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超细TiB2对AlMgB14-TiB2力学性能及抗高温磨损性能的影响
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太原理工大学材料科学与工程学院,太原理工大学,青岛滨海学院

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国家自然科学基金资助(50975190,51101111),山西省青年科学研究基金(2011021022-3)


Effects of ultra-fine grained TiB2 on AlMgB14-TiB2 mechanical properties and resistance to high-temperature wear properties
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Taiyuan University of Technology,1 Taiyuan University of Technology, Taiyuan 030024, China; 2 Qingdao Binhai University, Qingdao 266555, China)

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    摘要:

    本文采用FAPAS法制备了超硬AlMgB14∕TiB2复合陶瓷材料,分别采用扫描电镜SEM及能谱分析EDS,X射线衍射仪分析了添加超细TiB2第二相颗粒对微观形貌及复合材料韧性的影响;并通过高温摩擦磨损试验表征和分析了复合材料在25℃,300℃,500℃下的抗磨损性能及其摩擦学特征。研究结果表明,添加30 wt% 的纳米级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3.0MPa? m1/2提高到3.95MPa? m1/2 ;摩擦系数在室温及300℃时介于0.4-0.5之间,500℃时达0.65左右,磨损率1.27?0-6 mm-3/(N? m)~6.62?0-6 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,300℃时摩擦系数有所减小,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。

    Abstract:

    In this paper, the field activated and pressure assisted synthesis (FAPAS) were used for preparing the ultra-hard, super-abrasive AlMgB14∕TiB2 composite ceramic. We analyzed how the ultra-fine TiB2 particles influence microstructure and toughness of samples by using scanning electron microscopy (SEM), energy dispersive analysis (EDS) and X-ray diffraction (XRD) respectively. The wear resistence and tribological behavior of AlMgB14∕TiB2 composite materials at 25℃, 300℃,500℃ were characterized throughing high-temperature friction and wear test. The results show that the average hardness of AlMgB14∕TiB2 composite materials reached 32.5 GPa after adding 30 wt% submicron scale TiB2 particles. The fracture toughness was seen to increase from 3.0 to 3.95MPa? m1/2. Friction coefficient ranged from 0.4 to 0.5 at room temperature and 300℃ , this figure exhibited approximately 0.65 in the case of 500℃ sliding operation. The specific wear rate ranged from 1.27?0-6 mm-3/(N?m)to 6.62 mm-3/(N﹒m).With increasing the test temperature, The tribological properties of AlMgB14∕TiB2 composite materials changed, As a result of the friction surface oxide lubrication, friction coefficient decreased at 300℃,the wear mechanism from abrasive wear at room temperature to adhesive wear .

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雷煜,孟庆森.超细TiB2对AlMgB14-TiB2力学性能及抗高温磨损性能的影响[J].稀有金属材料与工程,2016,45(3):737~741.[LEI YU, Meng qingsen. Effects of ultra-fine grained TiB2 on AlMgB14-TiB2 mechanical properties and resistance to high-temperature wear properties[J]. Rare Metal Materials and Engineering,2016,45(3):737~741.]
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  • 收稿日期:2014-03-29
  • 最后修改日期:2014-05-07
  • 录用日期:2014-06-04
  • 在线发布日期: 2016-07-06
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