Pulsed-DC electrophoretic deposition (EPD) of aqueous alumina suspension for controlling bubble incorporation and deposit microstructure

Laxmidhar Besra, Tetsuo Uchikoshi, Tohru Suzuki, Yoshio Sakka

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Electrophoretic deposition (EPD) from aqueous suspension generally forms deposit containing incorporated bubbles because of evolution of gases at electrodes due to electrolysis of water. We have demonstrated here that application of pulsed voltage /current instead of continuous DC enables controlling the amount of bubble incorporation and obtain bubble-free deposits during EPD of aqueous suspension. The yield and bubble incorporation decreased progressively with decrease in size of the applied pulse. A characteristic band of deposition window was found in the plot of voltage/current vs. pulse width within which smooth and bubble-free deposits are obtained. The window is wider at low applied voltages/currents than at higher voltages/currents implying that it is more easier to control the pulsed EPD at lower applied voltages and/currents. No deposition occurred below the window whereas deposits with incorporated bubbles formed above the window. Suppression of bubbles with decreasing pulse size was attributed to decrease in the amount of hydrogen evolved per pulse and verified by monitoring the gain in weight of palladium (Pd) electrode used as cathode during electrolysis of water.

Original languageEnglish
Pages (from-to)39-44
Number of pages6
JournalKey Engineering Materials
Volume412
DOIs
Publication statusPublished - 2009 Aug 18
Externally publishedYes

Fingerprint

Aluminum Oxide
Suspensions
Alumina
Deposits
Microstructure
Electric potential
Electrolysis
Electrodes
Water
Palladium
Hydrogen
Cathodes
Gases
Monitoring

Keywords

  • Aqueous EPD
  • Bubble suppression
  • Electrophoretic deposition
  • Pulsed DC

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Pulsed-DC electrophoretic deposition (EPD) of aqueous alumina suspension for controlling bubble incorporation and deposit microstructure. / Besra, Laxmidhar; Uchikoshi, Tetsuo; Suzuki, Tohru; Sakka, Yoshio.

In: Key Engineering Materials, Vol. 412, 18.08.2009, p. 39-44.

Research output: Contribution to journalArticle

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