AMA：拉夫堡大学能源领域：增材制造与聚变能源材料探索

When most engineers think about the challenges of nuclear fusion, they think about plasma temperatures of 50 million degrees Celsius, magnetic containment, and tritium fuel cycles. Moataz Attallah, newly appointed Dean of the School of Aeronautical, Automotive, Chemical, and Materials Engineering at Loughborough University, thinks about something far more fundamental: what the reactor walls are made of, and how to build them.

当大多数工程师思考核聚变挑战时，他们关注的是5000万摄氏度的等离子体温度、磁约束和氚燃料循环。而拉夫堡大学航空、汽车、化学与材料工程学院新任院长Moataz Attallah关注的则是一个更为根本的问题：反应堆内壁用什么材料制造，以及如何建造它们。

Speaking from his new role, having moved his research group the Advanced Materials Processing Laboratory (AMPLab) from the University of Birmingham, where the research was conducted, Attallah presented findings from a major UK-funded program involving Metamorphic AM and private fusion company Tokamak Energy. The work focused on one of the most stubborn unsolved problems in fusion engineering: finding a material that can survive the inside of a reactor, and a manufacturing process that can actually build it.

Attallah在其新职位上发言，他的研究团队——先进材料加工实验室（AMPLab）——已从原先开展研究的伯明翰大学迁至拉夫堡大学。他展示了英国一项重大资助项目的研究成果，该项目涉及Metamorphic AM公司与私营聚变公司Tokamak Energy的合作。研究聚焦于聚变工程中最顽固的未解难题之一：寻找一种能在反应堆内部存活下来的材料，以及一种能够实际制造该材料的工艺。

The physics of fusion, Attallah argues, is largely understood. The materials science is not. The walls of a fusion reactor must withstand extreme heat flux, constant radiation, and thermal shock — conditions that eliminate most conventional engineering materials immediately. The candidates that remain are refractory metals: tungsten, molybdenum, tantalum, niobium, and rhenium. Each has a melting point above 2,000 degrees Celsius. Each is also deeply problematic to work with.

Attallah认为，聚变的物理学原理已基本明晰，但材料科学尚未解决。聚变反应堆的壁面必须承受极端热通量、持续辐射和热冲击——这些条件会立即淘汰大多数传统工程材料。剩下的候选材料是难熔金属：钨、钼、钽、铌和铼。每种材料的熔点都超过2000摄氏度，但每种材料也都极难加工。

Oxygen is the main problem. Even trace amounts, as little as four parts per million, can dramatically reduce ductility and strength in tungsten. Refractory metals have a high affinity for oxygen, meaning that any manufacturing environment that is not rigorously controlled will compromise the material before it ever reaches a reactor. Compounding this, most refractory metals are not considered weldable, which in additive manufacturing terms is a warning sign, since weldability is broadly seen as a proxy for printability.

氧气是主要问题。即使是百万分之四的微量氧，也能显著降低钨的延展性和强度。难熔金属对氧有很高的亲和力，这意味着任何未经严格控制的制造环境都会在材料到达反应堆之前就使其性能受损。更复杂的是，大多数难熔金属被认为不可焊接——在增材制造术语中，这是一个警示信号，因为可焊性通常被视为可打印性的代名词。

The result is a materials challenge that sits at the intersection of metallurgy, manufacturing process control, and nuclear physics — and one that cannot be solved by any single discipline working alone.

结果是，这一材料挑战处于冶金学、制造过程控制和核物理学的交叉点，任何单一学科都无法独立解决。

AMPLab’s approach centered on laser powder bed fusion, using tungsten as the primary material but blending it with tantalum to address the oxygen problem. The logic was: tantalum oxides form more readily than tungsten oxides, meaning tantalum acts as a getter, effectively scavenging oxygen ions from the build chamber before they can damage the tungsten matrix. The result was a measurable reduction in the boundary segregation that leads to cracking.

AMPLab的方法以激光粉末床熔融为核心，以钨为主要材料，但将其与钽混合以解决氧气问题。其逻辑是：钽氧化物比钨氧化物更容易形成，这意味着钽充当吸气剂，在氧离子损害钨基体之前将其从建造室中有效清除。结果，导致裂纹的晶界偏析得到了可测量的减少。

The team designed complex cooling channel geometries — structures requiring highly turbulent internal flow to extract heat from reactor walls, geometries that would be impossible to manufacture by conventional means. Printed samples showed low porosity and, visually at least, were largely crack-free. Mechanical testing at Johns Hopkins University’s advanced high temperature mechanical testing system returned compressive strength values close to those of standard tungsten, an encouraging early result.

团队设计了复杂的冷却通道几何结构——这些结构需要高度湍流的内部流动以从反应堆壁面提取热量，且无法通过传统方法制造。打印出的样品显示出低孔隙率，并且至少在视觉上基本无裂纹。在约翰霍普金斯大学先进高温力学测试系统上的测试结果显示，其抗压强度值接近标准钨的水平，这是一个令人鼓舞的早期结果。

The process was not without limitations. Powder blending introduces inhomogeneity: in a 90/10 tungsten-tantalum mix, tantalum concentration was consistently lower at the base of the build and higher toward the top, affecting material properties across the part height. Simulation tools helped characterize this variation, but the challenge of achieving uniform composition in large-scale builds remains an active area of research.

该过程并非没有局限性。粉末混合会引入不均匀性：在90/10的钨钽混合物中，钽浓度在建造底部始终较低，而在顶部较高，这影响了零件高度方向上的材料性能。仿真工具有助于表征这种变化，但在大规模建造中实现均匀成分的挑战仍是一个活跃的研究领域。

While fusion energy materials may seem far removed from desktop 3D printing, the underlying principles are directly relevant to anyone working with high-performance materials. The same oxygen sensitivity that plagues tungsten in fusion reactors can affect titanium and aluminum alloys in your own prints. The same strategies — using getter materials, controlling build chamber atmosphere, optimizing powder blends — are being adapted for consumer-grade systems.

尽管聚变能源材料看似与桌面级3D打印相去甚远，但其基本原理与任何使用高性能材料的人直接相关。同样困扰聚变反应堆中钨的氧敏感性，也会影响——

For makers and engineers looking to push the boundaries of what’s possible with additive manufacturing, the lessons from Loughborough’s fusion research are clear: material science is the frontier. Whether you’re printing functional metal parts for robotics or custom tooling, understanding how your materials behave under stress is the key to unlocking new applications. Explore our collection of premium STL files to find designs that challenge your skills and materials.

As AMA: Energy 2026 approaches, the role of additive manufacturing in the energy sector is becoming increasingly clear. From nuclear fusion to advanced battery systems, 3D printing offers a path to geometries and material combinations that were previously impossible. The research at Loughborough University demonstrates that even the most extreme engineering challenges — building a reactor wall that can survive inside a star — can be addressed through clever material science and precise process control.

For the 3D printing community, this represents an exciting frontier. The techniques developed for fusion materials — oxygen scavenging, powder blending, simulation-driven process optimization — are already finding their way into commercial applications. As these technologies mature, the barrier to printing with refractory metals and other exotic materials will continue to fall, opening up new possibilities for makers, engineers, and industrial users alike.

Whether you’re designing cooling channels for a high-performance engine or experimenting with metal-filled filaments, the principles are the same: understand your material, control your environment, and design for the process. Browse our library of 3D printing models to find inspiration for your next ambitious project.

Looking for high-quality STL files? Browse our collection at 3dmis.com!

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