Lanthanum-oxide-doped modified copper-based graphite motor carbon brush and preparation method thereof

Abstract

The invention discloses a lanthanum-oxide-doped modified copper-based graphite motor carbon brush. The base material of the carbon brush includes natural flake graphite, porous carbon powder and copper powder, and bronze powder compound, and lanthanum oxide is added for modification so as to improve the sintering performance. In the preparation process, polydopamine is deposited on the surface of natural flake graphite and porous carbon for surface modification in order to improve the bonding force between the carbon material and other raw materials and improve the density of materials. Conductive silica sol mixed with carbon nano microspheres is used to replace the traditional resin adhesive in order to prevent particles from falling off and being worn. The finally prepared carbon brush material exhibits good electrical performance and friction performance, is of high hardness and good sliding performance, is not easy to crack, and has outstanding comprehensive performance.

Description

technical field [0001] The invention relates to the technical field of graphite carbon brushes, in particular to a lanthanum oxide-doped modified copper-based graphite motor carbon brush 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 performance of carbon ...

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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