纤维种类对C/C复合材料摩擦磨损性能的影响

目的为了降低C/C复合材料制造成本,扩展C/C复合材料应用领域,选用低成本预氧丝纤维取代碳纤维,制备出C/C复合材料,并研究纤维种类对C/C复合材料摩擦磨损性能的影响。方法以两种纤维为原材料,采用CVI工艺制备出C/C复合材料,用MM-2000摩擦试验机进行摩擦磨损试验,采用扫描电镜对摩擦面进行形貌分析。结果随着载荷的增大,预氧丝基C/C复合材料在与金属摩擦时摩擦因数保持在0.22左右,平均磨损量为0.82 mg/min,而碳纤维基C/C复合材料与金属配副相对摩擦因数较小(0.15~0.20),平均磨损量为1.17 mg/min。三种碳与碳配副中,预氧丝基C/C复合材料同预氧丝基C/C复合材料配副之间的摩擦因数随载荷波动的范围为0.28~0.33,较稳定,平均磨损量为1.76mg/min。碳纤维基复合材料与碳纤维复合材料配副时,随着载荷的增大,摩擦因数变化范围较大(0.15~0.33),平均磨损量为2.35 mg/min。预氧丝基复合材料与碳纤维基复合材料之间相互配副,其磨损最大,平均磨损量为2.95 mg/min。结论 C/C复合材料的摩擦磨损性能与纤维种类有很大关系,采用预氧丝纤维制备出的C/C复合材料,无论与金属相互摩擦,还是与自身材料摩擦,均易形成较为稳定的润滑膜。随着载荷的增加,摩擦因数变化较小,磨损量和摩擦功也最低,表现出比碳纤维基C/C复合材料更优异的摩擦性能。

Effect of Fiber Type on the Friction and Wear Properties of C/ C Composites

Objective In order to reduce the manufacturing cost of C/ C composite materials, and expand the application field of C / C composite materials, two kinds of C / C composite materials were prepared, and the effect of fiber type on the friction and wear properties of C / C composites was studied. Methods Two kinds of C / C composite materials with two different kinds of fiber materials were prepared by CVI process. The friction and wear behaviors of the two materials in different friction pairs were studied using the MM-2000 friction test machine, and the morphology analysis of the friction surface was conducted using SEM. Results The results showed that:with the increase of load, the friction coefficient between pre oxygen basal C / C composites and metal remained at about 0. 22, with an average wear loss of 0. 82 mg / min; The carbon fiber basal C / C composites and metal had a relatively low coefficient of friction (0. 15 ~ 0. 20), and the friction coefficient changed with the load fluctuation because of the occurrence of abrasive wear behavior in the process. The average wear amount was 1. 17 mg / min. For a pair of C / C composites, the friction coefficient between pre oxygen basal C / C and pre oxygen basal C / C composites ranged 0. 28 ~ 0. 33, which was relatively stable, with an average wear of 1. 76 mg / min; With the increase of load, the friction coefficient of carbon fiber basal composite and carbon fiber composite varied in a relatively large range (0. 15 ~ 0. 33), besides the average amount of wear was 2. 35 mg / min; The wear between pre oxygen basal composite and carbon fiber basal composite was the biggest, with an average wear amount of 2. 95 mg / min. Conclusion The friction and wear properties of C / C composites were greatly related to the fiber type, and the C / C composites prepared by the pre oxygen fiber were easy to form a stable lubricating film. With the increase of load, the fluctuation range of the friction coefficient was relatively small, and the wear and friction work was also the lowest. The friction properties of carbon fiber based C / C composites were more excellent. The friction properties of pre oxygen basal C / C composites were superior to those of the carbon fiber based C / C composites.