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Interlaminar tensile and shear strengths of six different fiber-reinforced ceramic matrix composites were determined at ambient temperature with transthickness tension and double-notch shear test methods, respectively. Overall, interlaminar shear strength was about three times greater than interlaminar tensile strength for the composites considered. Some size effect on interlaminar shear strength was observed for SiC/SiC composites. Rate dependency of shear strength of a Hi-Nic SiC/SiC composite was also determined at 1316 °C in air using constant shear stress-rate testing. Degradation of interlaminar shear strength with decreasing shear stress rate, termed rate dependency or delayed failure, was observed. A previously proposed phenomenological model was used to account for and to quantify the rate dependency of interlaminar shear strength of the composite. Additional stress rupture testing in shear for the same SiC/SiC composite was conducted at 1316 °C in air to validate the proposed model. Notwithstanding the limited number of test specimens used, the model was in reasonable agreement with the stress rupture data.

Preface ix FIBER COMPOSITES. Influence of Fiber Orientation on the Mechanical Properties and Microstructure of C/C-SiC Composite Plates Produced by Wet Filament Winding Technique 3 Fabian Breede, Severin Hof mann, Enrico Klatt, and Sandrine Denis High-Temperature Interlaminar Tension Test Method Development for Ceramic Matrix Composites 11 Todd Z. Engel, Wayne S. Steffier, and Tony Magaldi Life Limiting Behavior of Ceramic Matrix Composites Under Interlaminar Shear at Elevated Temperatures 23 Sung R. Choi NANO-CERAMICS AND COMPOSITES. Effect of Coating Parameters on the Electrodeposition of Nickel Containing Nano-Sized Alumina Particles 41 R. K. Saha, S. Mohamed, and T. I. Khan Synthesis of AI203-TiC Nano-Composite Particles by a Novel Electro-Plasma Process 51 Kaiyang Wang, Peigen Zhang, Jiandong Liang, and S.M. Guo TESTING, CHARACTERIZATION, AND MICROSTRUCTUREPROPERTY RELATIONSHIPS. Research on Tribological Properties of Reactive Sintered Si3N4-Based Composite Ceramic 63 Hai-long Ma, Chong Cui, Xing Li, Yuan-ting Wang, and Hai-jun Zhou Preparation of Nano and Micron Sized ZrO2 Dispersed Al2O3 Ceramic Composites and Study Their Hardness and Fracture Toughnesses 75 Kuntal Maiti and Anjan Sil Influence of Particle Size Distribution of Wollastonite on the Mechanical Properties of CBPCs (Chemically Bonded Phosphate Ceramics) 85 H. A. Colorado, C. Hiel, and H. T. Hahn Foreign Object Damage in an N720/Alumina Oxide/Oxide Ceramic Matrix Composite under Tensile Loading 99 D. Calvin Faucett and Sung R. Choi FUNCTIONALLY GRADED MATERIALS. Thermally Sprayed Functionally Graded Materials 109 Pavel Chraska and Tomae Chraska CERAMIC PROCESSING. Development of Ultra-High Temperature Stable Ceramics by Reactive Infiltration Processes* 123 R. Voigt, W. Krenkel, G. Motz, and A. Can Shape Evolution of Spanning Structures Fabricated by Direct-Write Assembly of Concentrated Colloidal Gels 131 Cheng Zhu and James E. Smay COMPOSITES PROCESSING. Colloidal Processing of Ceramic-Ceramic and Ceramic-Metal Composites 147 Rodrigo Moreno Processing of Nitride Porous Ceramic Composites via Hybrid Precursor System Chemical Vapor Deposition (HYSYCVD)/Direct Nitridation (DN) 161 M. I. Pech-Canul and J. C. Flores-Garcia Effect of Nano-SiO2 on Microstructure, Interface and Mechanical Properties of Whisker-Reinforced Cement Composites 173 Mingli Cao and Jianqiang Wei DIRECTIONAL SOLIDIFICATION AND MICROWAVE PROCESSING Engineered Self-Organized Microstructures Using Directional Solidification of Eutectics 185 V. M. Orera, J. I Pena, A. Larrea, R. I. Merino, and P. B. Oliete Effect of Different Fuels on the Microwave-Assisted Combustion Synthesis of Ni0.5Zn0.5Fe1.95Sm0.05O4 Ferrites 197 A. C. F. M. Costa, D. A. Vieira, V. C. Diniz, H. L. Lira, D. R. Cornejo, and R. H. G. A. Kiminami Author Index 207 *Paper Presented at the 8th Pacific Rim Conference on Ceramic and Glass Technology, May 31-June 5, 2009

The slow crack growth parameters of a hot-pressed silicon nitride were determined at 1200 and 1300 C in air by statically, dynamically and cyclicly loading bend specimens. The fatigue parameters were estimated using the recently developed CARES/Life computer code. Good agreement exists between the flexural results. However, fatigue susceptibility under static uniaxial tensile loading, reported elsewhere, was greater than in flexure. Cyclic flexural loading resulted in the lowest apparent flexural fatigue susceptibility.

The R-curve and fatigue behavior of a silicon nitride with large, highly elongated grains were compared to those of a silicon nitride with smaller, more equiaxed grains. The former was found to have higher toughness and a slightly rising R-curve which enhanced fatigue resistance, while the latter had constant toughness with crack length. The R-curve was attributed to crack deflection and grain pull-out. The microstructure did not influence the dynamic fatigue properties of the two ceramics, as both had good resistance to dynamic fatigue. The cyclic fatigue resistance of the large-grained Si3N4, however, was surprisingly low.

The dynamic fatigue behavior of 30 vol pct SiC whisker-reinforced silicon nitride was determined in flexure as a function of temperature from 1100 to 1300 C in an air environment. The fatigue susceptibility parameter n decreased from 88.1 to 20.1 with increasing temperature from 1100 to 1300 C. A transition in the dynamic fatigue curve occurred at a lowest stressing rate of 2 MPa/min at a temperature of 1300 C, resulting in a considerably lower value of n = 5.8. This transition was primarily due to creep that was enhanced by a combination of high temperature and very slow deformation rate. The fatigue resistance of natural flaws at 1100 C was found to be greater than that of artificial flaws produced by indentation.