对等温CVD和热梯度CVD沉积所得不同结构的炭/炭复合材料, 不同刹车速度下的摩擦磨损性能进行了研究. 其中等温CVD所得的a、b材料分别是粗糙层结构和光滑层结构, 热梯度CVD沉积所得的c材料是前两者的混合结构. 摩擦试验在实验室规模的MM-1000摩擦试验机上进行. 试验表明:随着刹车速度的增大, a材料的摩擦系数随着速度的提高而不断上升, 在15m·s-1处达到峰值, 然后下降趋于一稳定值; b、c材料的曲线变化比较一致, 在20m·s-1处均出现峰值, 然后摩擦系数下降趋于一稳定值. 无论何种材料, 当摩擦系数峰值出现时, 距摩擦面1mm、外径3mm深处的温度均显示在250℃左右. 随着刹车速度的增加, 炭/炭复合材料的磨损加大, 但速度达30m·s-1时的氧化失重均<28m·s-1的氧化失重.
This paper described the tribological properties under different braking speeds of carbon/cabon composites whose microstructures are rough lamina, smooth lamina, mixture of rough lamina and smooth lamina respectively. Optical microscope and scanning electron microscope techniques were used to characterize the microstructures and the worn surfaces. The friction and wear properties of the composites were tested by using a laboratory dynamometer. Results indicate that the friction coefficients of the material a increase to the peak at 15m·s-1, while the friction coefficients of sample b and c increase to the peak at 20m·s-1. However, the same temperature of about 250℃ is showed under the worn surface 1mm when the friction coefficient increases to the peak. The weight loss increases with the increase of the braking speeds from 5m·s-1 to 30m·s-1, but the weight loss of 28m·s-1 is lower than that of 30m·s-1.
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