Mechanical and ablative properties of C/C composites modified by SiC using liquid silicon infiltration method
- Paper number
IAC-17,C2,4,4,x40201
- Author
Mr. JinHuang Zheng, China
- Coauthor
Prof. Hong Cui, China
- Year
2017
- Abstract
SiC modified C/C (C/C-SiC) composites were prepared through incorporating SiC matrix into porous C/C composites using liquid silicon infiltration (LSI) method. The porous C/C composites with a density of 0.96,1.31,1.50,1.68, and 1.81 g/cm3 were produced by a sequent processing of isothermal chemical vapor infiltration and polymer impregnation and pyrolysis using carbon fiber needle felts as the performs. The initial density of the performs was 0.56g/cm3. The mechanical and ablative properties of C/C-SiC composites were investigated using three-point flexural testing and oxyacetylene torch flame. Results show that C/C-SiC composites posses excellent ablation resistance and can be used in the ablation environment of 2100 ℃ for long time, compared with C/C composites. The composites with the density of 2.0 g/cm3 exhibit relatively superior mechanical and ablative properties, which is prepared from The porous C/C composites of the density 1.81 g/cm3. The corresponding flexural strength of the composites reaches 142.6 MPa under normal temperature, while the mass ablation rate is 0.6×10-4 g/s under the ablation temperature of 2100 ℃ holding for 600 s.
- Abstract document
- Manuscript document
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