Journal
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
Volume 29, Issue 10, Pages 2141-2150Publisher
ELSEVIER
DOI: 10.1016/S1003-6326(19)65120-4
Keywords
C/C-ZrB2-SiC composites; microstructure; mechanical properties; ablation properties
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Funding
- National Basic Research Program of China [GFZX0101040101-2012C20X]
- Natural Science Foundation of Hunan Province, China [2017JJ2320]
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Ultrahigh-temperature ceramics were added to C/C composites to meet their application requirement in a high-temperature oxidizing environment. C/C-ZrB2-SiC composites were fabricated by high-solid-loading slurry impregnation with polymer infiltration and pyrolysis. The dispersion and rheological behavior of ZrB2 slurry and the microstructural, mechanical, and ablation properties of the C/C-ZrB2-SiC composites were investigated. Results indicated that a well-dispersed and low-viscosity ZrB2 slurry was obtained using 0.40 wt.% polyethyleneimine as a dispersant at pH 5. Ceramics were uniformly distributed in the short-cut fiber layer and needle-punched area. The flexural strength of the C/C-ZrB2-SiC composites was 309.30 MPa. The composites exhibited satisfactory ablation resistance under the oxyacetylene flame of 2500 degrees C, and the mass and linear ablation rates were 0.40 mg/s and 0.91 mu m/s, respectively. A continuous and compact ZrO2 layer, which could effectively reduce the diffusion rate of oxygen and protect the composites from being ablated, was formed.
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