October 2003 Porous Oxide Matrix Composite Reinforced with Oxide Fibers 1739 ' National Materials Advisory Board, Committee on Advanced Fibers for High Temperature Ceramic Composites, Publication NMAB-494. National Academy Press, 110 T.J. McMahon, "Advanced Hot Gas Filter Development, "Ceram. Eng. Sei, Pre WOF 3601 J/m2 211347-57(2000 R, Warren(Ed). Comprehensive Composite Materials. Elsevier, Amsterdam, N610,1200°c100h Netherlands, 2000 WOF= 2542 J/m? Price.""Ceramic Stationary Gas Turbine Development Program-Fourth Annual 201200c/100h Summary, "AnN. Soc. Mech. Eng /Pap, 1. 97-GT-317(Is WOF= 1819J'm 'D. Filsinger, S. Munz, A. Schulz, S. Wittig, and G. Andrees, "Experimental Assessment of Fiber Reinforced Ceramics for Combustor Walls. Am. Soc. Mech N720.@C/2h Eng.Pap9GT·154(1997 K. Nishio, K.L. Igashira, K. Take, and T. Suemitsu, " Development of a 30 Eng,Pap198GT-104(1998 quist, L. Molliex, and O. Sudre, "Oxide/Oxide Ceramic 10 Matrix Composites in Gas Turbine Combustors, " Am. Soc. Mech. Eng, /Pap. 1, 98GT-301998) oW. H. Glime and J. D. Cawley."Stress Concentration Due to Fiber-Matni Fusion in Ceramic-Matrix Composites, " J, Am. Ceram. Soc., $1 [101 2597-604 Displacement(mm R. H. Jones, C. H. Henager Jr.C. A. Lewinsohn, and C. F, windisch. Jr, Fig. 9. Load versus displacement plots for notched composites reinforced ress.Corrosion Cracking of Silicon Carbide Fiber/Silicon Carbide Composite, with N720 or N610 fibers. in as-processed condition and after aging. JAm. Ceran.Soc,838l1999-2005(2000 R, E. Tressler. "Recent Developments in Fibers and D. B. Marshall, J. B. Davis, P. E. D. Morgan, and J Materials for Damage-Tolerant Oxide Composites, Key 127-131 d reached and, consequently, the area uI curve can be 27-36(1997) as a measure of the work of fractur WOF was measured to-1 6-2. 0 kJ/m for the N720 mEM1641631519 ing values for the N610 composite were.5-3.6 kJ/m". A slight Fiber Coatings for Oxide-Oxide CFCC, "Ceram Eng. Sci Prac. 18 131 279-86 decrease in WOF could be seen after heat treatment at 1200 C for 100 h. as shown in Table III M. K. Cinibulk, "Hexaluminate as a Cleavable Fiber- Matrix Interphase thesis, Texture Development, and Phase Compatibility. "J. Eur. Ceram. Soc., L1M Holmquist,RLundberg.OSudre,AGRazzell.L.Molliex,J,Benoit,and IV. Conclusions J. Adlerbom,"Alumina/Alumina Composite with a Porous Zirconia Interphase ssing. Properties and Component Testing. "J. Eur. Ceram. Soc. process to manufacture porous oxide mat oxide fiber composites was developed and evaluated. The method IO Sudre, A. G Razzell, L, Molliex, and M. Holmquist, "Alumina SingleCryst uses a preconsolidated slurry with a very high volume fraction of Fibre Reinforced Alumina Matrix for Combustor Tiles, Cera. Eng. Sci. Proc. powder to infiltrate fiber cloths. These infiltrated fiber cloths can M. J. O Brien and B. W. Sheldon,"Porous Alumina Coating with Tailored be frozen and used latter to fabricate engineering shapes. Mechan- Fracture Resistance for Alumina Composites. "J. Am. Ceram, Soc., 82| 3567- ical property measurements suggest that the processing method (1999) used here was comparable to porous oxide matrix composites K. A. Keller, T-1. Mah, T. A. Parthasarathy, and C. M. Cooke, "Fugitive Interfacial Carbon Coatings for Oxide/Oxide Composites. "J. Am Cerum. Soc., 8[2] manufactured by other processes using the same fibers 329-36(2000) In-plane flexural tests of composites based on alumina N610 W.