石墨化度对2.5D碳/碳复合材料在低能条件下的摩擦学性能影响

在MM-200型摩擦磨损实验机上,对2.5D编织结构的不同石墨化度的碳/碳(C/C)复合材料进行低能条件下的摩擦磨损实验,用扫描电子显微镜对其磨损表面形貌进行了观察分析.结果表明:石墨化温度升高到一定值之后,可使摩擦系数下降,而试样的摩擦系数不稳定,相应磨损量也会增大.在摩擦初始时,摩擦系数呈现交错变化,随时间的推移,摩擦系数出现分化,石墨化度高的试样摩擦系数较低,当石墨化度增加50%时,磨损率增加0.05%,磨损量变化不是很大.石墨化程度以及石墨化的均匀程度都对材料的摩擦磨损性能有很大影响.

Effect of Graphitization Degree on 2.5D C/C Composite's Tribological Properties on Low Energy

The tribological properties of C/C composites of different graphitization which weaved in 2.5D composites have been studied on MM-200 tribological machine, and the microstructure of the friction surface was observed. The experiments showed that the coefficient of friction has been decreased when the graphitization temperature improved to definite temperature, but the abrasion has improved at the same time. At the beginning, the coefficient of friction changed intervein. But when the test persisted, results show that the composites in higher graphitization degree has lower friction coefficient , but it's friction coefficient is unstable. The tribological rate changed slightly when the graphitization degree changed. The result indicated that when the graghization degree increased 50%, the wear rate increased (0.05%). According to the result, the instability of the frictional process increase acceleratively with the increases of the graphitization and uniform degree.