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Preparation Method of Submicrometer‐Sized α‐Alumina by Surface Modification of γ‐Alumina with Alumina Sol
Author(s) -
Han Kyoung R.,
Lim Chang Sup,
Hong MeeJeong,
Jang Jin Wook,
Hong Kug Sun
Publication year - 2000
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2000.tb01269.x
Subject(s) - alumina ceramic , materials science , activated alumina , aluminium oxides , particle size , chemical engineering , sol gel , surface modification , dispersant , composite material , ceramic , dispersion (optics) , catalysis , nanotechnology , chemistry , physics , optics , engineering , biochemistry
A method is introduced to prepare almost‐spherical submicrometer‐sized α‐alumina via surface modification of γ‐alumina with an alumina sol. Milled γ‐alumina, in the presence of 3 wt% of α‐alumina with a median particle size ( d 50 ) of 0.32 μm (AKP‐30), produced irregularly shaped α‐alumina with d 50 ∼0.3 μm after heat treatment at 1100°C for 1 h. γ‐alumina that had been surface‐modified by milling in the presence of 3 wt% of the alumina sol resulted in almost‐monosized, spherical α‐alumina ∼0.3 μm in size after heat treatment at 1100°C for 1 h. Furthermore, almost‐spherical α‐alumina 0.1—0.2 μm in size was obtained by milling γ‐alumina with 3 wt% of AKP‐30 alumina in the presence of 3 wt% of the alumina sol, followed by heat treatment at 1100°C for 1 h. The alumina sol that has been introduced in this work seems to act as a dispersant, in addition to helping to form a spherical shape.