超细TiB_2对AlMgB_(14)/TiB_2力学性能及抗高温磨损性能的影响  

Effects of Ultra-Fine Grained TiB_2 on AlMgB_(14)/TiB_2 Mechanical Properties and High-Temperature Wear Resistance

作　　者：雷煜[1] 孟庆森[1,2] 庄蕾[1] 陈少平[1] 程慧玲[1] 戴景杰[2] 

机构地区：[1]太原理工大学,山西太原030024 [2]青岛滨海学院,山东青岛266555

出　　处：《稀有金属材料与工程》2016年第3期737-741,共5页Rare Metal Materials and Engineering

基　　金：国家青年科学基金(51101111);山西省回国留学人员科研资助项目;山西省青年科技研究项目(2011021022-3)

摘　　要：采用FAPAS法制备了超硬AlMgB_(14)/TiB_2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TiB_2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TiB_2后,AlMgB_(14)/TiB_2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。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.

关 键 词：AlMgB14/TiB2 复合材料 抗磨损 韧性 高温 摩擦学 

分 类 号：TQ174.1[化学工程—陶瓷工业] TB33[化学工程—硅酸盐工业]