新型炭材料
新型炭材料
신형탄재료
NEW CARBON MATERIALS
2014年
1期
41-46
,共6页
吴刚平%李登华%杨禹%吕春祥%张寿春%徐耀%李秀涛%冯志海%李志宏%吴中华
吳剛平%李登華%楊禹%呂春祥%張壽春%徐耀%李秀濤%馮誌海%李誌宏%吳中華
오강평%리등화%양우%려춘상%장수춘%서요%리수도%풍지해%리지굉%오중화
炭纤维%小角X射线散射%炭层结构%石墨化
炭纖維%小角X射線散射%炭層結構%石墨化
탄섬유%소각X사선산사%탄층결구%석묵화
Carbon fibers%Small-angle X-ray scattering%Carbon layer structures%Graphitization
将聚丙烯腈基炭纤维在石墨化炉中维持定长加热，以模拟炭/炭复合材料制备过程中炭纤维结构的变化，并采用小角X射线散射( SAXS)和高分辨透射电子显微镜( HRTEM)检测石墨化过程中的结构演变。随着温度的提高炭纤维中微孔的平均回转半径、长度、宽度、截面积和体积分数呈现先减小后增大的趋势，并在约2300益出现极小值。炭纤维中孔隙尺寸的变化与炭层片的活动性密切相关。炭层的缩合和有序化导致孔隙率的减小，而炭层在更高温的簇状化导致孔隙尺寸的增大。
將聚丙烯腈基炭纖維在石墨化爐中維持定長加熱，以模擬炭/炭複閤材料製備過程中炭纖維結構的變化，併採用小角X射線散射( SAXS)和高分辨透射電子顯微鏡( HRTEM)檢測石墨化過程中的結構縯變。隨著溫度的提高炭纖維中微孔的平均迴轉半徑、長度、寬度、截麵積和體積分數呈現先減小後增大的趨勢，併在約2300益齣現極小值。炭纖維中孔隙呎吋的變化與炭層片的活動性密切相關。炭層的縮閤和有序化導緻孔隙率的減小，而炭層在更高溫的簇狀化導緻孔隙呎吋的增大。
장취병희정기탄섬유재석묵화로중유지정장가열，이모의탄/탄복합재료제비과정중탄섬유결구적변화，병채용소각X사선산사( SAXS)화고분변투사전자현미경( HRTEM)검측석묵화과정중적결구연변。수착온도적제고탄섬유중미공적평균회전반경、장도、관도、절면적화체적분수정현선감소후증대적추세，병재약2300익출현겁소치。탄섬유중공극척촌적변화여탄층편적활동성밀절상관。탄층적축합화유서화도치공극솔적감소，이탄층재경고온적족상화도치공극척촌적증대。
Polyacrylonitrile-based carbon fiber bundles, with two sides fixed, were heated in a graphitization furnace with temper-ature profiles similar to those used in the preparation of carbon/carbon composites. The microstructure of the microvoids formed was characterized by small-angle X-ray scattering and high resolution transmission electron microscopy ( HR-TEM) . Results showed that the average radius of gyration of the microvoids decreases, and their length, width, cross-sectional area and volume fraction de-crease followed by a slight increase with increasing temperature, with the minima found at around 2300℃. The HR-TEM images showed that the microvoids were formed by stacking defects of the carbon layers. The ordering of the amorphous carbon layers ac-counted for the initial decrease of size and volume fraction of the voids with increasing temperature, while the growth and ordering of the layers at high temperatures gave rise to increases in their size and volume fraction.
