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Max Phase Materials And Coatings For High Temperature Heat Transfer Applications
Abstract
Molten salts have been used as heat transfer fluids in a variety of applications within proposed Gen IV nuclear designs and in advanced power system such as Concentrating Solar Power (CSP). However, operating at elevated temperatures can cause corrosion in many materials. This work developed coating technologies for MAX phase materials on Haynes-230 and characterized the corrosion of the coatings in the presence of commercial MgCl<sub>2</sub>-KCl molten salt. Cold spraying of Ti<sub>2</sub>AlC and physical vapor deposition (PVD) of Ti<sub>2</sub>AlC or Zr<sub>2</sub>AlC were tested to determine the most effective form of coating MAX phases on structural substrates. Corrosion testing at 850°C for 100 hrs showed that 3.9 μm Ti2AlC by PVD was slightly protective while 117 μm Ti<sub>2</sub>AlC by cold spray and 3.6 μm Zr<sub>2</sub>AlC by PVD were completely protective. None of the tests showed decomposition of the coating (Ti or Zr) into the salt