碳纤维/锂铝硅(LAS)玻璃陶瓷的界面结构及界面反应

THE INTERFACIAL STRUCTURE AND REACTION OF CARBON FIBER/LITHIUM ALUMINUM SILICATE GLASS-CERAMIC COMPOSITES

用TEM,EDAXJ SAD,XPS,SEM等手段,分别对两种成分的锂铝硅(LAS)系统玻璃陶瓷(LAS_I和LAS(?))为基材在不同热压时间下获得的具有不同强度和韧性的碳纤维补强复合材料的界面及从复合材料萃取出来的纤维表面进行了研究。短时同热压的碳纤维-LAS_I界面层窄,界面较致密,而长时同热压,界面层变宽且疏松。碳纤维-LAS(?)存在较宽的气体扩散层界面,界面区还含有由界面反应生成的NbC颗粒,较长时间的热压,界面层变窄,NbC颗粒沉积在纤维上,改善了界面结构。界面反应和界面结构的形成及其对复合材料性能的影响进行了分析和讨论。

Both the interface and the fiber surface in carbon fiber reinforced lithium aluminum silicate glass-ceramic (LAS_Ⅰand LAS_Ⅱ) composites hot-pressed in different soak time and with different strength and toughness were studied by using TEM, EDAX, SAD, SEM and XPS respectively. Hot-pressing in a shorter soak time makes the interfacial layer in C fiber-LASⅠthin and relatively compact, while hot-pressing in a longer soak time makes the interracial layer wide and loose. A wide gas diffusion layer as well as NbC grains exist at the interface of C fiber-LASⅡ. When C fiber-LASⅡ is hot-pressed for a longer soak time, the diffusion layer is thin and NbC deposites on fiber surface then the binding between C fiber and LAS matrix has improved. The interfaical reaction, the interfacial structure formation and their effect on composite properties are discussed.