(中南大学 粉末冶金国家重点实验室，长沙 410083)
摘 要: 在MM−1000型摩擦试验机上，对C/C复合材料在不同相对湿度下进行摩擦磨损性能实验，用扫描电子显微镜对其磨损表面形貌和磨屑进行观察分析。结果表明：随着相对湿度的增加，C/C复合材料的摩擦因数降低，质量磨损下降，且在高相对湿度下，由于水分的润滑，摩擦因数要比在低相对湿度下的更稳定，两者刹车时间相近，可见在飞机着落实际环境下，短时间内相对湿度高低对刹车性能影响不大。但长时间在高相对湿度下放置后，材料的摩擦磨损性能受到很大影响，表现为刹车时间比较长，摩擦因数和质量磨损偏低。通过分析摩擦后的材料表面及磨屑形貌，发现随着相对湿度的增加，主要磨损机理发生转变，从低相对湿度下的氧化磨损转变为高相对湿度下的剥层磨损。
关键字: 炭/炭复合材料；相对湿度；摩擦；磨损性能
（State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:The friction and wear properties of C/C composites were investigated under different relative humidities on the MM−1000 friction tester. The worn surface morphologies and the dust were observed with a scanning electron microscope. The results show that the friction coefficient and mass loss decrease with increasing relative humidity. Beside, under high relative humidity, because of the lubricating effect of water, the friction coefficient is stabler than that under low relative humidity, and the braking time is very close between them. So, in the actual environment, the level of relative humidity within a short time has little influence on the brakes. However, when the sample is placed in the high relative humidity environment for a long time, the friction and wear properties of materials are greatly affected, it shows long braking time, low friction coefficient and wear mass. By analyzing the worn surface morphologies of material and the debris, the main wear mechanism will be changed with increasing the relative humidity, transforming from oxidation wear under low relative humidity to delamination wear under high relative humidity.
Key words: C/C composites; relative humidity; friction; wear properties
