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- W2356721622 abstract "Five types of Cr-Nb alloys with different phase constitutions were fabricated by mechanical alloying and hot pressing.The influence of phase constitution on the oxidation behavior of the hot pressed Cr-Nb alloys were investigated at 950?1 200 ℃ in air.The results show that Cr phase improves the oxidation resistance of Laves phase NbCr2 based compounds at 950 ℃.However, Nb phase deteriorated the oxidation resistance, moreover, Nb phase results in a catastrophic failure during oxidation.SEM and XRD analyses indicate that the CrSS phase(Cr-2.5Nb) exhibits selective Cr oxidation and forms a continuous chromia scale.However, single phase alloys of Cr-33Nb and two phase alloys of Cr-18.5Nb exhibit that internal and external oxidation happen simultaneously for the active element chromium, and their oxide scales are made with a multi-layered scale consisting of an outer layer being a porous, loosely adherent Cr2O3 layer and the inner layer being of CrNbO4.With the exposure temperature increasing up to 1 200 ℃, the oxidation resistance of Cr-rich Cr-Nb alloys decreases due to the continuous vaporization of CrO3 in the oxide scale.Therefore, it is necessary to apply surface protective coatings on Cr(or Nb)-NbCr2 alloys to promote their application in the high temperature environment." @default.
- W2356721622 created "2016-06-24" @default.
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- W2356721622 date "2008-01-01" @default.
- W2356721622 modified "2023-09-25" @default.
- W2356721622 title "Effect of phase constitution on oxidation behavior of Cr-Nb alloys" @default.
- W2356721622 hasPublicationYear "2008" @default.
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