Reinforced sol-gel thermal barrier coatings and their cyclic oxidation life

  • Dehnavi V
  • Pin L
  • Ansart F
 et al. 
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Abstract

Thick alumina coatings were synthesized on 7075 Al-alloy substrates through the microarc oxidation (MAO) route. Different oxidation times namely 1, 3, 5, 10, 20 and 30 min were employed and the coated samples were subjected to coating thickness and surface roughness measurements. Phase composition of the surface layers of the coatings was evaluated through X-ray diffraction. In addition, the surface features of the coatings were studied using scanning electron microscopy. Influence of coating time on the kinetics of coating formation, surface roughness, microhardness, number and size of the microarc discharge channels was investigated. On the basis of the experimental results, a phenomenological mechanism for the formation of the alumina-based ceramic coatings during the MAO process has been proposed. © 2002 Elsevier Science B.V. All rights reserved.

Author-supplied keywords

  • Alpha alumina
  • Alumina
  • Alumina coatings
  • Aluminium
  • Artificial joints
  • Automation
  • Breakdown
  • Catalyst
  • Ceramic coatings
  • Ceramics
  • Current density
  • Current efficiency
  • Dimensional matching
  • Direct current (DC)
  • Discharge channels
  • Dispersible powder
  • Electrolyte
  • Electrolyte concentration
  • Electrolytes
  • Films
  • Frequency response
  • Hot-dip aluminum
  • MAO coating mechanisms
  • Methylene blue
  • Micro arc oxidation
  • Micro-arc oxidation
  • Microarc oxidation
  • Microarc oxidation (MAO)
  • Microarc oxidation coatings
  • Microarc plasma
  • Microdischarge
  • Microhardness
  • Nanoindentation
  • Outward-inward growth behavior
  • Oxidation
  • Oxide ceramic coating
  • Oxidized surfaces
  • Phosphate solution
  • Photocatalysis
  • Plasma electrolysis
  • Plasma electrolytic oxidation
  • Porous
  • Porous structure
  • Pulsed plasma
  • Real time imaging
  • Reinforcement
  • Residual stresses
  • Silicate solution
  • Sol-gel
  • Steel substrate
  • Thermal barrier coating
  • Tribological behaviour
  • Tungsten oxide
  • X-ray diffraction
  • XRD Sin2Ψ method
  • a ceramic coating containing
  • abstract
  • aluminium alloy
  • and koh
  • ceramic coating
  • coating
  • epma
  • in a solution of
  • in this paper
  • investigated by xrd
  • k 2 zrf 6
  • m-zro 2
  • mao
  • micro-arc oxidation
  • microarc oxidation
  • of the coating were
  • t-zro 2
  • the coating consists of
  • the composition and structure
  • the results show that
  • zirconia
  • zirconia was produced by
  • zirconium dioxide
  • α-al 2 o 3

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Authors

  • V. Dehnavi

  • Lisa Pin

  • Florence Ansart

  • Jean Pierre Bonino

  • Yannick Le Maoult

  • Vanessa Vidal

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