10 Feb 2021
Uppsala University and Graphmatech report breakthrough in printability of copper for laser additive manufacturing.Uppsala University, Sweden, in collaboration with neighbouring graphene materials company Graphmatech, have made what they call a breakthrough in the printability of copper for laser additive manufacturing (AM).
The partners say they have achieved this by “significantly lowering the reflectivity of copper powder to achieve more dense printed parts.”
In recent years, additive manufacturing of metals has seen rapid uptake across a range of industries due to its ability to produce customized and complex designs on demand, as well as offering more sustainable manufacturing with reduced waste and lower material requirements.
However, some metals, including pure copper, have proven a challenge due to their high reflectivity. At the wavelengths commonly used in laser powder bed fusion (the dominant technology in metal AM), only a small part of the energy is absorbed by the material, resulting in low density printed parts.
“By modifying the surface of the copper powder using Graphmatech’s patented graphene technology, we have successfully reduced the reflectance by up to 67%,” explained Graphmatech CEO Dr Mamoun Taher.
“The incorporated graphene also survives the printing process to positively impact the density of the printed copper-graphene parts, significantly reducing their porosity.”
The research is being undertaken by Professor Ulf Jansson’s research group at Ångström Laboratory, Uppsala University, with PhD student Simon Tidén having recently been awarded a poster prize at the Swedish Arena for Additive Manufacturing of Metals Conference for the group's achievement.
Professor Jannson commented, “the new process developed to coat metal powder with graphene opens up some interesting perspectives for the design of new materials in various applications.”
Scaling up process
Workers at Graphmatech are now actively scaling up this technology, having already made significant advances in other graphene-metal composites and coated powders for additive manufacturing with project partners, due to the potential for graphene in enhancing the processability of powders and the properties of printed parts.
Graphmatech AB is a privately held graphene materials technology company, focused on developing next generation materials. A Swedish company, it comprises a diverse, international team spanning nine nationalities. Its investors include ABB Technology Ventures, Walerud Ventures, EIT InnoEnergyand Almi Invest GreenTech Fund.