三维针刺C/SiC复合材料与30CrSiMoVA对偶的摩擦磨损性能与机理

摘要

The tribological properties of the couple of three-dimensional needled C/SiC composite and 30CrSiMoVA were investigated on MM-1000 II friction testing machine. The wear mechanisms and phase transformation were analysed with SEM, XRD, EDS, thermodynamics, and finite element simulation of braking temperature field. The results show that,with the increase of the initial braking speed, the average friction coefficient of the couple of three-dimensional needled C/SiC composite and 30CrSiMoVA decreases, the temperature of friction surface increases, and the linear wear rate of three-dimensional needled C/SiC composite and 30CrSiMoVA tended to increase. When the initial braking speed is greater than 15m/s, the maximum temperature on the friction surface exceeds 560 ℃ . Besides, Fe3C, Fe3Si, FeO, γ-Fe2O3and a-Fe2O3 was found, which was supposed come from the reactions of Fe,SiC,Si and O2. This reaction together with abrasive wear adhesive wear and fatigue wear, accelerate the wear of materials.%通过MM-1000Ⅱ摩擦试验机,研究了三维针刺C/SiC复合材料与30CrSiMoVA对偶的摩擦磨损性能,并结合SEM,XRD,EDS、热力学计算以及刹车过程温度场有限元模拟,分析了刹车过程中的摩擦磨损机理和物相转变.结果表明:随着初始刹车速率的增加,三维针刺C/SiC复合材料与30CrSiMoVA对偶刹车的平均摩擦系数减小,摩擦面温度升高,三维针刺C/SiC复合材料与30CrSiMoVA线磨损率呈增大趋势.初始刹车速率大于15m/s刹车时,摩擦面最高温度高于560℃,Fe与SiC,Si以及O2发生反应生成Fe3C,Fe3 Si,FeO,γ-Fe2 O3和α-Fe2O3,以上反应与磨粒磨损、粘着磨损以及疲劳磨损相互促进,加速了材料的磨损.