Preparation and Properties of Porous a-Al sub(2)O sub(3) Membrane Supports
Strong and permeable macro-porous a-Al sub(2)O sub(3) membrane supports are made by colloidal filtration of 20 vol% dispersions of a-Al sub(2)O sub(3) with an average particle size of 600 nm. Intact compacts with very good surface quality were obtained at an optimum pH of 9.5 and dosage of 0.2 wt% a...
Gespeichert in:
Veröffentlicht in: | Journal of the American Ceramic Society 2006-06, Vol.89 (6), p.1790-1794 |
---|---|
Hauptverfasser: | , , , |
Format: | Artikel |
Sprache: | eng |
Schlagworte: | |
Online-Zugang: | Volltext |
Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
Zusammenfassung: | Strong and permeable macro-porous a-Al sub(2)O sub(3) membrane supports are made by colloidal filtration of 20 vol% dispersions of a-Al sub(2)O sub(3) with an average particle size of 600 nm. Intact compacts with very good surface quality were obtained at an optimum pH of 9.5 and dosage of 0.2 wt% ammonium aurintricarboxylate (Aluminon), based on dry alumina. The colloidal stability of the aluminon-stabilized slurries is confirmed by y potential measurements. Slight sintering of dense-packed a-Al sub(2)O sub(3) compacts was found to result in >67% packing density and a bimodal pore-size distribution as derived from shrinkage behavior and gas adsorption studies. Non-stationary single gas permeation measurements showed improved gas permeability, compared with a-Al sub(2)O sub(3) compacts prepared using powder with a smaller particle size (300 nm). The strength of the disk-shaped alumina compacts within the porosity range of 30%-20% increased from 100 to 300 MPa with a standard deviation of 20 and 50 MPa, respectively. |
---|---|
ISSN: | 0002-7820 1551-2916 |
DOI: | 10.1111/j.1551-2916.2006.01037.x |