ISSN:
1662-0356
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Natural Sciences in General
,
Technology
Notes:
3D woven carbon fibre preforms (~ 2 mm thickness) were impregnated with single ormixture of non oxide ceramic nanoscale powders in ethanolic suspensions using electrophoreticdeposition (EPD). The measurement of the ζ potential of the suspension compared with itsbehaviour in sedimentation permits to conclude about the optimal concentration of surfactantnecessary to get the most stable suspension. The experimental results were in agreement with thetheoretical ones obtained using DLVO (Derjaguin, Landau, Verwey and Overbeek) theory. EPDswere carried out by applying a constant voltage between the 3D carbon fibre preform serving asdeposition electrode and counter electrodes in graphite. The effect of the powder concentrationon the rate and the quality of impregnation was studied. A qualitative model based on theexperimental results and literature was then proposed. Experiments were not only carried out onraw 3D fibrous preforms but also on preforms with interphases. SEM and optical micrographiesof fractured and polished sections of the infiltrated fabrics revealed that a quite high degree ofinfiltration (rates of impregnation estimated between 50 and 70 %) was obtained. At last, thecomposite was densified using spark plasma sintering (SPS)
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/42/transtech_doi~10.4028%252Fwww.scientific.net%252FAST.50.91.pdf
