Preparation and Characterization of High‐Temperature Thermally Stable Alumina Composite Membrane

Yue‐Sheng ‐S Lin, Anthonie J. Burggraaf

Research output: Contribution to journalArticle

157 Scopus citations

Abstract

A crack‐ and pinhole‐free composite membrane consisting of an α‐alumina support and a modified γ‐alumina top layer which is thermally stable up to 1100°C was prepared by the sol–gel method. The supported thermally stable top layer was made by dipcoating the support with a boehmite sol doped with lanthanum nitrate. The temperature effects on the microstructure of the (supported and unsupported) La‐doped top layers were compared with those of a common γ‐alumina membrane (without doping with lanthanum), using the gas permeability and nitrogen adsorption porosimetry data. After sintering at 1100°C for 30 h, the average pore diameter of the La‐doped alumina top layer was 17 nm, compared to 109 nm for the common alumina top layer. Addition of poly(vinyl alcohol) to the colloid boehmite precursor solution prevented formation of defects in the γ‐alumina top layer. After sintering at temperatures higher than 900°C, the common alumina top layer with addition of poly(vinyl alcohol) exhibits a bimodal pore distribution. The La‐doped alumina top layer (also with addition of poly(vinyl alcohol)) retains a monopore distribution after sintering at 1200°C.

Original languageEnglish (US)
Pages (from-to)219-224
Number of pages6
JournalJournal of the American Ceramic Society
Volume74
Issue number1
DOIs
StatePublished - Jan 1991
Externally publishedYes

Keywords

  • alumina
  • high temperature
  • membrane
  • sol–gel
  • thermal properties

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Preparation and Characterization of High‐Temperature Thermally Stable Alumina Composite Membrane'. Together they form a unique fingerprint.

  • Cite this