In:
Key Engineering Materials, Trans Tech Publications, Ltd., Vol. 512-515 ( 2012-6), p. 757-760
Abstract:
In order to improve the oxidation resistance property of carbon/carbon composites, the C/C matrix was modified with a borate sol precursor and B 4 C micro-powders by a sol-gel integrating with a solvothermal process. The phase compositions, surface and cross-section microstructures of the C/C matrix modified by different B 4 C content were particularly investigated. Results show that the surface of the modified composites is covered by a coating composed of B 2 O 3 and B 4 C, meanwhile, the internal micro-holes of the C/C composites are occupied by B 2 O 3 and B 4 C. After oxidation in air at 973 K, the B 2 O 3 glassy phase, due to the oxidation of B 4 C, seals the cracks and holes and effectively prevents C/C composites from oxidation. The weight loss of the modified C/C composites is only 2.21 % after oxidation in air at 973 K for 20 h.
Type of Medium:
Online Resource
ISSN:
1662-9795
DOI:
10.4028/www.scientific.net/KEM.512-515
DOI:
10.4028/www.scientific.net/KEM.512-515.757
Language:
Unknown
Publisher:
Trans Tech Publications, Ltd.
Publication Date:
2012
detail.hit.zdb_id:
2073306-9
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