RMIT University researchers develop floating 3D-printed titanium

Researchers at RMIT University in Australia have developed a novel floating metal structure using 3D-printed titanium. This breakthrough addresses the historical challenge of preventing water from entering the open pores of lightweight metal structures, which typically causes them to sink.

To achieve buoyancy, the team filled hollow titanium rods with polyurethane foam. This method ensures the structure remains afloat even if it suffers cracks or damage. The researchers introduced a new metric called ‘Skeletal Density’ to determine buoyancy, which focuses on the parts of the structure that water cannot penetrate.

At an equivalent density, this titanium structure is 70 percent stronger than stainless steel or high-density polyethylene commonly used in marine applications. The technology holds potential for use in marine sensors, floating platforms, and docks. Future research will focus on scaling the samples and testing their performance in deep-sea environments.