Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 27, Issue 2-3, Pages 1299-1302Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2006.04.026
Keywords
mullite; composites; sol-gel synthesis; electrophoretic deposition
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Sufficiently thick and homogeneous layers which transform into mullite at T >= 1000 degrees C were synthesized by means of sot-gel technology and electrophoretically deposited onto the surface of C/C-Si-SiC composites. The protectiveness of the deposited mullite layers was isothermally tested in air in the temperature range 1200 <= T <= 1550 degrees C for up to 200 h. At temperatures above 1600 degrees C, the protectiveness of the deposited layer is reduced due to the existence of a liquid phase and the formation of CO bubbles above the cracks in the SiC layer. In order to prolong the protectiveness of our mullite layers at higher temperatures an additional layer from a suspension of mullite precursor with 5 wt.% of Al2O3 powder was deposited. The protectiveness of the obtained mullite and mullite/Al2O3 multilayer systems were also tested under cyclic conditions. These experiments yielded encouraging results, which will have to be confirmed at higher temperatures. (c) 2006 Elsevier Ltd. All rights reserved.
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