(中南大學(xué) 粉末冶金國家重點(diǎn)實(shí)驗(yàn)室，長沙 410083)
摘 要: 在MM−1000型摩擦試驗(yàn)機(jī)上，對C/C復(fù)合材料在不同相對濕度下進(jìn)行摩擦磨損性能實(shí)驗(yàn)，用掃描電子顯微鏡對其磨損表面形貌和磨屑進(jìn)行觀察分析。結(jié)果表明：隨著相對濕度的增加，C/C復(fù)合材料的摩擦因數(shù)降低，質(zhì)量磨損下降，且在高相對濕度下，由于水分的潤滑，摩擦因數(shù)要比在低相對濕度下的更穩(wěn)定，兩者剎車時(shí)間相近，可見在飛機(jī)著落實(shí)際環(huán)境下，短時(shí)間內(nèi)相對濕度高低對剎車性能影響不大。但長時(shí)間在高相對濕度下放置后，材料的摩擦磨損性能受到很大影響，表現(xiàn)為剎車時(shí)間比較長，摩擦因數(shù)和質(zhì)量磨損偏低。通過分析摩擦后的材料表面及磨屑形貌，發(fā)現(xiàn)隨著相對濕度的增加，主要磨損機(jī)理發(fā)生轉(zhuǎn)變，從低相對濕度下的氧化磨損轉(zhuǎn)變?yōu)楦呦鄬穸认碌膭儗幽p。
關(guān)鍵字: 炭/炭復(fù)合材料；相對濕度；摩擦；磨損性能
（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
