Microstructure and Mechanical Properties of Silicon Nitride Materials Fabricated from SHS Powders

Two different silicon nitride powders, one produced by self-propagating high-temperature synthesis (SHS) and one commercial, have been equally processed to obtain dense materials. Y 2 O 3 powders as a sintering aid and hot-pressing techniques were used to process the materials. The fracture toughness and strength of the materials prepared have been evaluated and the results comparatively discussed as a function of the microstructure, with special emphasis on the characteristics of the initial powders.

[1]  Dong-Soo Park,et al.  Orientation-dependent properties of silicon nitride with aligned reinforcing grains , 2000 .

[2]  M. I. Osendi,et al.  Study of AlN and Si3N4 powders synthesized by SHS reactions , 1999 .

[3]  H. Kleebe,et al.  Microstructure and Fracture Toughness of Si3N4 Ceramics: Combined Roles of Grain Morphology and Secondary Phase Chemistry , 1999 .

[4]  Zhangjian Zhou,et al.  Combustion synthesis of α–Si_3N_4 whiskers , 1999 .

[5]  M. Reece,et al.  Cyclic fatigue behaviour of silicon nitride materials , 1997 .

[6]  T. Tien,et al.  Effect of the Grain Boundary Thermal Expansion Coefficient on the Fracture Toughness in Silicon Nitride , 1995 .

[7]  M. A. Rodríguez,et al.  Single crystal ß‐Si3N4 fibers obtained by self‐propagating high temperature synthesis** , 1995 .

[8]  Chun-Hway Hsueh,et al.  Using Microstructure to Attack the Brittle Nature of Silicon Nitride Ceramics , 1995 .

[9]  Tetsuo Yamada.  Preparation and evaluation of sinterable silicon nitride powder by imide decomposition method , 1993 .

[10]  M. Hoffmann,et al.  Grain Growth Studies in Si3N4-Ceramics , 1993 .

[11]  M. Vijayakumar,et al.  Self-propagating high-temperature synthesis , 1992, Journal of Materials Science.

[12]  V. Hlavácek,et al.  DENSIFICATION OF COMBUSTION-SYNTHESIZED SILICON NITRIDE , 1991 .

[13]  H. Herman.  Plasma Spray Deposition Processes , 1988 .

[14]  J. B. Holt,et al.  The Use of Exothermic Reactions in the Synthesis and Densification of Ceramic Materials , 1987 .

[15]  Y. Miyamoto,et al.  Sintering of Si3N4 Powders Synthesized by a Combustion Reaction , 1987 .

[16]  J. Moya,et al.  Elastic/plastic indentation in ceramics: a fracture toughness determination method , 1984 .

[17]  B. Lawn,et al.  A Critical Evaluation of Indentation Techniques for Measuring Fracture Toughness: II, Strength Method , 1981 .