The nano-infiltration and transient eutectic-phase (NITE) method is one of the most attractive methods for fabrication of SiC and SiC/SiC composites. In the NITE method, preform densification is essential option for damage less near-net shaping technique. However, optimization of preform densification is insufficient yet. The objective of this study is to evaluate the effects of pressure during preform densification on SiC/SiC composites. The preform before preform densification has many pores in the inter-prepreg sheets. These pores were disappeared by preform densification. As the effects of pressure on preform, densification in the intra-fiber-bundle was improved due to increasing pressure. Flexural strength of the preforms with 1 MPa and 17 MPa indicated almost same value. The result suggested that increasing of pressure did not cause any change in fiber properties. In the effects of pressure on the composites, the composites with 17 MPa was exhibited improvement in bulk density and mechanical property, compared with that with 1 MPa.
Cite this paper
N. Nakazato, A. Kohyama and Y. Kohno, "Effects of Pressure during Preform Densification on SiC/SiC Composites," Open Journal of Inorganic Non-metallic Materials, Vol. 3 No. 1, 2013, pp. 10-13. doi: 10.4236/ojinm.2013.31003.
 C. R. Naslain, “Design, Preparation and Properties of Non-Oxide CMCs for Application in Engines and Nuclear Reactors: An Overview,” Composites Science and Technology, Vol. 64, No. 2, 2004, pp. 155-170.
 B. Riccardi, L. Giancarli, A. Hasegawa, Y. Katoh, A. Kohyama, R. H. Jones and L. L. Snead, “Issue and Advances in SiC/SiC Composites Development for Fusion Reactors,” Journal of Nuclear Materials, Vol. 329-333, 2004, pp. 56-65.
 Y. Katoh, L. L. Snead, C. H. Henager Jr., A. Hasegawa, A. Kohyama, B. Riccardi and H. Hegeman, “Current Status and Critical Issues for Development of SiC Composites for Fusion Applications,” Journal of Nuclear Materials, Vol. 467-370, No. Part A, 2007, pp. 659-671.
 H. Araki, W. Yang, H. Suzuki, Q. Hu, C. Busabok and T. Noda, “Fabrication and Flexural Properties of Tyranno-SA/SiC Composites with Carbon Interlayer by CVI,” Journal of Nuclear Materials, Vol. 329-333, 2004, pp. 567-571.
 R. Jones, A. Szweda and D. Petrak, “Polymer Derived Ceramic Matrix Composites,” Composites: Part A, Vol. 30, No. 4, 1999, pp. 569-575.
 A. Sayano, C. Sutoh, S. Suyama, Y. Itoh and S. Nakagawa, “Development of a Reaction-Sintered Silicon Carbide Matrix Composite,” Journal of Nuclear Materials, Vol. 271&272, 1999, pp. 467-471.
 A. Kohyama, S. M. Dong and Y. Katoh, “Development of SiC/SiC Composites by Nano-Infiltration and Transient Eutectoid (NITE) Process,” Ceramic Engineering and Science Proceedings, Vol. 23, No. 3, 2002, pp. 311-318.
 Y. Katoh, S. M. Dong and A. Kohyama, “Thermo-Mechanical Properties and Microstructure of Silicon Carbide Composites Fabricated by Nano-Infiltrated Transient Eutectoid Process,” Fusion Engineering and Design, Vol. 61-62, 2002, pp. 723-731.
 K. Shimoda, A. Kohyama and T. Hinoki, “High Mechanical Performance SiC/SiC Composites by NITE Process with Tailoring of Appropriate Fabrication Temperature to Fiber Volume Fraction,” Composites Science and Technology, Vol. 69, No. 10, 2009, pp. 1623-1628.
 N. Nakazato, H. Kishimoto, K. Shimoda, J. S. Park, H. C. Jung, Y. Kohno and A. Kohyama, “Effects of Preform Densification on Near-Net Shaping of NITE-SiC/SiC Composites,” IOP Conference Series: Materials Science and Engineering, Vol. 18, No. 20, 2011.
 N. Nakazato, H. Kishimoto, K. Shimoda, J. S. Park, H. C. Jung, Y. Kohno and A. Kohyama, “Effects of Preform Densification on Microstructure and Mechanical Properties of SiC/SiC Composites,” Journal of the Japan Institute of Metals, Vol. 75, No. 3, 2011, pp. 146-151.
 K. Shimoda, T. Hinoki and A. Kohyama, “Effect of Additive Content on Transient Liquid Phase Sintering in SiC Nanopowder Infiltrated SiCf/SiC Composites,” Composites Science and Technology, Vol. 71, No. 5, 2011, pp. 609-615.