Accession Number:

ADA265141

Title:

Electrophoretic and Electrolytic Deposition of Ceramic Particles on Porous Substrates

Descriptive Note:

Final rept. 1 Mar 1988-30 Nov 1992

Corporate Author:

TECHNION RESEARCH AND DEVELOPMENT FOUNDATION LTD HAIFA (ISRAEL)

Personal Author(s):

Report Date:

1992-09-30

Pagination or Media Count:

282.0

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 constantviscosity 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

Subject Categories:

  • Ceramics, Refractories and Glass
  • Coatings, Colorants and Finishes
  • Manufacturing and Industrial Engineering and Control of Production Systems

Distribution Statement:

APPROVED FOR PUBLIC RELEASE