甄霞丽,裴学良,王艳菲,何流,黄政仁,黄庆
ZHEN Xia-li,PEI Xue-liang,WANG Yan-fei,HE Liu,HUANG Zheng-ren,HUANG Qing

• 1:中国科学院宁波材料技术与工程研究所先进能源材料工程实验室

摘要(Abstract)：

以SiC陶瓷前驱体——聚碳硅烷(PCS)的纤维为原料,经臭氧不熔化和热解至1 600℃获得多孔结构的碳化硅(SiC)纤维。采用扫描电镜、X射线衍射仪、元素分析仪和比表面积与孔径分析仪等研究了臭氧不熔化时间和热解温度对纤维形貌与组成的影响。结果表明:当热解温度从1 300℃提升至1 600℃,SiC纤维呈现出氧元素含量显著降低,比表面积显著增加,形态从无定形转化为结晶形态,以及SiC纤维壁形成多孔结构且孔径从外到内呈梯度缩小等变化;当臭氧不熔化时间为20 min时,所得的多孔结构的SiC纤维还具有中空结构,比表面积为10.45 m~2/g,纤维壁富含尺寸介于2～30 nm的介孔。
Silicon carbide(SiC) fibers with porous structure were prepared from the SiC ceramic precursorpolycarbosilane(PCS)fibers by ozonation curing and then pyrolysis to 1600 ℃. Effects of ozone curing time and pyrolysis temperature on fiber morphology and composition were investigated by SEM, XRD, elemental analyzer and surface area and pore size analyzer. The results showed that when the pyrolysis temperature was raised from 1300 ℃ to 1600 ℃, many obvious changes were found in SiC fibers, such as a significant decrease in oxygen content, a significant increase in specific surface area, the transformation from amorphous to crystalline, the formation of porous structure in the walls, and the gradient reduction in pore size from outside to inside. When the ozone curing time was 20 min, the porous SiC fibers with a specific surface area of 10.45 m~2/g and mesopores in the range of 2～30 nm also had a hollow structure.

关键词(KeyWords)： 中空SiC纤维;多孔结构;不熔化程度
hollow SiC fiber;porous structure;curing degree

Abstract:

Keywords:

基金项目(Foundation): 宁波市科技创新2025重大专项(项目编号2019B10091);; 宁波市“3315计划”创新团队项目(项目编号.2018A-03-A)

作者(Author): 甄霞丽,裴学良,王艳菲,何流,黄政仁,黄庆
ZHEN Xia-li,PEI Xue-liang,WANG Yan-fei,HE Liu,HUANG Zheng-ren,HUANG Qing

DOI: 10.16090/j.cnki.hcxw.2021.01.007

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