Manufacturing of ceramic-ceramic composites by colloidal routes

Rodrigo Moreno 

Institute of Ceramics and Glass (ICV-CSIC), Kelsen 5, Madrid 28049, Spain

Abstract

Ceramic-based composites have received great attention due to their wide number of applications. It is desirable to produce materials with the suitable combination of properties of various components. The addition of a low concentration of secondary phase to a ceramic matrix has a great effect on the behavioural properties of the composite. Nevertheless, the final properties of the composites are a function of the characteristics of the starting powders used in their manufacture. This work deals with the manufacture of ceramic-ceramic composites by using suspensions of oxides with different characteristics, such as particles size distribution and surface area. In addition to the synthesis routes employed for each powder, the dispersion of the mixtures is the key point to produce homogeneous materials. This can be achieved by manipulating the interaction potentials between the components through heterocoagulation and dispersion mechanisms. The stability of the suspensions can be studied in terms of zeta potential measurements and interparticle potential calculations. The manufacture of bulk bodies needs the preparation of concentrated suspensions in order to reduce the amount of liquid to be removed during green processing. This work focuses on the manufacture of alumina-based composites including compatible oxides or incompatible ones that develop through a reaction sintering process.

 

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Presentation: Invited oral at E-MRS Fall Meeting 2009, Symposium I, by Rodrigo Moreno
See On-line Journal of E-MRS Fall Meeting 2009

Submitted: 2009-05-26 13:31
Revised:   2009-06-07 00:48
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