Design of novel interlayers in W-W diffusion-bonded joints for large nuclear shielding components applications

用于大型核屏蔽部件应用的 W-W 扩散粘合接头中新型中间层的设计

• 批准号: 2898257
• 金额: --
• 依托单位: CRANFIELD UNIVERSITY
• 依托单位国家: 英国
• 项目类别: Studentship
• 财政年份: 2023
• 资助国家: 英国
• 起止时间: 2023 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=studentship-2898257
• 关键词: Design; novel; interlayers; diffusion; bonded

The environment within nuclear fusion reactors is very demanding. The fusion reaction between deuterium and tritium releases approximately 16.6MeV of energy within a plasma, subdivided between a high-energy neutron (~14MeV) and a charged helium nucleus. Neutron irradiation is particularly damaging to the high temperature superconductors (HTSs) in the reactor. A shield, made of W material, is therefore manufactured with the aim to protect the HTS from neutron radiation, as well as thermal fatigue loads from the plasma. Joining W shielding components has proven challenging, due to formation of brittle intermetallic phases and high residual stresses. Consequently, a successful joining methodology has not yet been developed. This 3-year PhD position will develop an effective joint for W components, utilising a coating interlayer deposited by Physical Vapour Deposition and diffusion bonding as joining method. The chemistry of the coating interlayer and diffusion bonding parameters will be elegantly designed by an Integrated Computational Material Engineering (ICME) approach, through a combination of high-throughput thermodynamic predictions (Thermo-Calc, CALPHAD), Finite Element Analysis (Abaqus) and experimental validations. The work will involve a tight collaboration with the UK Atomic Energy Authority (UKAEA), the industrial sponsor, throughout the project.

核融合反应堆内的环境非常苛刻。氘和trium虫之间的融合反应在血浆内释放约16.6mev，在高能量中子（〜14mev）和带电的氦核之间细分。中子辐照对反应堆中的高温超导体（HTSS）尤其破坏。因此，由W材料制成的屏蔽层旨在保护HTS免受中子辐射以及血浆中的热疲劳负荷。由于形成了脆性的金属间相和高残余应力，因此将W屏蔽组件连接起来已被证明是具有挑战性的。因此，尚未开发成功的加入方法。这个3年的博士学位位置将使用通过物理蒸气沉积和扩散键作为加入方法沉积的涂层层中的W组成部分。通过高通量热力学预测（Thermo-CALC，Calphad），有限元分析（ABAQUS）和实验验证的组合，将通过集成的计算材料工程（ICME）方法来优雅地设计涂料中层和扩散键合参数的化学性质。整个项目中，这项工作将涉及与工业赞助商英国原子能管理局（UKAEA）进行紧密合作。