摩擦特性的影响
(中南大学 粉末冶金国家重点实验室，长沙 410083)
摘 要: 采用溶胶浸渍技术对4种C/C复合材料进行抗氧化处理。在M2000型摩擦实验机上测试了4种C/C材料的摩擦特性。结果表明：在相同载荷下，光滑层CVI(SL)的C/C材料浸渍后试样与未浸渍试样的摩擦因数值最接近；树脂炭(RC)的C/C材料中，浸渍后试样的摩擦因数均低于未浸渍的试样且相差最大；粗糙层CVI(RL)的C/C材料中，中高载荷下浸渍溶胶试样的摩擦因数低于未浸渍溶胶的试样；而具有粗糙层/光滑层/树脂炭(RL/SL/RC)的C/C材料中，中高载荷下浸渍溶胶后试样的摩擦因数变化比未浸渍试样的高。随载荷增加，SL炭材料未浸渍和已浸渍试样摩擦因数的变化幅度均最低，RC炭材料未浸渍试样和已浸渍试样的摩擦因数变化幅度最大，RL/SL/RC、RL结构的试样是否浸渍溶胶对其摩擦因数的影响无明显规律。石墨化度高的材料的摩擦行为受浸渍溶胶的影响高于石墨化度低的材料。
关键字: C/C复合材料；抗氧化涂层；溶胶浸渍；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
