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Preparation of Spherical Yttria‐Stabilized Zirconia Powders by Reactive‐Spray Atomization
Author(s) -
Belov Vladimir,
Belov Irena,
Harel Lilian
Publication year - 1997
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.1151-2916.1997.tb02930.x
Subject(s) - cubic zirconia , calcination , materials science , yttria stabilized zirconia , chemical engineering , microstructure , sol gel , particle size , ceramic , ammonia , particle (ecology) , mineralogy , composite material , nanotechnology , chemistry , catalysis , organic chemistry , oceanography , geology , engineering
A new inorganic sol–gel process of zirconia (yttri‐stabilized) spherical powders production has been developed. The process is based on spraying zirconia sol into an ammoniawater solution, followed by drying of the gel precipitate and calcination. The gel particles preserve the spherical shape of sprayed droplets, because of a thin solid film that forms on the drop surface via its contact with gaseous ammonia before the impact with the ammonia solution. Being dried and calcined, the gel spheres transform to free–flowing powders composed of the solid, not hollow smooth spheres of zirconia–yttria solid solutions. The particle composition, morphology, and microstructure have been investigated in detail versus the process conditions.