Approaching a Methodology for Designing Composite Applications
Integrated Composite Particles for Designing of ...
Transcript of Integrated Composite Particles for Designing of ...
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Integrated Composite Particles for Designing
of Microstructural Controlled Nanocomposite
Atsushi Yokoi
Hiroyuki Muto
Abstract
ãThe fabrication of composite with nano-size particles dispersed in ceramic matrix
often improves not only the mechanical properties such as failure strength, fracture
toughness, fatigue and ware resistances, etc. of structural ceramics but also the
electrical, magnetic, and optical properties of functional ceramics. In composite
processing, in general, to properly design a desired microstructure/property, it will be
very essential that the second phase nano particles must be well dispersed in the
matrix. In the conventional fabrication technique of nanocomposites, mechanical
mixing of raw powders in a ball mill has often been conducted. However, this
technique might be insuf ficient to produce nanocomposites with homogeneous
microstructures due to the aggregation of nano-sized raw powder. The processing
through an aqueous solution such as coprecipitation method has also been extensively
studied to fabricate nanocomposite particles. However, these techniques are still in its
developing stages and containing some of practical disadvantages and difficulties.
ãThe layer by layer ïŒLbLïŒ adsorption method has been recognized as one of
powerful techniques to fabricate an ultrathin nano film coated onto a solid substrate.
The most of studies on LbL techunique have been conducted to produce multilayered
nano films of polyelectrolytes, and then utilize them to adsorb various kinds of
chemical species, such as protein, nucleic acid, nanoparticles, etc. Recently, an LbL
technique was successfully applied not only to flat surfaces such as flat substrates, but
also to spherical grains, to fabricate alternatively multilayered composites on colloidal
particles. LbL-method will be one of the simplest and the most versatile processing
techniques for fabricating nanocomposite powders with homogeneous microstructure.
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ãIn this study, we propose a novel processing technique to fabricate nanocomposite
powders. The composite powders obtained in this study, i.e., the integrated composite
powders by coating nano-sized additive particles on the surface of matrix particles. It
was concluded that the electrostatic adsorption assembly technique based on LbL-
method is an ef ficient tool for designing of microstructural controlled nano-
composites.
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