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Fine-grained spinel-silica composites can be prepared by the addition of approximately equal amounts of a colloidal silica dispersion to a size classified spinel dispersion.
English (United States)
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Preparation of Fine-Grained Spinel-Silica Composites
Fine-grained spinel-silica composites can be prepared by the addition of
approximately equal amounts of a colloidal silica dispersion to a size classified
In one part of the process narrowly sized spinel powder is obtained by
suspending commercially available spinel powder in an aqueous solution which
has been acidified to approximately pH 3.5 using acetic or nitric acid and
subsequently size-classifying the resulting dispersion by semi-continuous
Commercially available colloidal silica particles, also used in the composite
powder, are preprocessed by dilution with water to a concentration of about 1.5
M, with addition of an ionic exchange resin to remove alkali ions, and adjustment
to pH 3.5 using acetic acid.
A composite powder dispersion is then prepared by the slow addition of equal
amounts of silica dispersion to vigorously stirred size-classified spinel dispersion.
The pH's of both dispersions are matched at 3.5, and silica and spinel
concentrations are previously adjusted to about 1.2 M and 0.28 M, respectively.
At a pH of 3.5, silica and spinel have opposite surface charges and hence are
normally attracted to each other in dispersion. Slow addition of silica to spinel,
diluteness of the spinel dispersion, and more highly concentrated silica
dispersion all promote the formation of non-flocculated silica-spinel composite
powder which is comprised of individual spinel par...