论文部分内容阅读
用无压浸渗法制备了B4C/Al复合材料。采用X射线衍射仪、能谱仪、扫描电镜、透射电镜以及光学显微镜对复合材料的相及其微观组织进行了观察及分析。结果表明,在B4C/Al复合材料中,Al3BC相沿碳化硼和铝的界面生长,增加了碳化硼和铝的界面结合强度;AlB2是类似棒状的长条晶体,嵌于碳化硼和铝之间,当材料受外力冲击时起增韧作用。该复合材料中碳化硼以连续的骨架结构存在,而渗入的铝相也以连续基体的形式存在,形成了双连续骨架结构。该复合材料的断裂方式是沿陶瓷骨架的穿晶断裂和金属铝的桥接断裂。
B4C / Al composites were prepared by pressureless infiltration method. The phase and microstructure of the composites were observed and analyzed by XRD, EDS, SEM, TEM and optical microscope. The results show that the Al3BC phase grows along the interface between boron carbide and aluminum in B4C / Al composites, which increases the interfacial bonding strength between boron carbide and aluminum. AlB2 is a bar-like elongated crystal embedded between boron carbide and aluminum. When the material by the impact of external toughening role. The boron carbide in the composite material exists in a continuous framework structure, and the infiltrated aluminum phase also exists in the form of a continuous matrix, forming a bicontinuous framework structure. The fracture mode of the composite material is the transgranular fracture along the ceramic framework and the bridging fracture of metallic aluminum.