A research team at the Karlsruhe Institute of Technology (KIT) has developed a refractory metal alloy with previously unmatched properties: it is deformable at room temperature, has a melting point of around 2,000 °C, and remains resistant to oxidation.
High-temperature-resistant metallic materials are required for aircraft engines, gas turbines, X-ray equipment, and many other technical applications. The most robust against high temperatures are the so-called refractory metals — such as tungsten, molybdenum, or chromium — whose melting points are around 2,000 °C or higher.
However, in practice, these materials quickly reach their limits: at room temperature, they are brittle, and from about 600–700 °C they oxidize rapidly in the presence of oxygen, which means they can often only be used under vacuum conditions.
Therefore, nickel-based superalloys have so far been the dominant material for components operating in high-temperature air or combustion gas environments. These, however, are typically usable only up to about 1,100 °C — limiting efficiency potential.
A Technological Breakthrough: Chromium–Molybdenum–Silicon Alloy
Against this backdrop, the research group led by Professor Martin Heilmaier at KIT — within the DFG-funded Research Training Group “Materials Compounds from Composite Materials for Applications in Extreme Conditions” (MatCom-ComMat) — has developed a new alloy based on chromium, molybdenum, and silicon.
Together with Dr. Alexander Kauffmann (now Professor at Ruhr University Bochum), the team succeeded in creating an alloy that is deformable at room temperature, melts at around 2,000 °C, and shows a significantly lower oxidation rate in the critical temperature range compared to conventional refractory alloys.
“It is deformable at room temperature, melts only at about 2,000 °C, and oxidizes slowly even in the critical temperature range. This makes components feasible for operating temperatures significantly above 1,100 °C.” – Alexander Kauffmann
Greater Efficiency, Lower Consumption
An increase of 100 °C in turbine operating temperature can reduce fuel consumption by around 5% — an effect particularly relevant for aviation, where fully electric long-haul aircraft are unlikely even in the distant future. Stationary gas turbines could also operate more efficiently and with lower CO₂ emissions using such materials.
Nevertheless, Heilmaier emphasizes: “Many development steps are still necessary before the alloy can be used industrially. However, we have achieved an important milestone — one that research groups worldwide can now build upon.”
Original Publication & Outlook
The research results were published under the title “A ductile chromium–molybdenum alloy resistant to high-temperature oxidation” (Nature, 2025).
While the groundwork has been laid, industrial application remains a future goal — yet the foundation has been set to redefine the use of metals under extreme conditions in the long term.