-C. Tu, F, F. Lange. and A. G. Evans, " Concept for a Damage Tolerant and mullite/alumina N720 fibers showed nonbrittle fracture behav Ceramic Composite with "Strong"Interfaces, J. Am. Ceran. Soc. 79121417-24 ior and strengths of >280 and >170 MPa, respectively, and moderate notch sensitivity. Interlaminar shear strength, which is F. F. Lange, C, G. Levi, and F, w. Zok, " Processing Fiber Reinforced Ceramics with Porous Matrices": Ch. 14 in Comprehensive Composite Materials. Edited by R, dominated by the porous matrix, ranged between 7 and 12 MPa for Warren. Elsevier, Amsterdam, Netherlands. 2000 matrix porosity ranging from 38% to 43%o, respectively J. Haslam, K E Berroth, and F F. Lange, "Processing and Properties of an The composites possessed good thermal stability: the micro- All-Oxide Composite with a Porous Matrix, J. Eur. Ceram. Soc., 20, 607-18 structure was stable after aging at 1200 C for 100 h, showing no 2C, G, Levi, F. W, Zok, J -Y. Yang, M. Mattoni, and J. P. A. Lofvander visible signs of densification. This heat treatment was found to le Porous Matrices for All-Oxide Ceramic Compo slightly increase the interlaminar shear strength, which was ites." Z Metalled,9012]1037-47(1999 attributed to a strengthening of the matrix network, and was F. F. Lange, W. C. Tu, and A. G. Evans, U.S. Pat. No, 5856 252, 1999. Several ccompanied by a reduction in composite toughness. However DL. P. Zawada. "Longitudinal and Transthickness Tensile Behavi the 1200C/(100 h)treatment did not significantly change the Oxide/Oxide Composites, "Ceram Eng. Sci. Proc., 19 B31327-39(1998). 27R.A Jurf and S C. Butner,"Advances in Oxide- Oxide CMC, "An. Soc. Mech mposite strength or strain to failure. Heat treatment at 1300 C for 100 h reduced the strength for the N610 and N720 G. Levi, J, -Y. Yang, B J Dalgleish, F. w, Zok, and A, G. Evans, "Processin composites by 35% and 20%, respectively, and increased their and Performance of an All-Oxide Ceramic Composite. " J. Am. Ceram Soc., 81 [81 brittle nature Derived Alumina on the Mechanical Properties of a PorousMatrix. All-Oxide Ceramic Composite. "J Am, Ceram. Soc., in revie Acknowledgments A. Heathcote, X.Y. Gong, I -Y, Yang, U. Ramamurty, and F. w. Zok, " In-plane Mechanical Properties of an All-Oxide Ceramic Composite. " J Am Ceran We thank R. Harrysson for SEM work and Professor F. W. Zok, Dr. J -Y, Yang. Soc,82012721-30 A. V. Carelli, H, Fujita, J. Y. Yang, and F. w. Zok, "Effects of Thermal Aging aG. W. ranks and F. E. Lange. "Plastic Clay-like Flow Stress of Saturated References SM. Holmquist. T C. Radsick, O. Sudre, FF. Lange, and F W. Zok. " Fabrication and Testing of All-Oxide CFCC Tubes, to be submitted C, P Beesley, " The Application of CMCs in High Integrity Gas Turbine F. F. Lange, T. C. Radsick, and M. Holm nes." Key eng.Maer,127-131.165-74(1997) Control of Microstructure and Properties": pp. 587-99 Beyer, H. Knabe. and F. Strobel. "Development and Testing of C/SiC ternational Conference on High Temperature Ceramic Matrix Components for Liquid Rocket Propulsion Applications. " AlAA Pap,,99-2896 Edited by w. Krenkel, R. Naslain, and H. Schneider. Wiley-VCH, New York, (1999