch exposure, the ablation behavior and crack propagation were correlated to the measured residual elastic strain state and highlighted the influence of processing and exposure induced residual stress on coating performance. These experimental residual elastic strain measurements and relation to failure mechanisms support the survivability of these coating systems in applications that require thermal protection systems (TPS).