(中南大學(xué) 粉末冶金國(guó)家重點(diǎn)實(shí)驗(yàn)室，長(zhǎng)沙 410083)
摘 要: 制備了兩種具有不同基體炭類(lèi)型的C/C復(fù)合材料，測(cè)試其與GCr鋼在40 N時(shí)配副時(shí)的往復(fù)式摩擦行為。結(jié)果表明：隨滑動(dòng)頻率的增加，兩種試樣的摩擦因數(shù)先增加，均在400 r/min時(shí)達(dá)到最大，之后除在1 200 r/min時(shí)略有反彈外，基本表現(xiàn)出線(xiàn)性下降趨勢(shì)。在相同頻率下，具有光滑層結(jié)構(gòu)熱解炭基體材料(SL)的摩擦因數(shù)低于另一種具有粗糙層結(jié)構(gòu)熱解炭和樹(shù)脂炭混合基體(RL/RC)材料的。其中，RL/RC基體材料的摩擦因數(shù)在0.183~0.063之間；而SL基體材料的摩擦因數(shù)在0.150~0.059之間。隨時(shí)間的延長(zhǎng)，所有試樣的摩擦因數(shù)均逐漸趨于穩(wěn)定。Raman檢測(cè)結(jié)果表明，隨滑動(dòng)頻率增大，材料摩擦表面的微區(qū)石墨化度增加。但SEM形貌表明，隨滑動(dòng)頻率增大，材料摩擦表面形貌由光滑變得粗糙，磨粒磨損加劇。
關(guān)鍵字: C/C復(fù)合材料；往復(fù)式摩擦；頻率；摩擦特性
different frequencies
（State Key Laboratory for Powder Metallurgy, Central South University, Changsha 410083, China）
Abstract:The influence of reciprocating frequency on the sliding friction behavior of two kinds of C/C composites against GCr steel ball was investigated on a UMT−3 tester at 40 N. The results show that the coefficient of friction (COF) of the two C/C composites increases firstly with increasing the sliding frequency until it reaches the maximum at 400 r/min, and then the COF shows a similar linear decline except some fluctuation generated under 1 200 r/min. The COF of the composites with rough lamination pyrocarbon/resin carbon matrix (RL/RC) is larger than that of the composites with smooth lamination pyrocarbon (SL) matrix at the same sliding frequency. The COFs of the RL/RC-composites are in the range of 0.183−0.063, while those of the SL-composites are 0.150−0.059. The COFs of all the samples become more and more stable with increasing time. The results of Raman spectrum detection show that the graphitization of micro-worn-area composites with SL increases with increasing the reciprocating frequency. SEM images show that the worn surfaces of the two C/C composites change from smooth surface to rough surface with more plough-worn grooves.
Key words: C/C composites; reciprocating friction; frequency; frictional property
