Abstract
In fiber-reinforced ceramic-matrix composites (CMC), short-term, rapid oxidation at 1500°C is shown to promote the formation of silicon dioxide. This results in the buildup of a compact film with a high degree of crystallinity; the ensuing effects are closure of pores, self-healing of microcracks, and loss of mass reduced to a minimum. The carbon fibers retain structural integrity in all CMC. This technique can be employed to protect CMC-based components and thus to extend their service life.
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REFERENCES
I. Yu. Kelina, N. I. Ershova, L. A. Plyasunkova, and A. V. Arakcheev, “Properties of discrete and continuous SiC and C fibers in a hot-pressed silicon nitride matrix,” Ogneup. Tekh. Keram. No. 11, 37 – 44 (2000).
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Kelina, I.Y., Plyasunkova, L.A. & Chevykalova, L.A. Resistance of Si3N4/Cf Ceramic-Matrix Composites to High-Temperature Oxidation. Refractories and Industrial Ceramics 44, 249–253 (2003). https://doi.org/10.1023/A:1027339717118
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DOI: https://doi.org/10.1023/A:1027339717118