Structure of powders produced by hydrolysis of metal alkoides
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Date
1989-08
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Publisher
Trans Tech Publications
Abstract
Ceramic powders consisting of monosized, spherical, 0.5μm diameter particles can be made by hydrolysing metal alkoxides in a very dilute environment. However, to avoid large amounts of effluent when producing powders on a large scale, it is necessary to work with high concentrations. The structure of powders was studied as a function of concentration, ranging from 20% alkoxide in ethanol to pure alkoxide. Alkoxide solutions were hydrolysed in thin layers by atmospheric moisture, i.e. at a slow but uncontrolled rate, and examined by scanning electron microscopy (SEM), nitrogen sorption analysis and mercury porosimetry. The densification behaviour in uniaxial hot pressing was also evaluated. The powder structure changes from discrete spheres of 0.5μm diameter at 20% concentration, to interconnected open agglomerates at 50% concentration and to relatively dense irregularly shaped pieces of material at 100% concentration.
Description
Physical copy of the journal held by ANSTO Library at DDC: 666/47.
Keywords
Ceramics, Powders, Particles, Metals, Alkoxides, Sorption, Nitrogen, Mercury, Porosity, Hot pressing, Concentration ratio, Agglomeration
Citation
Bendeich, P. J., & Buykx, W, J. (1989). Structure of powders produced by hydrolysis of metal alkoides. Presentation to the 2nd International Ceramic Conference (AUSTCERAM '90 : ceramics technology - sharing the knowledge, International Ceramic Conference), Perth, Western Australia, 26-31 August 1990. In Journal of the Australian Ceramic Society, 25, (2), 76.