Surface-modified potassium titanate whisker-reinforced copper-based graphite motor carbon brush and preparation method thereof

Abstract

The invention discloses a surface-modified potassium titanate whisker-reinforced copper-based graphite motor carbon brush. According to the carbon brush material, natural flake graphite and flaky silver-plated copper powder are taken as base materials, and a polydopamine film is deposited on the surface of the natural flake graphite, so that the surface property is improved, the bondability and the dispersity of the polydopamine film and the other raw materials are improved and the sintered density of a green body is improved. The added potassium titanate whisker subjected to carbon nano-microsphere-polydopamine film coating treatment has good conductivity and enhancement effect; a traditional resin adhesive is replaced with silica sol, so that internal nodules of a system are effectively prevented from falling off in the sintering process; the finally prepared carbon brush material has more excellent mechanical property and anti-wear property than a traditional copper-based graphite carbon brush, and is durable in use, not easy to oxide and discolor and outstanding in performance.

Description

technical field [0001] The invention relates to the technical field of graphite carbon brushes, in particular to a surface-modified potassium titanate whisker-reinforced 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 comprehensiv...

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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