Wed, 19 April, 2023
Findings from the GEOHEX project have been published as a paper in the Journal of Non-crystalline Solids.
The paper, ‘Structural stability and oxidation resistance of amorphous TaSi-based ternary alloy coatings,’ was co-written by representatives from Grein Research and the University of Iceland.
Amorphous metal coatings show a great potential for corrosion protection, but it can be challenging to find alloy compositions that form a stable amorphous structure.
Combinatorial magnetron sputtering and X-ray analysis can be used to map out the phase space of TaSiM (M = Al, Cr, Fe, Ti) alloys and identify amorphous compositions.
The paper demonstrates how amorphous coatings are yielded at atomic percentages above 10-15 at.% and TaSiAl coatings are stable when annealed in air up to and including 550 °C whereas TaSiFe, TaSiCr and TaSiTi remain amorphous up to and including 750 °C.
The research also shows that Ta35Si15Cr50 is almost unchanged at that temperature, and has a stable surface oxide shell less than 20 nm in thickness at 650 °C.
The stability of these materials at high temperatures means that they could be suitable for use as anti-corrosion coatings in high temperature applications, such as in geothermal.
You can see the paper and discover the findings at Science Direct, here.
The GEOHEX project has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No 851917