Eggshells help produce stronger and harder magnesium alloys
(Photo: North Carolina State University)
2 October 2026 – Researchers at North Carolina State University have developed a method for using eggshells to manufacture strong, lightweight magnesium alloys. The approach offers a potential high-value application for a common waste material.
Eggshells consist of approximately 95 percent calcium carbonate. Calcium can improve the mechanical properties of magnesium, but conventional calcium-based materials are generally produced from mineral resources through energy-intensive processing.
In the new method, finely ground eggshells are placed inside a magnesium block. The metal is then processed under high pressure using a rotating tool. Friction and mechanical deformation mix the particles into the magnesium and promote reactions that form calcium-containing compounds, strengthening the material’s structure.
The resulting magnesium alloy has improved strength and hardness. Such lightweight materials are useful for applications including vehicles, electronics and aerospace equipment.
The researchers believe the technique could reduce the need for newly extracted raw materials and lower manufacturing energy requirements. Further development will be necessary before the process can be adopted on an industrial scale.
The research has been published in ScienceDirect under the title ‘Circular manufacturing of Mg–eggshell composites: Transforming biogenic waste into functional reinforcements’.
