Progresses in the characterisation of structural oxide/oxide ceramic matrix composites fabricated by electrophoretic deposition

Heinrich Kern 2Erick Stoll 2P. Mahr 2H-G. Krüger 2A. R. Boccaccini 1

1. Imperial College London, Department of Materials, London, United Kingdom
2. Institute of Materials Technology, Technical University of Ilmenau, Gebäude "Werkstoffe 1", Ilmenau 98693, Germany

Abstract

Oxide/oxide-ceramic matrix composites (CMCs) are a new trend of materials that offer the advantages of ceramics like resistance to heat, erosion and corrosion, while adding toughness and thermal shock resistance. These materials are used where designers seek less downtime, reduced maintenance, lower operating cost, increased operating temperature, increased efficiency, lower emissions and reduced life-cycle costs. In the present work a method based on electrophoretic deposition techniques has been developed to fabricate continuous oxide fibre reinforced ceramic matrix composite. A new EPD cell was designed and built to warrant the improved infiltration of the oxide ceramic particles in several fibre mats used as reinforcement. For electrophoretic deposition of the ceramic component, a non-aqueous suspension consisting of alumina nanoparticles (-Al2O3), ethanol and addition of 4-hydroxybenzoic acid was optimised by electro kinetic sonic amplitude (ESA) measurement. This kind of suspension is produced as a model to describe and characterize the mechanism of the electrical deposition to infiltrate oxide fibre mats (NextelTM 720). The composites exhibit a homogeneous matrix microstructure, characterised by a very high particle packing density, a convenient fibre content and relatively low porosity after sintering at 1300 C without holding time. The developed EPD cell allows for production of relatively large bodies with a diameter of 110 mm and “pseudo-ductile” fracture behaviour of the composite during the action of a reasonable strength value has been achieved. The electrophoretic deposition (EPD) method is presented as convenient alternatively technique to fabricate oxide/oxide CMC’s with improved high matrix density, high fibre content and suitable mechanical properties

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Presentation: oral at E-MRS Fall Meeting 2005, Symposium H, by Erick Stoll
See On-line Journal of E-MRS Fall Meeting 2005

Submitted: 2005-05-27 09:22
Revised:   2009-06-07 00:44
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