【摘要】 采用料浆法在碳/碳复合材料碳化硅(SiC)内涂层表面制备了Al-Si合金外涂层,采用XRD和SEM分析了涂层的微观结构,并测试了带有SiC/Al-Si复合涂层的碳/碳复合材料试样在1500℃静态空气中的抗氧化性能。结果表明:Al-Si合金外涂层主要成分为Al3.21Si0.47,含有少量Al2O3;SiC/Al-Si复合涂层厚度约为120μm,无穿透性裂纹;SiC/Al-Si复合涂层的抗氧化性能明显优于单一SiC涂层,氧化17h后涂层试样的质量损失未超过5%。更多还原

【Abstract】 Al-Si alloy coating was prepared on the surface of SiC coated carbon-carbon composites by slurry method.Microstructure and oxidation resistance of as-prepared SiC/Al-Si multi-layer coating were studied by XRD,SEM,and isothermal oxidation test under 1500℃ in air respectively.The results showed that Al3.21Si0.47 and a few Al2O3 were the main phase of Al-Si outer coating.The thickness of SiC/Al-Si multi-layer coating was about 120μm and without penetrable cracks.The oxidation resistance of SiC/Al-Si multi-layer coating was obviously better than that of single SiC coating.The mass loss of SiC/Al-Si multi-layer coated carbon-carbon composites was less than 5%(mass fraction) after oxidation for 17h.更多还原