期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 43, 期 2, 页码 273-282出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2022.10.028
关键词
Reactive melt infiltration; C/SiC composites; Nanoporous carbon; Mechanical properties; Ablation behavior
RMI-C/SiC composites fabricated using a carbon fiber reinforced nanoporous carbon matrix preform demonstrate high performance with dense and pure SiC matrix and intact carbon fibers. In contrast, composites based on conventional pyrocarbon or resin carbon matrixes show poorer properties with less SiC, residual silicon and carbon, and corroded fibers. This work opens up a new way for the development of high-performance ceramic matrix composites by siliconizing C/C preforms with nanoporous carbon matrix.
Reactive melt infiltration (RMI) has been proved to be one of the most promising technologies for fabrication of C/SiC composites because of its low cost and short processing cycle. However, the poor mechanical and anti-ablation properties of the RMI-C/SiC composites severely limit their practical use due to an imperfect siliconi-zation of carbon matrixes with thick walls and micron-sized pores. Here, we report a high-performance RMI-C/ SiC composite fabricated using a carbon fiber reinforced nanoporous carbon (NC) matrix preform composed of overlapping nanoparticles and abundant nanopores. For comparison, the C/C performs with conventional pyrocarbon (PyC) or resin carbon (ReC) matrixes were also used to explore the effect of carbon matrix on the composition and property of the obtained C/SiC composites. The C/SiC derived from C/NC with a high density of 2.50 g cm(-3) has dense and pure SiC matrix and intact carbon fibers due to the complete ceramization of original carbon matrix and the almost full consumption of inspersed silicon. In contrast, the counterparts based on C/PyC or C/ReC with a low density have a little SiC, much residual silicon and carbon, and many corroded fibers. As a result, the C/SiC from C/NC shows the highest flexural strength of 218.1 MPa and the lowest ablation rate of 0.168 mu ms(-1) in an oxyacetylene flame of similar to 2200 degrees C with a duration time of 500 s. This work opens up a new way for the development of high-performance ceramic matrix composites by siliconizing the C/C preforms with nanoporous carbon matrix.
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