B4C／Al复合材料的制备工艺和组织研究

Study on Process and Microstructure of B4C/Al Composite

研究了用无压浸渗法制备的B1C/Al复合材料的制备工艺和组织。通过对碳化硼陶瓷预制体成型压力和保压时间的控制，采用X射线衍射、扫描电子显微镜及能谱仪分别对B1C／Al复合材料的相组成、微观形貌和微区成分进行分析。结果表明：成型压力为100MPa，保压时间选择1．5min，预烧温度在1700℃时，可以制得组织致密、均匀的B1C／Al复合材料。金属铝在高温下浸渗时与碳化硼陶瓷骨架反应生成Al3BC，AlB2，Al2C3等陶瓷相。Al3BC和AlB2为主要反应产物。B4C／Al复合材料中碳化硼是以连续的骨架结构存在，渗入的铝相则以连续基体的形式铺满整个组织。

：The process, microstructure and properties of B4 C/AI composite prepared by pressureless infiltration technology was studied. The shaping press and time holding of boron carbide perform were controlled. The B4C/Al composite was characterized by means of X--ray diffraction （XRD）, scanning electron microscopy（SEM） and energy diffraction spectrum （EDS）. The results show that B4C/A｜ composite with excellent texture can be prepared when the shaping press is 100MPa with time holding for 1.5min and sintered at 1700℃. In the processing of infiltration at high tempeture, the aluminum react with boron carbide skeleton resulted in Al3BC, AlB2, Al4C3. Al3BC and AlB2 is the main reaction product. The boron carbide exists in continuous skeleton structure form, and the aluminum infiltrating into exists in continuous matrix form in the B1C/Al composite.