制备工艺对C／C-SiC复合材料滑动摩擦特性的影响  

Influence of fabrication of SiC on tribological behavior of C/C-SiC composite against 40Cr steel

作　　者：葛毅成[1] 易茂中[1] 彭可[1] 杨芸芸[1] 

机构地区：[1]f中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《中国有色金属学报》2008年第11期2008-2013,共6页The Chinese Journal of Nonferrous Metals

基　　金：国家重大基础研究发展计划资助项目(2006CB600906)

摘　　要：分别采用熔渗硅(MSI)、前驱体裂解(PIP)技术制备4种C/C-SiC复合材料。在M2000型实验机上测试材料的摩擦磨损特性。结果表明:采用MSI制备的2种C/C-SiC摩擦因数高、不稳定,摩擦因数在0.404～0.906之间波动;随载荷增加,MSI-SiC质量分数为40.9%的材料B的摩擦因数变化幅度低于SiC质量分数18.9%的材料A的摩擦因数,但其随时间延长的波动幅度大;随时间延长和载荷增加,采用PIP制备的2种C/C-SiC材料的摩擦因数变化小,在0.08～0.14之间波动;其中,随载荷增加,PIP-SiC质量分数为18.0%的材料C的摩擦因数波动幅度稍大于SiC质量分数为6.0%的材料D的。EDAX分析表明:材料A的部分磨损表面未发现碳元素;而材料C磨损表面的碳硅摩尔比大于1,使其有足够的炭形成自润滑膜,从而降低材料的摩擦因数。SEM形貌表明:MSI技术制备的材料摩擦表面粗糙,未形成完整的摩擦膜,而采用PIP技术制备的材料摩擦表面较完整且致密。Four C/C-SiC composites were prepared using molten-Si infiltration-reaction（MSI） or precursorpyrolysis（PIP）, respectively. The sliding tribological behaviors of these four composites and one C/C composite were tested by M2000 wear tester. The results show that the coefficients of friction （COF） of the two kinds of MSI-composites are high under the applied loads and time, which fluctuate in 0.404-0.906. With increasing loads the COF of composite B with 40.9% （mass fraction） MSI-SiC has lower fluctuation than those of composite A with 18.9% MSI-SiC. But with prolonging time, the COF of composites A has larger changing extent than those of composite B except that under 150N. For the two PIP-composites, the COF are low and stable, which fluctuate in 0.08-0.144. But with increasing load, composite C with 18.0% PIP-SiC has a little larger changing extent than composite D with 6.0% PIP-SiC. The EDAX results show that the carbon element has not been found on part of the worn surface of composite B. The molar ratio of carbon to silicon on the worn surface of composite C is higher than 1, which indicates that carbon friction film can easily form with good lubrication to decrease the COF. SEM images of the MSI-composites have very rough friction films while the PIP-composites have smooth and integrated ones.

关 键 词：C/C—SiC复合材料 制备工艺 滑动摩擦 摩擦特性 

分 类 号：TB332[一般工业技术—材料科学与工程] TH145.1[机械工程—机械制造及自动化]