High-temperature oxidation-resistant NiCr/Al DUPLEX coating on CT3 STEEL SUBSTRATE

Ly Quoc Cuong, Nguyen Van Tuan, Pham Thi Ha, Pham Thi Ly, Vo An Quan, Dao Bich Thuy, Nguyen Tuan Anh, Le Thu Quy

Abstract


The oxidation resistance property of NiCr/Al duplex coating system has been evaluated at 800oC during retention times of 1.5; 3; 4.5 and 6 hours. After the oxidation test, SEM-EDS data indicated the diffusion of aluminum into the NiCr coating, whereas  XRD patterns revealed the appearance of new phases (Al3Ni2, Al2O3). In addition, an increase in micro-hardness (up to 518 - 842 Hv) was obtained after oxidation test. These obtained findings indicated that NiCr/Al coating had higher oxidation resistance than NiCr coating.


Keywords


Thermal spray; combined coating; NiCr/Al alloy coating; oxidation resistance

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References


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DOI: https://doi.org/10.15625/2525-2518/58/1/13483 Display counter: Abstract : 44 views. PDF : 1 views.

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