Published August 2014 | Version v1
Journal article Metadata-only

Hot corrosion behavior of Sc2O3–Y2O3–ZrO2 thermal barrier coatings in presence of Na2SO4 + V2O5 molten salt

Creators

  • 1. School of Metallurgy and Environment, Central South University, Changsha 410083 (China)
  • 2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083 (China)

Description

Graphical abstract: During corrosion, the ScYSZ coating exhibits superior chemical stability and improved phase stability in comparison with traditional YSZ coating. - Highlights: • Hot corrosion behavior of ScYSZ TBCs was investigated in Na2SO4 + V2O5 salt at 1000 °C. • The ScYSZ coating exhibits superior corrosion resistance in comparison with YSZ. • The destabilization of ScYSZ is attributed to mineralization effect of molten salt. - Abstract: Sc2O3, Y2O3-stabilized ZrO2 (ScYSZ) thermal barrier coatings (TBCs) were prepared on nickel-based superalloys by air plasma spraying. Hot corrosion behavior of the ScYSZ TBCs was investigated in presence of Na2SO4 + V2O5 salt at 1000 °C. Results show that the ScYSZ coating exhibits superior chemical stability and improved phase stability in comparison with traditional YSZ coating. During corrosion, the destabilization of ScYSZ is attributed to the deficiency of stabilizers resulted from the synergic mineralization effect of vanadium-containing compounds. The tetragonal-to-monoclinic phase transformation of zirconia can induce the formation of cracks in ScYSZ coating, which is responsible for the degradation of the TBCs

Availability note (English)

Available from http://dx.doi.org/10.1016/j.corsci.2014.04.001

Additional details

Identifiers

DOI
10.1016/j.corsci.2014.04.001;
PII
S0010-938X(14)00161-9;

Publishing Information

Journal Title
Corrosion Science
Journal Volume
85
Journal Page Range
p. 87-93
ISSN
0010-938X
CODEN
CRRSAA

INIS

Country of Publication
United Kingdom
Country of Input or Organization
International Atomic Energy Agency (IAEA)
INIS RN
46028024
Subject category
S36: MATERIALS SCIENCE;
Descriptors DEI
CERAMICS; CORROSION; CORROSION RESISTANCE; HEAT RESISTING ALLOYS; MINERALIZATION; MOLTEN SALTS; MONOCLINIC LATTICES; NICKEL; PHASE STABILITY; PHASE TRANSFORMATIONS; SCANDIUM OXIDES; SCANNING ELECTRON MICROSCOPY; SODIUM SULFATES; THERMAL BARRIERS; VANADATES; VANADIUM OXIDES; X-RAY DIFFRACTION; YTTRIUM OXIDES; ZIRCONIUM OXIDES
Descriptors DEC
ALKALI METAL COMPOUNDS; ALLOYS; CHALCOGENIDES; CHEMICAL REACTIONS; COHERENT SCATTERING; CRYSTAL LATTICES; CRYSTAL STRUCTURE; DIFFRACTION; ELECTRON MICROSCOPY; ELEMENTS; HEAT RESISTANT MATERIALS; MATERIALS; METALS; MICROSCOPY; OXIDES; OXYGEN COMPOUNDS; SALTS; SCANDIUM COMPOUNDS; SCATTERING; SODIUM COMPOUNDS; STABILITY; SULFATES; SULFUR COMPOUNDS; TRANSITION ELEMENT COMPOUNDS; TRANSITION ELEMENTS; VANADIUM COMPOUNDS; YTTRIUM COMPOUNDS; ZIRCONIUM COMPOUNDS

Optional Information

Copyright
Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.