Ti_3AlC_2陶瓷的制备及其摩擦磨损性能

Fabrication of Ti_3AlC_2 by Reactive Sintering and Its Friction and Wear Behavior

以钛、铝、碳粉为反应物原料,采用反应烧结技术制备了Ti3AlC2陶瓷,研究了各工艺参数对制备试样物理性能的影响,同时也对其摩擦磨损性能进行了分析。实验结果表明:按照摩尔比x(Ti):y(Al):z(C)=3.0:1.2:2.0的配比进行反应烧结,在1 300℃烧结0.5 h,能够制备出高纯致密的Ti3AlC2陶瓷,其质量含量高达94.6%,孔隙率为9.4%。当烧结温度过低时,得到的Ti3AlC2陶瓷含量较低,且杂质较多;当烧结温度过高时,会导致Ti3AlC2陶瓷发生分解反应。当载荷较小时,Ti3AlC2陶瓷磨损以磨损面的解理流变和粒子脱落造成的磨粒磨损为主;而载荷较大时,其磨损机理以轻微划痕和轻微黏着磨损为主。

A ceramic material of Ti3AlC2 was sintered with Ti,Al and C powders as raw materials by a reaction sintering technology.Effect of process parameters on the physical properties of the ceramic material was investigated.The friction and wear behavior of the prepared material was analyzed.The results demonstrate that Ti3AlC2 ceramic material with a high density is fabricated by the reac-tive sintering at a molar ratio of Ti/Al/C of 3.0：1.2：2.0 and 1 300 ℃ for 0.5 h.The content of Ti3AlC2 in the material was 94.6%,and the porosity was only 9.4%.The content of Ti3AlC2 was lower at a lower sintering temperature.A higher sintering temperature could lead the material to be composed.The main wear mechanism at a lower load was an abrasive wear that was caused by the shedding of Ti3AlC2 particles and the rheologic behavior of worn surface.The wear mechanism at a higher load was scratch and slight adhesive wear.