中文摘要：

采用FAPAS法制备了超硬AlMgB14/TiB2复合陶瓷材料,分别采用扫描电镜（SEM）及能谱（EDS）,X射线衍射仪分析添加超细TiB2第二相颗粒对复合材料微观形貌及韧性的影响;通过高温摩擦磨损试验分析了复合材料在25,300,500℃下的抗磨损性能及其摩擦学特征。结果表明,添加30%（质量分数）的微纳米级TiB2后,AlMgB14/TiB2复合材料的平均硬度达32.5 GPa,断裂韧性由未添加时的3.0 MPa·m^1/2提高到3.95 MPa·m^1/2;摩擦系数在室温及300℃时介于0.4-0.55之间,500℃时达0.65左右,磨损率1.27×10^（-6）-6.62×10^（-6） mm^3/（N·m）。随着摩擦温度的升高,试样摩擦学性能发生变化,由于摩擦表面产生氧化物的润滑作用,摩擦系数在300℃时略有减小,磨损机理由室温时的磨粒磨损转变为高温下的粘着磨损脱落。

英文摘要：

Field activated and pressure assisted synthesis（FAPAS）was used for preparing ultra-hard,super-abrasive AlMgB14/TiB2 composite ceramics.The influence of the ultra-fine TiB2 particles on the microstructure and toughness of the composite was analyzed by scanning electron microscopy（SEM）,energy dispersive analysis（EDS）and X-ray diffraction（XRD）.Wear resistance and tribological characteristics of the composite were analyzed at 25,300 and 500 ℃.The results show that the average hardness of AlMgB14/TiB2 composite materials with 30 wt% ultra-fine grain addition reaches 32.5 GPa.The fracture toughness of the composite increases from 3.0 MPa·m^1/2 without TiB2 particles addition to 3.95 MPa·m^1/2.Friction coefficient ranges from 0.4 to 0.55 at room temperature and 300 ℃,and it reaches to 0.65 at 500 ℃.Wear rate ranges from 1.27×10^-6 to 6.62×10^-6 mm^3/（N·m）.With increasing the test temperature,the friction coefficient of the composite decreases slightly at 300℃ due to the lubrication of oxide formed on the surface of composite,and the wear mechanism changes from abrasive wear at room temperature to adhesive wear at high temperature.