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Study on Nb interlayer as Cr[sbnd]Zr diffusion barrier layer at high-temperature
International Journal of Refractory Metals & Hard Materials ( IF 4.2 ) Pub Date : 2024-11-09 , DOI: 10.1016/j.ijrmhm.2024.106956
Yuxin Zhong, Shixin Gao, Moyijie Huang, Yuntai Luo, Sha Zhao, Ping Chen, Chunyu Yin, Liang He, Jijun Yang, Kun Zhang

The study examined the diffusion mitigation effect and mechanical properties of the Nb interlayer prepared by magnetron sputtering as a CrZr diffusion barrier through annealing experiment, high-temperature air oxidation experiment and ring compression tests. The results show that the presence of an Nb interlayer significantly alleviates the CrZr interdiffusion, especially prevents the CrZr interdiffusion in the 1200 °C air environment and stabilizes the interface structure in the 1400 °C air environment. After undergoing air oxidation at 1200 °C, the Cr/Nb-coated samples showed the structure of Cr2O3, Cr, Cr2Nb Laves phase, Nb, (Zr, Nb) miscibility gap, β-Zr, α-Zr(O), and ZrO2 layers. During a certain period of argon annealing at 1332 °C, the increase in the thickness of the interlayer of the Cr/Nb coating, especially for samples containing micron sized Nb layer, is smaller than that of Cr-coated samples, indicating that the presence of the Nb layer is effective in alleviating the CrZr contact reaction to a certain extent. During the ring compression tests, the Cr/Nb coating is still firmly bonded to the Zr alloy cladding tube even under large deformation, and the micron-scale Nb layer releases part of the stress, resulting in short crack clusters on the surface of the coating instead of a large number of through-wall cracks. In summary, the Nb layer has the potential to be used as a diffusion barrier for CrZr interface, and the details of Nb as a diffusion barrier are discussed.

中文翻译:


高温下 Nb 夹层作为 Cr[sbnd]Zr 扩散阻挡层的研究



该研究通过退火实验、高温空气氧化实验和环形压缩试验,研究了磁控溅射制备的 Nb 中间层作为 CrZr 扩散屏障的扩散缓解效果和力学性能。结果表明,Nb夹层的存在显著减轻了CrZr的相互扩散,特别是阻止了CrZr在1200 °C空气环境中的相互扩散,并在1400 °C空气环境中稳定了界面结构。在 1200 °C 空气氧化后,Cr/Nb 涂层样品呈现 Cr2O3、Cr、Cr2Nb Laves 相、Nb、(Zr、Nb) 混溶隙、β-Zr、α-Zr(O) 和 ZrO2 层的结构。在 1332 °C 的氩气退火一定时间内,Cr/Nb 涂层夹层厚度的增加,特别是对于含有微米级 Nb 层的样品,小于 Cr 涂层样品,表明 Nb 层的存在在一定程度上有效缓解了 CrZr 接触反应。在环压缩试验中,即使在大变形下,Cr/Nb 涂层仍牢固地结合在 Zr 合金熔覆管上,微米级 Nb 层释放了部分应力,导致涂层表面出现短裂纹簇,而不是大量穿壁裂纹。综上所述,Nb 层具有用作 CrZr 界面扩散势垒的潜力,并讨论了 Nb 作为扩散势垒的细节。
更新日期:2024-11-09
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