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Journal of Materials Science

, Volume 29, Issue 23, pp 6241–6248 | Cite as

Electrochemical ZrO2 and Al2O3 coatings on SiC substrates

  • R. Chaim
  • G. Stark
  • L. Gal-Or
  • H. Bestgen
Article

Abstract

SiC was electrochemically coated with ZrO2 and with Al2O3 from 0.1 m aqueous solutions of metal-nitrate-hydrates with ethanol added. Amorphous zirconia and alumina coatings were formed with current densities from 10 to 70 mA cm−2, and deposition durations of 1–60 min. The as-deposited coatings contained microcracks caused by drying shrinkage. Sintering of zirconia at 900 °C for 1 h and of alumina at 1200 °C for 2 h in air was accompanied by crystallization to a mixture of tetragonal and monoclinic phases in the former and to α-alumina in the latter. The absence of intermediate phases between the coatings and the substrates and the good adherence of the sintered coatings indicate the high-temperature stability of these coatings.

Keywords

Polymer Alumina Crystallization Aqueous Solution Zirconia 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1994

Authors and Affiliations

  • R. Chaim
    • 1
  • G. Stark
    • 1
  • L. Gal-Or
    • 1
  • H. Bestgen
    • 2
  1. 1.Department of Materials EngineeringIsrael Institute of Metals Technion- Israel Institute of TechnologyHaifaIsrael
  2. 2.Hoechst AGFrankfurtGermany

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