Abstract: The Ni-Cr-Sc alloys were prepared by powder metallurgy technology and the effects of Sc for the alloys with different content Cr on the oxidation resistance were studied at 1 000 ℃. The results show that: for Ni-xCr-ySc(x=5,15,25,35;y=0,1;mass fraction,the same below) alloys, the addition of Sc element increases the area of oxide scales/substrate,and the oxide scales penetrates deep into the substrate,the both improves the bonding force between the oxide scales and the substrate.The Sc element can promote the formation of Cr2O3 and NiCr2O4,provide the nucleation particles of oxide scales which refine the grains ,and protect the integrity of the oxide scales.The element of Sc is beneficial to the formation of NiCr2O4 which reduce the oxidation rate,meanwhile the element of Sc increase the grain boundaries as diffusion channels which accelerate the oxidation rate.
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