材料期刊网

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1.76 mg/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。

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 materi-als 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 re-sults 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 coef-ficient 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 av-erage 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 be-tween 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 pre-pared by the pre oxygen fiber were easy to form a stable lubricating film. With the increase of load, the fluctuation range of the fric-tion 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 car-bon fiber based C/C composites.