不同粒度二氧化硅粉末对炭/炭复合材料防氧化涂层的影响

Influence of Silicon Dioxide Powder with Different Granularity on Carbon/Carbon Composite Oxidation Protective Coating

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SiO2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SiO2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（SiO2） and nanometer silicon dioxide（SiO2） 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 SiO2 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 SiO2 increasing,ratios of mass loss increased all along.The lowest ratio of oxidized mass loss was 2.88% with the smallest content of 6%.