Electrophoretic and Electrolytic Deposition of Ceramic Particles on Porous Substrates

Abstract

Electrophoretic deposition of ceramic particles and their penetration into the pores of graphite and a 2D C-C composite were demonstrated and studied theoretically and experimentally for colloidal SiO2, SiC, Si3N4, Al2TiOs and HfTiO4. The effect of deposition parameters (field intensity, particle concentration, ratio of dielectric constant/viscosity of fluid) on the amount of induced material was experimentally studied. Penetration depth of particles as function of above parameters was analyzed theoretically. Penetration is enhanced by large Peclet numbers and is therefore higher in aqueous suspensions, while coating morphology is better in propanol suspensions. Optimal conditions for coverage and penetration in a two-stage process were therefore determined. Subsequent deposition of two layers was demonstrated and studied for Si3N4 on Al2TiO5 and SiC on a glass ceramic

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Document Details

Document Type
Technical Report
Publication Date
Sep 30, 1992
Accession Number
ADA265141

Entities

People

  • L. Gal-or
  • S. Haber
  • S. Liubovich

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Body Weight
  • Carbon Carbon Composites
  • Ceramic Materials
  • Chemical Reactions
  • Chemical Synthesis
  • Chemistry
  • Coatings
  • Composite Materials
  • Dielectric Permittivity
  • Electrodeposition
  • Graphitic Materials
  • Materials
  • Materials Engineering
  • Materials Processing
  • Materials Science
  • Oxidation
  • Oxidation Resistance

Readers

  • Fluid Dynamics.
  • Semiconductor Device Technology
  • Surface Engineering/Surface Coating Technology.