Journal
CARBON
Volume 40, Issue 4, Pages 583-587Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0008-6223(01)00151-8
Keywords
carbon/carbon composites; coating; oxidation
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An oxidation protective double layered coating was deposited on a carbon-carbon composite (C/C) using a simple and low cost method. A surface modification of the C/C was obtained by direct reaction of liquid silicon with the C/C, promoting the formation of a 5-10 mum beta-SiC layer on the composite surface. The inner layer, in contact with the C/C, is a composite made with a barium borosilieate glass matrix (SABB) and boron carbide particles; the outer layer is another composite layer formed by a SABB glass matrix and yttrium oxide particles. The layers are deposited by a slurry technique. Oxidation tests were carried out in a furnace in air, in order to verify the coating stability and its effectiveness. No mass loss of the C/C composite was observed after 100 h at 1200 degreesC, while after 150 h at 1300 degreesC the C/C mass loss did not exceed 1%. (C) 2002 Elsevier Science Ltd. All rights reserved.
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