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Science & Tech.
Mahesh

11/05/22 07:49 AM IST

New low-cost iron aluminide coatings

In News 
  • Scientists have developed low-cost Fe-based intermetallic powders that can be used as a corrosion-resistant coating for materials exposed to harsher environments like high temperature in thermal power plants where oxidation, corrosion, and wear and tear takes place simultaneously. 
Details 
  • Wear and corrosion cause major damage over a range of service temperatures.
  • Hence, there is a need to protect the component surface with a suitable material for enhanced economic viability.
  • Such surface coating on a turbine blade can enhance the service life and hence increases the operation hours of turbine.
  • ARCI has developed gas atomized Fe aluminide powder and deposited it on mild steel substrates by DSC without any cracks or spalling.
  • The coatings have demonstrated 4 times increased corrosion resistance in the aqueous corrosive media than the mild steel.
  • The coatings exhibited better corrosion resistance when Cr and Al are in a solid solution with Fe than in the Fe –rich phases.
  • The coatings have demonstrated an increased wear resistance by 30-40% than the mild steel under solid particle erosion wear mode, implying that FeAlCr coatings can be used for high-temperature erosion resistance applications. 
Source-PIB 

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