摩擦特性的影響
(中南大學(xué) 粉末冶金國家重點實驗室，長沙 410083)
摘 要: 采用溶膠浸漬技術(shù)對4種C/C復(fù)合材料進行抗氧化處理。在M2000型摩擦實驗機上測試了4種C/C材料的摩擦特性。結(jié)果表明：在相同載荷下，光滑層CVI(SL)的C/C材料浸漬后試樣與未浸漬試樣的摩擦因數(shù)值最接近；樹脂炭(RC)的C/C材料中，浸漬后試樣的摩擦因數(shù)均低于未浸漬的試樣且相差最大；粗糙層CVI(RL)的C/C材料中，中高載荷下浸漬溶膠試樣的摩擦因數(shù)低于未浸漬溶膠的試樣；而具有粗糙層/光滑層/樹脂炭(RL/SL/RC)的C/C材料中，中高載荷下浸漬溶膠后試樣的摩擦因數(shù)變化比未浸漬試樣的高。隨載荷增加，SL炭材料未浸漬和已浸漬試樣摩擦因數(shù)的變化幅度均最低，RC炭材料未浸漬試樣和已浸漬試樣的摩擦因數(shù)變化幅度最大，RL/SL/RC、RL結(jié)構(gòu)的試樣是否浸漬溶膠對其摩擦因數(shù)的影響無明顯規(guī)律。石墨化度高的材料的摩擦行為受浸漬溶膠的影響高于石墨化度低的材料。
關(guān)鍵字: C/C復(fù)合材料；抗氧化涂層；溶膠浸漬；摩擦
coating on sliding friction characteristics
of C/C composite
（State Key Laboratory of Powder Metallurgy, Central South University,
Changsha 410083, China）
Abstract:Four kinds of C/C composites were impregnated in a sol-gel anti-oxidation precursor. On M2000 wear tester, the influence of the sol-impregnation treatment on the sliding tribology behavior of C/C was studied compared with the samples without impregnation treatment. The results show that under the same load, among the samples with smooth lamination structure matrix carbon (SL), the friction coefficients of samples with sol-impregnation treatment have similar value to those of the samples without treatment; among the samples with resin carbon (RC), the friction coefficients of samples with treatment are lower than those of the samples without treatment; the friction coefficients of the samples with rough lamination matrix carbon (RL) with treatment are lower than those of the samples without treatment under middle and high loads; but the friction coefficients of samples with RL/SL/RC with treatment are higher than those of the samples without treatment under middle and high loads. With the increase of loads, the SL samples with or without treatment have the lowest change extent in the friction coefficient, those of the RC samples have the highest change extent. But for the RL or RL/SL/RC samples with or without the treatment, the friction coefficients have not shown such notable change rule. As a complete unit, the effect of sol-impregnation treatment on the sliding behavior of composite with high graphitization is higher than that of the composite with low graphitization.
Key words: C/C composites; anti-oxidation coating; sol-impregnation; friction
