C／C-SiC材料不同制动速率下的湿式摩擦磨损性能

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Carbon fibre reinforced carbon and silicon carbide dual matrix composites （C/C-SiC） were fabricated by the combination of chemical vapor infiltration （CVI） with liquid silicon infiltration （LSI）. The tribologieal behaviors of the C/C-SiC composite were investigated using an MM-1000 fric- tion and wear tester, at different braking speeds under dry and machine oil lubricating conditions. The results indicate that the contact angle between C/C-SiC and distilled water is about 80. 5%, which means the C/C-SiC are lipophilie materials. In the CD15W-40 diesel engine oil lubrication condition, with the brake speeds increasing from 3000r/min to 6000r/min, the coefficient of friction （COF） and linear wear of C/C-SiC reach the maximum value of 0.21/lm/cyele and 1. 1μm/cycle respectively, at 4000r/rain. When the brake speeds are 5000r/min and 6000r/min, the COF and the linear wear are 0. 17 and 0, respectively. C/C-SiC maintains a relatively high COF, smooth braking curves and lower wear rate in wet conditions, which can be used as candidate materials for wet eluteh of new generation of construetion machinery and heavy vehieles.以炭纤维针刺毡为预制体，先采用化学气相渗透法制备炭基体，然后采用熔融渗硅法制备SiC基体，得到C／C-SiC摩擦材料；利用MM-1000型惯性试验台研究了C／C-SiC材料在不同制动速度下干态和CDl5V-40柴油机油润滑状态下的摩擦磨损性能。研究结果表明：C／C-SiC摩擦材料与水的接触角为80．5。左右，为亲油性材料；C／C-SiC材料在CDl5W-40柴油机油润滑状态下，随制动速度从3000r／min升高到6000r／min，其摩擦因数和线性磨损量在4000r／min时达到最大值，分别是0．21μm／cycle和1．1μm／cycle，而在5000r／min和6000r／min时，其摩擦因数均为0．17，线性磨损量均为0；C／C-SiC摩擦材料在湿态条件下能保持较高的摩擦因数，制动曲线平稳，磨损率低，可作为新一代工程机械和重型车辆湿式离合器用摩擦材料的候选材料。