为解决C/C复合材料的高温易氧化问题,依次采用前驱体浸渍裂解、反应熔体浸渗和料浆涂刷法在C/C复合材料表面制备HfB2-WB2-Si/SiC-SiCNW复合涂层.考察SiC涂层、HfB2-WB2-Si/SiC涂层和HfB2-WB2-Si/SiC-SiCNW涂层C/C复合材料在l 500℃静态空气中的抗氧化性能.结果表明:HfB2-WB2-Si/SiC-SiCNW涂层抗氧化效果优于HfB2-WB2-Si/SiC涂层和SiC涂层,前者试样氧化20 h后增重0.1％,后两者则分别失重0.9％和22.8％.HfB2-WB2-Si/SiC-SiCNW涂层较好的抗氧化性能主要归因于涂层氧化形成的连续、具有较好流动性的HfSiO4-SiO2-WO3复相玻璃以及SiC纳米线(SiCNW)对涂层的增韧作用,前者有效抑制了氧气向C/C复合材料基体内部的扩散,后者则使涂层内部裂纹的数量和尺寸明显减小.
To solve the oxidation problem of C/C composites at high temperature,a HfB2-WB2-Si/SiC-SiCNW composite coating was prepared on C/C composites by precursor infiltration and pyrolysis(PIP),reactive melt infiltration and slurry brushing successively.The oxidation resistance of the SiC,HfB2-WB2-Si/SiC and HfB2-WB2-Si/SiC-SiCNW coated C/C composites were tested in static air at 1 500 ℃.The results show that the anti-oxidation property of the HfB2-WB2-Si/SiC-SiCNW coating is better than that of the HfB2-WB2-Si/SiC and SiC coatings.After oxidation for 10 h,the weight of the former speciments is increased by 0.1％,but the weight of the latter two are decreased by 0.9％ and 22.8％,respectively.The excellent oxidation resistance of the HfB2-WB2-Si/SiC-SiCNW coating can be attributed to the formation of continuous HfSiO4-SiO2-WO3 multiphase glass layer with good fluidity and the reinforcing function of SiC nanowires (SiCNW) to the coating.The former effectively retards the diffusion of oxygen to the inner matrix and the latter obviously reduces the number and size of the cracks within the coating.
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