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首页> 外文期刊>Separation and Purification Technology >Thermal and structural stability of Zr-based amorphous thin films for potential application in hydrogen purification
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Thermal and structural stability of Zr-based amorphous thin films for potential application in hydrogen purification

机译：Zr基无定形薄膜的热和结构稳定性，用于氢净化的潜在应用

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Amorphous alloys are of particular interest due to their less susceptibility to hydrogen embrittlement and corrosion, superior mechanical properties and more importantly lower cost compared to the Pd-based crystalline membranes. Amorphous thin films of Zr40.5Ni59.5, Zr56.2Cu43.8, Zr30Cu57.7Y12.3, and Zr32Cu57.3Ti10.7 alloys are fabricated by the magnetron sputtering method. All alloys are thermally stable until above 400 degrees C under an inert atmosphere. Nevertheless, the thermal stabilities of all alloys are reduced by almost more than 150 degrees C under hydrogen with exception of the Zr40.5Ni59.5 alloy showing comparable thermal stability under hydrogen and inert. Structural analyses by XRD under hydrogen and an inert atmosphere reveal decomposition of the studied amorphous alloys during the crystallisation process, leading to severe phase separation for Ni and Cu in Zr40.5Ni59.5 and Zr56.2Cu43.8 alloys. Such a phase separation seems to have an influence on the crystallisation path and products. However, Cu phase separation seems to be mitigated in Zr30Cu57.7Y12.3, and Zr32Cu57.3Ti10.7 alloys despite their higher Cu content compared to Zr56.2Cu43.8 alloy. The surface segregation tendency of Cu results in surface crystallisation in the Zr56.2Cu43.8 alloy, whilst bulk nucleation and growth dominates the crystallisation process in the other alloys, evident by the non-isothermal kinetic studies. The calculated activation energies show that more energy is required for nucleation compared to the growth process in the Zr40.5Ni59.5 and Zr56.2Cu43.8 alloys, whilst is the opposite case in Zr30Cu57.7Y12.3, and Zr32Cu57.3Ti10.7 alloys. (C) 2017 Elsevier B.V. All rights reserved.
机译：由于与Pd基结晶膜相比，无定形合金具有特别感兴趣的耐氢脆性和腐蚀，卓越的机械性能和更重要的成本，以及更重要的成本。通过磁控溅射法制造了ZR40.5NI59.5，ZR56.2CU43.8，Zr56.2Cu43.8，Zr30Cu57.7月，ZR32Cu57.3Ti10.7合金。在惰性气氛下，所有合金都热稳定直至400℃以上。然而，在氢气下，所有合金的热稳定性降低了几乎大于150℃，Zr40.5Ni59.5合金除，氢气下显示出相当的热稳定性。 XRD在氢气下的结构分析和惰性气氛揭示了在结晶过程中研究的非晶合金的分解，导致Zr40.5Ni59.5和Zr56.2Cu43.8合金中Ni和Cu的严重相分离。这种相分离似乎对结晶路径和产品产生影响。然而，Cu相分离似乎在Zr30Cu57.7Y12.3中减轻，并且Zr32Cu57.3Ti10.7合金尽管与Zr56.2Cu43.8合金相比，其含量较高。 Cu的表面分离趋势导致Zr56.2Cu43.8合金中的表面结晶，而散装成核和生长占据了其他合金中的结晶过程，由非等温动力学研究明显显而易见。计算出的激活能表明，与Zr40.5Ni59.5和Zr56.2Cu43.8和Zr56.2Cu43.8和Zr30Cu57.7Y12.3和Zr32Cu57.3ti10.7相比，与Zr40.5Ni59.5和Zr56.2Cu43.8和Zr32cu57.3ti10.7相比，核切割需要更多的能量。合金。 （c）2017 Elsevier B.v.保留所有权利。

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