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.
Highlights
SiC/SiC composites are promising high-temperature structural materials for advanced nuclear and aero-space applications
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
Summary
SiC/SiC composites are promising high-temperature structural materials for advanced nuclear and aero-space applications. Large volumetric shrinkage (−50 vol%) occurs during ceramic matrix composites fabrication by hot-pressing like NITE method. This volumetric shrinkage is caused due to infiltration and densification process of powder for matrix formation, resulting in significant fiber-architecture and strength damage. The method development for suppression of large volumetric shrinkage during hot-pressing is essential to fabricate the production of complex shape by the damage-less near-net shaping, and one of method for that is preform densification before hot-pressing. The preform densification demonstrated the maintainability of fiber-architecture in composites due to suppression of large volumetric shrinkage and the improvement of composites’ density and mechanical properties [10]. Optimization of conditions (temperature, holding time and applied pressure) during preform densification is insufficient
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