Regarding the realization of power producing magnetic confinement nuclear fusion devices, the development and qualification of suitable materials for highly loaded plasma-facing components (PFCs) is considered a fundamental challenge. Tungsten is a promising candidate material for the plasma-facing armour of such PFCs, mainly due to its low physical sputtering as well as its low hydrogen isotope retention. As a heat sink material in PFCs, copper and its alloys are a suitable choice due to their high thermal conductivity and ductility. However, joining these two materials is a challenge as there is a significant difference regarding their thermal expansion coefficients. Under high heat flux loading, as expected in PFCs of future magnetic confinement fusion reactors, substantial mechanical stresses do hence develop at the joining interface, posing a component failure risk. In this contribution, we present a class of tungsten–copper composites based on additively manufactured tungsten that aim at mitigating this technological challenge. The experimental characterization of thermomechanical properties of these composites produced by additive manufacturing and subsequent liquid copper infiltration is described. Both tensile and compression test results are presented, as well as measurements of thermal diffusivity and thermal expansion.