研究二氧化硅微米粉和纳米粉质量分数分别为6%,12%,18%和24%时所形成的防氧化涂层对炭/炭复合材料抗氧化性能的影响,并对涂层氧化前后的组成、形貌变化进行X射线衍射分析(XRD)和扫描电子显微镜分析(SEM).结果表明:随着SiO_2微米粉含量的增加,涂层氧化失重率先减后增,其最佳含量为18%,氧化失重率0.38%;而添加SiO_2纳米粉涂层则随着含量的增加,氧化失重率增加,其含量最低为6%时,氧化失重率最小,为2.88%.
The influence of protective coatings formed of micron silicon dioxide(SiO_2) and nanometer silicon dioxide (SiO_2) on the anti-oxidation property of carbon/carbon composite, with the content of 6%, 12%, 18% and 24% percent respectively was investigated.And the components and the morphologies of protective coatings fore-and-aft- oxidation were also discussed contrastively with the X-ray diffraction (XRD) and the scanning electron microscope(SEM).The results showed that as the content of micron SiO_2 increasing, ratios of oxidized mass loss on the carbon/carbon composite protective coating reduced first, then increased, whose best content was 18% with the ratio of oxidized mass loss of 0.38%.While as the content of nanometer SiO_2 increasing, ratios of mass loss increased all along. The lowest ratio of oxidized mass loss was 2.88% with the smallest content of 6%.
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