Thermodynamics and Kinetics of Ni/Al and Ru/Al Morphologies

Ni/Al 和 Ru/Al 形貌的热力学和动力学

• 批准号: 426208833
• 负责人: Professorin Dr. Isabella Gallino, Ph.D.
• 金额: --
• 依托单位: Department Erziehungswissenschaft
• 依托单位国家: 德国
• 项目类别: Research Grants
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/426208833?language=en
• 关键词: Thermodynamics; Kinetics; Ni; Al; Ru

The aim of this project is to address open questions regarding the influence of the morphology on the reaction thermodynamics and kinetics of morphologically designed reactive Ni/Al multilayer materials. As a result of the collaboration with the consortium partners, the previous project was able to perform first-time calorimetric investigations of multilayers with different levels of complex geometry and to measure the heat flow during ignition that follows thermal shock. For the first time, the activation energy of the reaction was detected using five orders of magnitude of heating rates, from 0.1 K/s up to 10000 K/s. This was possible by combining differential scanning calorimetry (DSC) with the novel flash calorimetry (FDSC). A novel FDSC methodology to measure free-standing multilayer films was developed and applied, among others to three different systems: (1) planar nanoscaled Ni/Al multilayers with different bilayer periodicities and compositions where a two-stage mechanism for interdiffusion prior to reaction was observed, (2) the synthesis of a B2-structured high entropy alloy films using Ni/Al multilayers as a heat source where the ignition of the reaction was observed in situ in FDSC, and (3) the formation of nickel aluminides from Ni/Al multilayer samples mixed by high-pressure torsion, where we have showed that FDSC can be used to selectively investigate material reactivity at various locations of a single specimen having heterogeneous microstructure. In all these studies, FDSC has proved to be a powerful tool allowing easy access for small specimens at a specific area of a sample and bridging of the gap between slow heating rates of classical calorimetry with the flash rates seen for reactions after ignition. In this project, the newly developed methodology for FDSC will be exploited in order to address the following objectives: (a) characterize the nature of the observed separation of time scale for interdiffusion, (b) determine the effect of 3D complex morphologies on the reaction kinetics for a fixed bilayer periodicity and composition, (c) determine the effect on the reaction sequence and reaction kinetics of the addition of B2-NiAl interlayers to Ni/Al multilayers, (d) the same as above, for Ru/Al multilayers bearing the addition of B2-RuAl interlayers, and (e) extend and apply the FDSC calibration methods for thermal lag and sample mass for complex morphologies of free-standing films in comparison to multilayers directly sputtered on the FDSC sensor. The project plans calorimetric studies of more and more complex morphologies, including 3D morphologies and various complex stacking sequences.

该项目的目的是解决有关形态对形态学设计的反应反应热力学和动力学的影响的开放问题。由于与财团合作伙伴的合作，先前的项目能够对具有不同级别的复杂几何形状的多层进行量热量研究，并测量在热冲击后的点火过程中测量热量。首次使用五个数量级的加热速率从0.1 k/s到10000 k/s检测到反应的活化能。通过将差异扫描量热法（DSC）与新型闪光量热法（FDSC）相结合，这是可能的。 A novel FDSC methodology to measure free-standing multilayer films was developed and applied, among others to three different systems: (1) planar nanoscaled Ni/Al multilayers with different bilayer periodicities and compositions where a two-stage mechanism for interdiffusion prior to reaction was observed, (2) the synthesis of a B2-structured high entropy alloy films using Ni/Al multilayers as a heat source where the在FDSC中原位观察到反应的点火，（3）由Ni/Al多层样品通过高压扭转混合的Ni/Al多层样品的形成，在那里我们表明FDSC可用于选择性地研究具有多种微型结构的单个样品的各个样品的材料反应性。在所有这些研究中，FDSC已被证明是一种强大的工具，可以轻松访问样品的特定区域的小样本，并在经典量热法的缓慢加热速率之间的间隙以及点火后的反应后看到的闪光速率桥接。 In this project, the newly developed methodology for FDSC will be exploited in order to address the following objectives: (a) characterize the nature of the observed separation of time scale for interdiffusion, (b) determine the effect of 3D complex morphologies on the reaction kinetics for a fixed bilayer periodicity and composition, (c) determine the effect on the reaction sequence and reaction kinetics of the addition of B2-NiAl interlayers to Ni/Al多层（d）与上述相同，用于添加B2 Rual Interamayers的Ru/Al多层，以及（e）扩展并应用FDSC校准方法，用于热滞后和样品质量，用于与直接在FDSC传感器上溅射的多层相比，自由型膜的复杂形态。该项目计划对越来越复杂的形态的量热研究，包括3D形态和各种复杂的堆叠序列。