Additive Manufacturing of High Melting Point Metals

Additive manufacturing of high melting point metals, often referred to as refractory metals, encompasses techniques that build complex geometries layer by layer to harness the exceptional thermal and mechanical properties of elements such as tungsten, molybdenum, tantalum, niobium and rhenium. These metals pose unique challenges: their extreme melting temperatures demand high-energy heat sources, their high thermal conductivity leads to rapid heat dissipation and steep thermal gradients, and their intrinsic brittleness or ductile-to-brittle transition behaviour can induce cracking. Common approaches include laser powder bed fusion, directed energy deposition and emerging vat photopolymerisation routes that enable fine feature control. Research efforts focus on powder quality and feedstock preparation, process parameter optimisation, preheating strategies, alloying to improve ductility, post-processing heat treatments and novel sintering schedules. Applications span aerospace engine components, plasma-facing elements in fusion reactors, medical collimators for nuclear imaging and microarchitected metamaterials. Recent advances point to integrated process chains that combine high-resolution shaping with tailored thermal management to achieve dense, crack-free parts with reliable performance in extreme environments.

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Additive Manufacturing of High Melting Point Metals publication trend

The graph below shows the total number of articles in additive manufacturing of high melting point metals across all publications each year (not limited to Nature Index journals).

Technical terms

Refractory metal: A metal with exceptionally high melting point and thermal stability, typically including tungsten, molybdenum, tantalum, niobium and rhenium.

Laser powder bed fusion (LPBF): An additive manufacturing process in which a laser selectively melts successive layers of metal powder to build three-dimensional parts.

Directed energy deposition (DED): A process that feeds powder or wire into a focused energy source, such as a laser or electron beam, to deposit and fuse material in a directed manner.

Vat photopolymerisation: An additive technique that uses light to cure a photoreactive resin loaded with metal precursors, followed by thermal steps to yield a metal part.

Ductile-to-brittle transition temperature (DBTT): The temperature below which a material exhibits brittle fracture rather than ductile behaviour under stress.

Sintering: A heat-treatment process that densifies powder compacts by atomic diffusion without fully melting the material.

References

1. Fabrication of High‐Density Microarchitected Tungsten via DLP 3D Printing. Advanced Science (2024).
2. Laser-based additive manufacturing of refractory metals and their alloys: A review. Additive Manufacturing (2024).
3. Rapid screening of single phase refractory alloys under laser melting conditions. Materials & Design (2024).