1438 J M. Ehrman et al Composites Science and Technology 67(2007)1425-1438 [33]Fujita H, Jefferson G, McMeeking RM, Zok FW. Mullite/alumina of improving it, Florence, Italy, September 25-29: 1961. Union mixtures for use as porous matrices in oxide fiber composites. J Am Scientifique Continentale du Verre, Charleroi, Belgium: 1962. p 511 Ceram Soc2004.87(2):261-7 [34] Fujita H, Levi CG, Zok Fw, Jefferson G. Controlling mechanical [40] Charles R, Hillig WB. Surfaces, stress-dependent surface reactions, properties of porous mullite/alumina mixtures via precursor-derive nd strength. In: Zackey VF, editor. High-strength m Is New lumina. J Am Ceram Soc 2005: 88(2): 367-75 York: wiley;1965.p.682-705 35]Wilson DM, Visser LR. High performance oxide fibers for metal and [41] wiederhorn SM. Influence of water vapor on crack propagation in eramic composites. Composites A 2001: 32: 1143-53 soda-lime glass. J Am Ceram Soc 1967: 50(8): 407-1 [36] Wilson DM, Lieder SL, Luenegurg DC. Microstructure and high- [42] Wiederhorn SM, Bolz LH S\es y corrosion and static fatigue of gla perature properties of Nextel 720 fibers. Ceram Eng Sci Proc J Am Ceram Soc 1970: 53(10): 54 1995:165):1005-14. [43] Wiederhorn SM. A chemical interpretation of static fatigue. JAm 7]Wannaparhun S, Seal S. A combined spectroscopic and thermody Ceram Soc 1972: 55(2): 81-5 namic investigation of Nextel- 720/ Alumina ceramic matrix composite [44] Wiederhorn SM, Freiman SW, Fuller ER, Simmons CJ. Effects of in air and water vapor at 1100C. J Am Ceram Soc 2003: 86(9) er and other dielectrics on crack growth. J Mater Sci 1628-30 [38] Campbell CX, Carelli EV, More KL, Varghese P, Seal S, Desai VH. [45]Michalske TA, Freiman Sw. A molecular mechanism for stress Effect of high-temperature water vapor exposure on Nextel 720 in a rosion in vitreous silica. J Am Ceram Soc 1983: 66(4): 284-8 Alumina-Matrix CMC. Siemens Westinghouse Power Corporation [46] Michalske TA, Bunker BC. Slow fracture model based on strained Technical Document TP-02076 silicate structures. J Appl Phys 1984: 56(10): 2686-93 [39]Charles R, Hillig WB. The kinetics of corrosion. In: Symposium on mechanical strength of glass and ways fracture. J Am Ceram Soc 1993: 76(10): 2613- tics model for glass glass failure by stress [47] Michalske TA, Bu[33] Fujita H, Jefferson G, McMeeking RM, Zok FW. Mullite/alumina mixtures for use as porous matrices in oxide fiber composites. J Am Ceram Soc 2004;87(2):261–7. [34] Fujita H, Levi CG, Zok FW, Jefferson G. Controlling mechanical properties of porous mullite/alumina mixtures via precursor-derived alumina. J Am Ceram Soc 2005;88(2):367–75. [35] Wilson DM, Visser LR. High performance oxide fibers for metal and ceramic composites. Composites A 2001;32:1143–53. [36] Wilson DM, Lieder SL, Luenegurg DC. Microstructure and high￾temperature properties of Nextel 720 fibers. Ceram Eng Sci Proc 1995;16(5):1005–14. [37] Wannaparhun S, Seal S. A combined spectroscopic and thermody￾namic investigation of Nextel-720/Alumina ceramic matrix composite in air and water vapor at 1100 C. J Am Ceram Soc 2003;86(9): 1628–30. [38] Campbell CX, Carelli EV, More KL, Varghese P, Seal S, Desai VH. Effect of high-temperature water vapor exposure on Nextel 720 in an Alumina-Matrix CMC. Siemens Westinghouse Power Corporation Technical Document TP-02076. [39] Charles RJ, Hillig WB. The kinetics of glass failure by stress corrosion. In: Symposium on mechanical strength of glass and ways of improving it, Florence, Italy, September 25–29; 1961. Union Scientifique Continentale du Verre, Charleroi, Belgium; 1962. p. 511– 27. [40] Charles RJ, Hillig WB. Surfaces, stress-dependent surface reactions, and strength. In: Zackey VF, editor. High-strength materials. New York: Wiley; 1965. p. 682–705. [41] Wiederhorn SM. Influence of water vapor on crack propagation in soda-lime glass. J Am Ceram Soc 1967;50(8):407–14. [42] Wiederhorn SM, Bolz LH. Stress corrosion and static fatigue of glass. J Am Ceram Soc 1970;53(10):543–8. [43] Wiederhorn SM. A chemical interpretation of static fatigue. J Am Ceram Soc 1972;55(2):81–5. [44] Wiederhorn SM, Freiman SW, Fuller ER, Simmons CJ. Effects of water and other dielectrics on crack growth. J Mater Sci 1982;17:3460–78. [45] Michalske TA, Freiman SW. A molecular mechanism for stress corrosion in vitreous silica. J Am Ceram Soc 1983;66(4):284–8. [46] Michalske TA, Bunker BC. Slow fracture model based on strained silicate structures. J Appl Phys 1984;56(10):2686–93. [47] Michalske TA, Bunker BC. A chemical kinetics model for glass fracture. J Am Ceram Soc 1993;76(10):2613–8. 1438 J.M. Mehrman et al. / Composites Science and Technology 67 (2007) 1425–1438