S.L.Yang
,
Fuhui Wang
,
S.L.Zhu
金属学报(英文版)
The oxidation behavior of a magnetron sputtered nanocrystalline NiAl coating wasinvestigated at 1000℃ in air. Comparing with cast NiAl and NiAl-0.1at.%Y alloysreveals influences of nanocrystallization as well as yttrium addition on the oxidationbehavior of NiAl. Results show that a phase transformation from metastable θ-Al2O3to stable α-Al2O3 occurred in scales, which was accelerated by the microcrystallizationand retarded by the addition of Y. The addition of Y as well as the nanocrystallizationreduced the void formation at the interface between the scale and the substrate.
关键词:
S.J.Geng
,
Fuhui Wang
,
S.L.Zhu
金属学报(英文版)
The sputtered nanocrystalline coating of K38G alloy was obtained by magnetron sput-tering. The hot corrosion behaviors of cast K38G alloy and its sputtered nanocrys-talline coating by pre-deposited 75wt%Na2SO4+25wt%K2SO4 at 900℃ were studied.The results indicated the occurrence of internal sulfidation in the cast K38G alloy withpre-deposited sulfattes of 0.8 and 3.0mg/cm2. However, the internal sulfidation wasnot observed in the coating with pre-deposited 0. 8mg/cm2 sulfate. The hot corrosionresistance of K38G alloy was clearly enhanced through nanocrystallinzation, althoughthe internal sulfides were still formed for the coating with sulfate deposit of 3mg/cm2.The relevant hot corrosion mechanism was also discussed.
关键词:
K38G
,
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,
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