Impregnation of 3D Woven Carbon Fibre Preforms by Electrophoretic Deposition of Single and Mix of Non Oxide Ceramic Nanoscale Powders, and Densification of the Composite Material |
| Journal |
Advances in Science and Technology (Volume 50) |
| Volume |
Advanced Inorganic Fibrous Composites V |
| Edited by |
P. VINCENZINI and M. SINGH |
| Pages |
91-96 |
| DOI |
10.4028/www.scientific.net/AST.50.91 |
| Online since |
October, 2006 |
| Authors |
N. Eberling-Fux,
R. Pailler,
A. Guette,
Sebastien Bertrand,
Eric Philippe
|
| Keywords |
Carbon Preform, Ceramic Matrix Composite (CMC), Electrophoretic Deposition (EPD), Spark Plasma Sintering (SPS) |
| Abstract |
3D woven carbon fibre preforms (~ 2 mm thickness) were impregnated with single or
mixture of non oxide ceramic nanoscale powders in ethanolic suspensions using electrophoretic
deposition (EPD). The measurement of the ΞΆ potential of the suspension compared with its
behaviour in sedimentation permits to conclude about the optimal concentration of surfactant
necessary to get the most stable suspension. The experimental results were in agreement with the
theoretical ones obtained using DLVO (Derjaguin, Landau, Verwey and Overbeek) theory. EPDs
were carried out by applying a constant voltage between the 3D carbon fibre preform serving as
deposition electrode and counter electrodes in graphite. The effect of the powder concentration
on the rate and the quality of impregnation was studied. A qualitative model based on the
experimental results and literature was then proposed. Experiments were not only carried out on
raw 3D fibrous preforms but also on preforms with interphases. SEM and optical micrographies
of fractured and polished sections of the infiltrated fabrics revealed that a quite high degree of
infiltration (rates of impregnation estimated between 50 and 70 %) was obtained. At last, the
composite was densified using spark plasma sintering (SPS). |
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