水热共沉积-碳热还原反应法制备的C/C-CuNi复合材料微观结构及性能

Microstructure and properties of C/C-CuNi composites prepared by hydrothermal co-deposition and carbothermal reduction reaction process

以葡萄糖为碳源,硝酸镍为镍源,硫酸铜为铜源,采用水热共沉积-碳热还原法制备了C/C-CuNi复合材料。由于水热过程中碳、NiO和CuO的共沉积,CuNi合金均匀分散在复合材料中。Ni的加入不仅提高了碳基体的石墨化程度,而且增强了纤维/基体界面的结合。分散在碳基体中的CuNi合金能有效提高材料的耐磨性。当Ni/Cu摩尔比为0.6时,复合材料表现出优异的性能。它具有高弯曲强度(92.4 MPa)和低电阻率(10.78μΩ·m)。在10 N载荷下,摩擦系数稳定在0.223,磨损率仅为0.45 g/h。其优异的摩擦学性能来源于微层裂疲劳磨损和镍加入形成的自润滑膜。这一简单易行的策略有望为高耐磨性的C/C-CuNi复合材料的设计和制备提供启示。

In this paper,using glucose as carbon source,nickel nitrate as nickel source and copper sulfate as copper source,C/C-CuNi composites were prepared by hydrothermal co-deposition and carbothermal reduction method.The CuNi alloy was uniformly dispersed in the composites due to co-deposition of carbon,NiO,and CuO in the hydrothermal process.The Ni addition not only im-proves the graphitization degree of the carbon matrix,but also enhances the bonding of fiber/matrix interface.The CuNi alloy dispers-ed in carbon matrix can effectively improve the wear resistance of the materials.The composites present outstanding properties when the Ni/Cu molar ratio is 0.6,which possesses high flexural strength(92.4 MPa)and low electrical resistivity(10.78μΩ·m).The friction coefficient is maintained at 0.223 and wear rate is just 0.45 g/h under 10 N applied load.The outstanding tribological per-formance comes from the micro-spall fatigue wear and the formation of self-lubricating film owing to the Ni addition.This simple and feasible strategy is expected to provide reference for the design and preparation of C/C-CuNi composites with high wear resistance.