采用化学气相渗透(CVI)结合溶液浸渍法制备3D-C/SiC-(W-C)多元基复合材料,利用XRD、SEM技术对材料烧蚀前后的物相组成及微观结构进行表征,并讨论了复合材料的烧蚀性能.结果表明,3D-C/SiC-(W-C)复合材料的主要成分为WC、W、SiC和C,而烧蚀表面的主要成分为WO3、w和SiC.W-C不仅渗入纤维束间,还渗入到纤维束内.制得的C/SiC-(W-C)复合材料密度为3.3g/cm3,开气孔率为11%,其线烧蚀率和质量烧蚀率分别为4.3×10-2mm/s和7.2×10-3g/s.
A 3D C/SiC-(W-C) composite was prepared by combining chemical vapor infiltration (CVI) technology with solution impregnation method. The phase composition and microstructure of the composite before and after ablation were investigated by XRD, and SEM, respectively. The ablation properties of as-prepared C/SiC-(W-C) composite were studied.The XRD results show that the main phases of the as-prepared composite are WC, W, SiC and C while those of the ablated surface are WO3, W and SiC. SEM analysis implies that not only inter-bundle pores but also intra-bundle pores are filled by W-C. The as-prepared C/SiC-(W-C) composite attains a density of 3.3 g/cm3 with the apparent porosity of 11%. Its linear and mass ablation rates are 4. 3×10-2mm/s and 7. 2 × 10-3g/s, respectively.
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