Effects of Pressure during Preform Densification on SiC/SiC Composites

Naofumi Nakazato, Akira Kohyama, Yutaka Kohno

College of Design and Manufacturing Technology, Muroran Institute of Technology, Muroran, Japan.
Graduate School of Chemical and Materials Engineering, Muroran Institute of Technology, Muroran, Japan.
Organization of Advanced Sustainability Initiative for Energy System/Materials (OASIS), Muroran Institute of Technology, Muroran, Japan.

DOI: 10.4236/ojinm.2013.31003                

Abstract

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.

Keywords

SiC/SiC Composites; NITE Method; Near-Net Shaping; Preform Densification

Conflicts of Interest

The authors declare no conflicts of interest.

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