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x. Yin et al. Composites Science and Technology 61(2001)977-980 4. Conclusions Scientific Foundation of the Peoples Republic of China Studies on the oxidation behaviors of 3D C/SiC composit ed in combustion gas and dry air References respectively have shown the following results [ Berton B, Bacos MP, Demange D, Lahaye J. High temperature behavior of the hot structure materials of Hermes Space Shuttle. 1. Weight loss of the 3D C/SiC composite is related In: Naslain R, Lamalle J, Zulian JL, editors. Composite materials to the pores and microcracks in the CVI Sic matrix and d the pores are proved to play a key role in understanding the effect of environment on the 2 Cavalier JC, Lacombe A, Rouges JM. Ceramic matrix compo oxidation behavior of the composites Massiah A editors. Developments in the science and technology 2. Mechanical properties of the C/SiC samples oxi- of composite materials. London: Eisevier, 1989.p 99-110 dized in combustion gas decrease less apparently 3 Lamouroux F, Camus G. Kinetics and mechanisms of oxidation han in dry air, which mainly result from the low of 2D woven C/SiC composites: I, experimental approach. J Am partial pressure of oxygen in combustion atmo- CeramSoc I994;77(8):204957 (4 Lamouroux F, Bourrat x, Sevely J, Naslain R. Structure/ oxida- sphere tion behavior relations in the carboneous constituents of 2Dc (T300)/P, C/SiC(CVI) composites. Carbon 1993: 31(8): 1273-88 Nathan S Jacobson. corrosion of silicon-based ceramics in com- Acknowledgements bustion environments. J Am Ceram Soc 1993: 76(1): 3-28. [6 Huger M, Fargeot D, Gault C. Ultrasonic characterization of This work was supported by National Natural Scien xidation mechanisms in nicalon/C/SiC composites. J Am Ceram Soc1994:77(10):255460. ific Foundation of the People's Republic of China [7 Pila EJ. Oxidation kinetics of chemically vapor-deposited sili- under the Contract No. 59772030 and Nation Defense con carbide in wet oxygen. J Am Ceram Soc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