摘要
利用 Al_2O_3和 Y_2O_3为烧结助剂,通过热压烧结工艺制备了碳纤维增强碳化硅复合材料。结果表明:球磨工艺有助于短切碳纤维的均匀分散。烧结过程中,烧结助剂 Al_2O_3、Y_2O_3之间发生化学反应,促进液相烧结,并形成晶界间的次晶相YAG,有利于提高复合材料的断裂韧性。在较高烧结温度下,碳纤维与烧结助剂以及基体之间反应,形成过强结合界面,纤维性能降低,不利于复合材料力学性能的提高。
The C/SiC composites were prepared by hot-pressing sintering method with Al2O3、and Y2O3as additives. Results show that ball milling technology is beneficial to homogeneous dispersion of carbon fiber. Chemical reaction between additives Al2O3 and Y2O3 was mainly attributed to the liquid phase sintering and the formation of the YAG non-crystalline, which helps to improve fracture toughness of C/ SiC composites. Higher sintering temperature was attributed to the strongly bonded fiber/ matrix interface and resulted in the degradation of the fibers,which is harmful to mechanical properties of C/SiC composites.
出处
《兵器材料科学与工程》
CAS
CSCD
北大核心
2008年第2期20-22,共3页
Ordnance Material Science and Engineering
关键词
纤维增强
显微结构
界面
碳化硅
复合材料
fiber reinforcement
micrestructures
interfaces
silicon carbon
composites
