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Published on: May 22, 2014
Yun Liu1, Long Ma1, Runa Dong1
1School of Materials Science and Engineering, Shandong University of Technology, Zibo 255000, China.
Cf/C-SiC composites are used in high-temperature applications due to their low density and strength. Traditional methods require high sintering temperatures and pressures, limiting their use. A new binary binder was developed using coal pitch and polysilylacetylene. This binder acts as a carbon source and SiC precursor. The composite was made using slurry impregnation and hot pressing. The result was a material with a density of 1.53 g/cm³ and bending strength of 339 MPa. The microstructure showed improved SiC integration and mechanical performance. This method reduces processing demands and opens new possibilities for composite fabrication.
Area of Science:
Background:
Cf/C-SiC composites are valued for high-temperature applications due to their low density and strength. Traditional methods require high sintering temperatures and pressures. This limits their practical use. Researchers have explored alternative fabrication routes to reduce energy input. Prior work focused on precursor-derived ceramics and C/C composites. However, sintering performance remains a challenge. The need for lower processing temperatures is clear. This gap motivated the development of a novel binder system.
Purpose Of The Study:
The study aimed to improve the sintering performance of Cf/C-SiC composites. A binary binder was proposed to lower processing demands. The binder combines coal pitch and polysilylacetylene. This mixture serves as a carbon source and SiC precursor. The goal was to integrate SiC into C/C composites effectively. The method involved slurry impregnation and hot pressing. The objective was to achieve high mechanical performance. This approach sought to enable broader engineering applications.
Main Methods:
The binary binder was composed of coal pitch and polysilylacetylene. The binder combined a carbon source with a SiC precursor. The C/C composites were prepared using a precursor-derived ceramic route. Slurry impregnation was used to introduce SiC into the matrix. Hot pressing sintering followed to consolidate the material. The composite microstructure was analyzed to assess binder effects. Density and mechanical properties were measured experimentally. The process was optimized to achieve desired performance.
Main Results:
The prepared composites had a density of 1.53 g/cm³ and bending strength of 339 ± 21 MPa. The binary binder successfully introduced SiC into the C/C matrix. The microstructure showed improved phase integration and densification. The mechanical properties exceeded those of traditional methods. The sintering temperature and pressure were reduced significantly. The binder enhanced structural uniformity and strength retention. The results suggest a viable alternative to conventional fabrication. This approach supports broader application in high-temperature settings.
Conclusions:
The binary binder system enabled lower sintering temperatures and pressures. The resulting composites exhibited high bending strength and low density. The SiC phase was successfully integrated into the C/C matrix. The microstructure showed favorable characteristics for mechanical performance. The method offers a novel fabrication route for Cf/C-SiC composites. The findings align with the authors' goal of improving process efficiency. The results suggest broader applicability in engineering contexts. This work contributes to the development of advanced composite materials.
The binary binder combines coal pitch and polysilylacetylene to act as a carbon source and SiC precursor, enabling lower sintering temperatures and pressures while enhancing mechanical performance.
The method uses a binary binder to introduce SiC into C/C composites, reducing the need for high sintering temperatures and pressures compared to conventional approaches.
SiC improves thermal stability and mechanical strength, making the composite suitable for high-temperature load-bearing applications.
The binder promotes uniform phase distribution and densification, leading to enhanced mechanical properties and structural integrity.
The bending strength indicates the composite's ability to withstand mechanical stress, a key factor for structural applications.
The authors suggest this approach provides a novel route for fabricating low-density, high-strength composites suitable for engineering use.