S. Wu et al. Materials Letters 60(2006)3197-3201 composite oxidized at different temperature indicated the 3]P Fenici, A.J. Frias Rebelo, R H. Jones, A Kohyama, LL. Snead, J NucL. same regularity. The residual flexural strength of the Mate:.258-263(1998)215 composite was governed by the consumption of Pyc [5]S. Jacques, A. Lopez-Marure, C. Vincent, H. Vincent, J. Bouix, I.Eur. interphase, and the oxidation had few effects on the strength of the composite. Above 1200oC, the residual flexural [6]RJ. Kerans, R.S. Hay, T.A. Parthasarathy, Curr Opin. Solid State Mater. strength of the composites was governed by the strength Sc.4(1999)445 degradation of the Hi-Nicalon fib [7RE Tressler, Composites, Part A 30(1999)429. 3. Because oxidation took place along and weakened the [8]M. Takeda, A. Urano, J. Sakamoto, Y Imai, J Nucl. Mater. 258-263 (1998)159 interphase between the fibers and matrix, the fracture [9 C. Labrugere, L Guillaumat, A Guette, R. Naslain, J. Eur. Ceram Soc. 1 displacement increased with the increasing weight loss after (1991)641 oxidation and the fracture mode showed a non-brittle pattern. [10] H Ichikawa, Ann. Chim. Sci. Mater. 25(2000)523 [11M. Takeda, J. Sakamoto, Y Imai, H. Ichikawa, Compos. Sci. TechnoL. Acknowledgements (1999)813 [12]J F. Jamet, P. Lamicq, in: R. Naslain, J. Lamon, D. Doumeingts(eds ) High Temperature Ceramic Matrix Composites I, HT-CMC L, Woodhead The authors acknowledge the of the Publishing Limited, Cambridge, England, 1993, p. 735 National Foundation for Natura under [13] W. Yang. A Kohyama, T. Noda, et al., J. Nucl. Mater. 307-311(2002) No. 90405015 and the NSFC Disti Young under Contract No. 50425208. 2004 [14] C.E. Ramberg, G. Cruciani, K E. Spear, R E. Tressler, C F. Ramberg Jr, J. Am. Ceram. Soc. 79(1996)2089. 15 M. D. Thouless, O. Sbaizero, L.S. Sigl, A G. Evans, J. Am. Ceram Soc. 72 References [16] T. Mah, M.G. Mendiratta, A P. Katz, R. Ruh, K.S. Mazdiyasni, J.Am. 1]B N. Cox, F.W. Zok, Curr Opin. Solid State Mater. Sci. 1(1996)666. Ceram Soc. 68(1985)C27. [2]R. Naslain, Compos. Sci. TechnoL. 64(2004)155composite oxidized at different temperature indicated the same regularity. The residual flexural strength of the composite was governed by the consumption of PyC interphase, and the oxidation had few effects on the strength of the composite. Above 1200 °C, the residual flexural strength of the composites was governed by the strength degradation of the Hi–Nicalon fiber. 3. Because oxidation took place along and weakened the interphase between the fibers and matrix, the fracture displacement increased with the increasing weight loss after oxidation and the fracture mode showed a non–brittle pattern. Acknowledgements The authors acknowledge the support of the Chinese National Foundation for Natural Sciences under Contract No.90405015 and the NSFC Distinguished Young Scholar under Contract No.50425208, 2004. References [1] B.N. Cox, F.W. Zok, Curr. Opin. Solid State Mater. Sci. 1 (1996) 666. [2] R. Naslain, Compos. Sci. Technol. 64 (2004) 155. [3] P. Fenici, A.J. Frias Rebelo, R.H. Jones, A. Kohyama, L.L. Snead, J. Nucl. Mater. 258–263 (1998) 215. [4] R. Naslain, Composites, Part A 29A (1998) 1145–1155. [5] S. Jacques, A. Lopez–Marure, C. Vincent, H. Vincent, J. Bouix, J. Eur. Ceram. Soc. 20 (2000) 1929. [6] R.J. Kerans, R.S. Hay, T.A. Parthasarathy, Curr. Opin. Solid State Mater. Sci. 4 (1999) 445. [7] R.E. Tressler, Composites, Part A 30 (1999) 429. [8] M. Takeda, A. Urano, J. Sakamoto, Y. Imai, J. Nucl. Mater. 258–263 (1998) 1594. [9] C. Labrugère, L. Guillaumat, A. Guette, R. Naslain, J. Eur. Ceram. Soc. 17 (1991) 641. [10] H. Ichikawa, Ann. Chim. Sci. Mater. 25 (2000) 523. [11] M. Takeda, J. Sakamoto, Y. Imai, H. Ichikawa, Compos. Sci. Technol. 59 (1999) 813. [12] J.F. Jamet, P. Lamicq, in: R. Naslain, J. Lamon, D. Doumeingts (eds.), High Temperature Ceramic Matrix Composites I, HT–CMC I, Woodhead Publishing Limited, Cambridge, England, 1993, p. 735. [13] W. Yang, A. Kohyama, T. Noda, et al., J. Nucl. Mater. 307–311 (2002) 1088. [14] C.E. Ramberg, G. Cruciani, K.E. Spear, R.E. Tressler, C.F. Ramberg Jr., J. Am. Ceram. Soc. 79 (1996) 2089. [15] M.D. Thouless, O. Sbaizero, L.S. Sigl, A.G. Evans, J. Am. Ceram. Soc. 72 (1989) 525. [16] T. Mah, M.G. Mendiratta, A.P. Katz, R. Ruh, K.S. Mazdiyasni, J. Am. Ceram. Soc. 68 (1985) C27. S. Wu et al. / Materials Letters 60 (2006) 3197–3201 3201