CVD碳粉含量对铜基粉末冶金离合器材料性能的影响

Effect of CVD carbon content on the properties of copper-based powder metallurgy clutch material

以化学气相沉积(CVD)法制备的C/C复合材料切削碎屑作为碳粉来源,采用粉末冶金方法制备不同碳粉质量分数的铜基粉末冶金摩擦材料,利用扫描电镜(SEM)和能谱分析仪(EDS)分析材料摩擦表面的微观结构和成分,并研究该材料的力学性能和摩擦磨损性能。研究结果表明:CVD碳粉-铜基粉末冶金材料的布氏硬度、密度、抗压强度均随化学气相沉积碳粉含量的增大而减小,开孔隙率随碳粉含量的增加而增大;CVD碳粉为光滑层热解炭,CVD碳粉质量分数为1%～2%的CVD碳粉-铜基粉末冶金样品的主要磨损机理为磨粒磨损,质量分数为3%～5%的CVD碳粉-铜基粉末冶金样品的磨损机理为磨粒磨损和剥层磨损共同作用。

The cutting debris of C/C composites prepared by chemical vapor deposition(CVD)was used as the source of carbon powder.Chemical vapor deposition(CVD)carbon powder/copper-based powder metallurgy friction materials with different CVD carbon powder contents were prepared by powder metallurgy method.The microstructure and composition of the friction surface of the materials were analyzed by scanning electron microscope(SEM)and energy dispersive spectrometer(EDS).The mechanical properties,friction and wear properties were also studied.The results show that the brinell hardness,density and compressive strength of CVD carbon powder/copper-based powder metallurgy materials decrease and the open porosity increases respectively with increasing the content of CVD carbon powder.The CVD carbon powder is smooth layer pyrolytic carbon.The main wear mechanism of 1%-2%CVD carbon powder/copper-based powder metallurgy materials is abrasive wear,and the main wear mechanism of 3%-5%CVD carbon powder/copper-based powder metallurgy materials samples is mixture of abrasive and delamination wear.