Microscale innovations extend the lifespan of wind turbine blades

Wind turbine blades must withstand extreme forces for decades while at the same time meeting stringent circularity requirements. Two new research projects from TU Delft demonstrate that microscopic modifications to material structures can double their lifespan and reduce CO₂ emissions.

The innovations, published in  Advanced Science and Advanced Materials, are part of the NWO-funded LICHEN BLADES programme and focus on erosion-resistant coatings and reinforced flax fibres.

Tackling erosion with bio-inspired coatings

The tips of wind turbine blades are particularly vulnerable to erosion caused by rain and dust. PhD candidate Natalia Guevara Sotelo developed a solution using ceramic ‘platelets’ in a polyurethane coating. Initially, a uniform layer of these microscopically thin ceramic particles appeared to improve erosion resistance, but in practice it actually reduced performance due to increased stiffness and internal stresses.

The answer was a gradient structure: softer at the surface exposed to rain and more strongly reinforced closer to the glass-fibre substrate. This approach, inspired by natural organisms such as insects, doubled the time before erosion became visible. Dr Julie Teuwen, supervisor of the project, emphasises that the innovation not only extends the lifespan of the blades, but also reduces maintenance costs and preserves aerodynamic efficiency.

Flax fibres strengthened through bacterial biomineralisation

Glass fibres still dominate wind turbine blades, but flax fibres offer a more sustainable alternative, with a lower carbon footprint and better recyclability. Until now, however, their mechanical properties, including compressive strength and toughness, have been insufficient. PhD candidate Deniz Sayinbas addressed this problem using bacterial biomineralisation: flax fibres are treated in a solution containing bacteria that cause dolomite particles to grow directly on the fibre surface.

These particles roughen the surface and form bridges between neighbouring fibres, similar to the structure of seashells. The result is a material that is more resistant to small deformations, has greater compressive strength and distributes forces more evenly. Prof. Kunal Masania, also a supervisor of the project, sees the technique as potentially playing a key role in the transition towards biobased composites in the wind energy sector.

Circular designs for multiple life cycles

The LICHEN BLADES consortium, led by TU Delft, aims to develop wind turbine blades that not only last longer but are also fully circular. The projects build on earlier research, including the PhD thesis of Jelle Joustra, which examined the repurposing of existing turbines and material considerations for future designs.

The consortium, which includes partners such as Bcomp, Suzlon Energy, Heijmans Infra and DNV, is focusing on carbon-storing materials, low-waste production processes and advanced coatings. At the end of their service life, the blades should be reused as high-quality construction components, ensuring that the carbon stored in them continues to be put to use. This approach is in line with Europe’s ambition to make the wind energy sector fully circular.

Impact on European autonomy and the economy

The innovations developed in Delft have direct implications for Europe’s strategic autonomy in green technology. Extending the lifespan of turbine blades and reducing maintenance costs decreases the need for new raw materials. In addition, biobased materials such as reinforced flax fibres offer an alternative to import-dependent glass fibres, strengthening the resilience of European supply chains.

The LICHEN BLADES project shows that innovations at the microscale can lead to significant improvements in sustainability and performance without compromising functional requirements. For policymakers and investors, it underlines the need to invest in circular designs and new business models that retain the value of materials for as long as possible.