1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China; 2. Hunan Boyun New Materials Co., Ltd., Changsha 410205, China
Abstract:In order to improve the ablation resistance of C/C-SiC composites, ZrC nano-powder modified C/C-SiC composites were prepared by the reactive melt infiltration (RMI) with ZrC nano-powder and Si powder as raw materials. X-ray diffraction, scanning electron microscopy, and energy dispersive spectrometer were used to investigate the effects of ZrC nano-powder contents on the microstructure and ablation properties of C/C-SiC composites. The results indicate that with the increase of ZrC nano-powder content, the porosity of the composite increases, but the density changes little. Meanwhile, part of ZrC nano-powders are diffusely distributed in the SiC matrix, and part of them are agglomerated. After ablation for 30 s, when the mole fraction of ZrC nano-powder is 6%, the composite exhibits the lowest mass and linear ablation rates of 2.0 mg/s and 3.9 μm/s, respectively. And with the increase of ZrC nano-powder content, the content of ZrO2 formed during ablation increases, this leads to a notable enhancement in the pinning effect on SiO2, effectively improving the ablation resistance of C/C-SiC composites.
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