Microstructures and ablation properties of Al-Si modified C/C composites produced by the reactive melt infiltration method

CHANG Ya-bin; SUN Wei; XIONG Xiang; PENG Zheng; CHEN Zhao-ke; WANG Ya-lei; XU Yong-long

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Article Navigation > New Carbon Mater. > 2016 > 31(6): 628-638

CHANG Ya-bin, SUN Wei, XIONG Xiang, PENG Zheng, CHEN Zhao-ke, WANG Ya-lei, XU Yong-long. Microstructures and ablation properties of Al-Si modified C/C composites produced by the reactive melt infiltration method. New Carbon Mater., 2016, 31(6): 628-638.

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Microstructures and ablation properties of Al-Si modified C/C composites produced by the reactive melt infiltration method

State key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China

Funds: International S & L Cooperation Program of China (2013DFR50370); National Natural Science Foundation of China (51405522).

Received Date: 2016-08-03
Accepted Date: 2016-12-26
Rev Recd Date: 2016-11-10
Publish Date: 2016-12-28

Abstract

Abstract

C/C composites with densities around 1.3 g/cm³ were infiltrated with Al and Si powder mixtures to densities of 1.9-2.2 g/cm³ using reactive melt infiltration to improve their anti-ablation properties. The effects of the Si/Al mass ratio, infiltration temperature, time and atmosphere on the microstructures and ablation properties of the modified composites were investigated by XRD, SEM equipped with EDS, electron-probe micro analysis and oxygen-acetylene ablation tests. Results indicate that homogeneous Al+SiC and Al₄SiC₄+SiC were respectively formed in the C/C composites after infiltration at 1 500℃ for 2 h and 1 600℃ for 6 h in argon. A gradient of SiC+Al was formed after treatment at 1 600℃ for 6 h under vacuum with the Al content decreasing from the inside to the outside of the composite. The gradient C/C modified by SiC+Al with a Si/Al ratio of 3 has the best ablation resistance of the three, with a mass ablation rate of -1.0×10^-3 g/s in an ablation test at 2 500℃ for 60 s.
- C/C composite,
- Matrix modification,
- Reactive melt infiltration,
- Al-Si-C system,
- Ablation

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References(17)

References

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