High-lubricity high-hardness copper-based graphite motor carbon brush and manufacturing method thereof

Abstract

The invention discloses a high-lubricity high-hardness copper-based graphite motor carbon brush. A carbon brush material contains carbon monofluoride powder, so that self-lubricity of a composite material is greatly improved, and friction abradability of the material is reduced; meanwhile, a polydopamine film layer is deposited on the surface of the carbon material, so that combination degree between the carbon material and other raw materials is improved, and material hardness is higher; and composite silica sol containing carbon nano microspheres is taken as a binder, so that the carbon brush has good binding power, is free of residual carbon after being subjected to sintering treatment, is free of bad influence on system, and has good electrical conductivity; and the added titanium element can react with carbon to generate titanium carbide crystals with high hardness and high wear resistance, so that conductivity is not affected while material strength is improved.

Description

technical field [0001] The invention relates to the technical field of graphite carbon brush materials, in particular to a copper-based graphite motor carbon brush with high lubricity and high hardness and a preparation method thereof. Background technique [0002] Carbon brush is a type of friction device that transmits energy or signals between the fixed part and the rotating part of the motor. It is an important component of the motor and is a mixture of graphite and adhesive. Because its main component is carbon, it is called carbon. brush. As a sliding contact body that leads and imports current, carbon brushes are required to have good electrical conductivity, thermal conductivity, and lubricating properties, as well as certain mechanical strength and commutation spark resistance. With the development of science and technology, the types of motors and the used The working conditions are becoming more and more diverse, and the requirements for the comprehensive perform...

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Problems solved by technology

The article "The Effect of Pb and Sn Addition on the Microstructure and Performance of High Copper Carbon Brushes" introduces the influence of Pb and Sn alloying elements on the performance of copper-containing carbon brushes. The results show that the alloying elements have a certain degree of hardness and toughness on the material. However, the performance in conductivity and wear resistance is poor, the overall coordination of material properties is weak, and the use effect is not good; there are research reports that the addition of nanomaterials can improve the wear resistance of carbon brushes to a certain extent. For example, the article "Preparation and Performance Research of Carbon Nanotube Reinforced Resin / Graphite Carbon Brush" introduces carbon nanotubes as a modifier, which effectively reduces the friction coefficient of the material and has good wear resistance, but the epoxy resin bonding The carbonized particles formed by the heating of the agent are easy to fall off during the friction process, resulting in defects on the surface, accelerated wear, and poor performance of the carbon brush after working for a long time