Filling of surface cracks in MAX phase ceramics using cathodic electrophoretic deposition
This source preferred by Amor Abdelkader
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Authors: Abdelkader, A.M., Garcia, S.J. and Zwaag, S.V.D.
Journal: Ceramics International
It is well known that surface defects, such as cracks, are electrochemical more active than a smooth surface and usually work like seeds for the deposition processes. The present work used this enhanced activity to locally deposit surface-charged Al 2 O 3 and TiC micro and nano-particles into surface cracks in Ti 2 AlC substrates. The formed deposit was compact and adhered well to the crack walls. A crack of about 30 μm could be filled with alumina particles in 10 min when applying 15 V and using a 5 wt% alumina suspension in ethanol. The deposition of TiC was more challenging due to coarseness of the particles. Grinding these particles to 1-2 μm yielded a very stable suspension and an improvement in the crack filling behaviour. © 2012 Elsevier Ltd and Techna Group S.r.l.