Tungsten disulfide composite material for motor carbon brush and preparation method thereof

Abstract

The invention relates to a tungsten disulfide composite material for a carbon brush of a motor and a preparation method thereof. The tungsten disulfide composite material comprises the following components in percentage by mass: 1% of tungsten, 0.3488% of sulfur, 0.005-0.3% of silicon carbide and 0.0005-0.005% of a rare earth catalyst, wherein the rare earth catalyst is selected from one or more of the Re, Pt, Rh, Ta and Co or the sulfide of the Re, Pt, Rh, Ta and Co. The preparation method of the tungsten disulfide composite material comprises the following steps of: proportioning the components, carrying out high-temperature sintering reaction at the temperature of 230-850 DEG C under the protection of argon, grinding the product of reaction, and grading by using a vibrating screen to obtain the tungsten disulfide composite material. The carbon brush produced from the tungsten disulfide composite material has high operating quality and long service life, so that the service life of a commutator can be prolonged, and noises can be inhibited. In addition, the subsequent preparation process of the carbon brush can be simplified, and the preparation efficiency of the carbon brush can be improved greatly.

Description

technical field [0001] The invention relates to a tungsten disulfide composite material for electric carbon in the field of new materials and a preparation method thereof. Background technique [0002] As a new technology, composite materials have the characteristics of saving costs, improving product performance, and improving efficiency. Tungsten disulfide is an important friction material. Its physical and chemical properties and the results of its application tests show that it can not only be used in general lubrication conditions, but also in certain high temperature, low temperature, high load, high vacuum, In harsh working environments such as radiation and corrosive media, it can be used alone in powder form, or it can be mixed with lubricating oil, grease, graphite, metal powder, plastic and other materials to make composite materials. Tungsten disulfide composite material is a very good new wear-reducing and energy-saving material. Its performance is much better ...

AI Technical Summary

Problems solved by technology

If the carbon brush works for a long time, a thick carbon film will be formed on the surface of the commutator. If the carbon film is partially peeled off, a large current will be generated in the peeled part, and then an electric spark will be generated, which will generate a carbon brush on the surface of the carbon brush. Uneven, if the current is too large, it will also cause damage to the surface of the commutator

Therefore, it is necessary to add abrasives such as silicon carbide powder to the carbon brush, so that the carbon film formed on the surface of the commutator when the carbon brush is working can be removed by silicon carbide. However, due to the high hardness of silicon carbide powder, it is often If the particles are too large or flocculated, the dispersion will be uneven. As the carbon brush slides for a long time, the surface of the commutator will be ground, which will damage the surface of the commutator, thereby reducing the working efficiency of the motor and causing noise

Moreover, in the production process of carbon brushes, the carbon brush raw materials such as solid lubricant tungsten disulfide and abrasive silicon carbide and graphite are generally mixed directly, but the solid lubricant tungsten disulfide and abrasive silicon carbide are often mixed due to inaccurate mixing. Even, when the carbon brush is working, the carbon film formed by the solid lubricant on the surface of the commutator cannot be eliminated stably and uniformly by the grinding agent, causing the surface of the commutator to be uneven, resulting in excessive local current, affecting the carbon brush and commutator life, causing the motor to work unstable