聚丙烯腈基炭纤维表面电沉积 Ni-Fe合金的催化石墨化性能

在聚丙烯氰基炭纤维上电沉积Ni-Fe合金催化剂,并采用x-射线衍射和拉曼光谱方法考察其对热处理炭纤维石墨化的催化性能.结果表明:Ni-Fe合金在低温条件下对炭纤维石墨化有着优异的催化性能.附有Ni-Fe合金(铁的质量分数为57.91%)的聚丙烯腈基炭纤维经过1250℃热处理后其石墨化度为69.0%,而空白样炭纤维经过2...     

碳纤维表面电沉积合金（复合）镀层初步研究

采用电化学沉积的方法,在聚丙烯腈基碳纤维表面制备了Ni–Fe、Fe–P、Ni–B合金及Fe–Cr2O3复合镀层。结果表明:碳纤维表面的预处理对合金(复合)镀层与基底间的结合力有重要影响。扫描电子显微镜结果显示,未经活化处理的碳纤维表面镀层与基体的结合力差,表面有裂纹;表面活化处理后的镀层细致,均匀,结合力好。通过改变与合金元素相应的电解质浓度可改变镀层中合金元素的含量,获得具有不同合金含量的、与碳纤维结合紧密的合金或复合镀层。     

Catalytic graphitization of polyacrylonitrile-based carbon fibers coated with Prussian blue

Prussian blue (PB) was used as catalyst to improve the extent of graphitization of polyacrylonitrile (PAN)-based carbon fibers. PB was deposited on carbon fibers by anodic electrodeposition and the thickness of PB coating (PB content) was controlled by adjusting the electrodeposition time. PAN-based carbon fibers with PB coating were heat-treated and the extent of graphitization was measured by X-ray diffractometry and Raman spectroscopy. The results indicate that the extent of graphitization of PAN-based carbon fibers is enhanced in the presence of the coating. When the PB-coated carbon fibers were heat-treated at 1 900 °C, interlayer spacing (d ₀₀₂) and crystallite size (L _c) reach 0.336 8 and 21.2 nm respectively. Contrarily, the values of d ₀₀₂ and L _c are 0.341 4 and 7.4 nm respectively when the bare carbon fibers were heat-treated at 2 800 °C. Compared with the bare carbon fibers, PB can make the heat treatment temperature (HTT) drop more than 500 °C in order to reach the same extent of graphitization. Furthermore, the research results show that PB content also has a certain influence on the extent of graphitization at the same HTT.