摘要
运用两种不同技法制备了ZrO2纳米粒子改性的膨化石墨/焦炭复合材料,应用XRD、SEM和TEM对所得ZrO2改性炭材料进行了表征。技法1:在ZrO(NO3)2及NH4OH溶液中反复交替地浸渍低密度膨化石墨/焦炭块体,随后在1200℃氮氛中热处理,以使在炭块自由表面沉积ZrO2纳米粒子的薄层。技法2:将可膨胀石墨、酚醛树脂粉和ZrOC2O4—改性的纤维素纤维混合物封装于一容器中,使之经受900℃热激震,随后在氮氛中1200℃热处理,获得改性复合材料。结果表明:复合材料中ZrO2纳米粒子呈现三种尺寸:6nm^30nm为单独的纳米粒子和小微粒;200nm^1000nm为长树突状结构物;1μm^40μm为形如纤维素前驱体的杆状物。
Exfoliated graphite/coke composites modified by ZrO2 nanoparticles were produced using two different techniques and characterized by means of Xray diffraction, scanning and transmission electron microscopy. In the first, lowdensity exfoliated graphite/coke blocks were dipped repeatedly and alternately in ZrO（NO3）2 and NH4OH solutions and subsequently heat treated at 1200℃ in nitrogen to deposit thin layers of ZrO2 nanoparticles on the free surfaces of the carbon matrix. In the second, a mixture of expandable graphite, phenolformaldehyde resin powder, and ZrOC2O4modified fibrous cellulose in a sealed container was submitted to thermal shock at 900℃ followed by heat treatment at 1200℃ in nitrogen to obtain the modified composites. The ZrO2 nanoparticles formed in the second technique were incorporated into the composites in three length scales： 630nmisolated nanoparticles and small blobs, 2001000nmlengthy dendritelike structures, and thin layer adhering to the surface of the 140μm long cellulose carbon fibers.
出处
《新型炭材料》
SCIE
EI
CAS
CSCD
北大核心
2010年第4期255-260,共6页
New Carbon Materials
