Preparation method of tungsten disulfide composite material for motor carbon brush

Abstract

The invention relates to a method for preparing a tungsten disulfide composite material for a motor carbon brush. The method comprises the steps of preparing silicon carbide and tungsten powder into a suspension liquid, controlling the pH value by adding a dispersant, adding rare earth catalyst and sulphur into a precursor solution prepared from urea and anhydrous alcohol, ultrasonically mixing, aging and then drying to obtain mixed powder; and preparing materials, performing high-temperature sintering reaction at the temperature of 230-850 DEG C under the protection of argon, subsequently grinding and classifying by using a vibration sieve to obtain the tungsten disulfide composite material for the motor carbon brush. The operation quality of the carbon brush made from the tungsten disulfide composite material for the motor carbon brush prepared according to the method is improved, the service life of the carbon brush and a commutator are prolonged, the generation of noise can be restrained, simultaneously a subsequent preparation technology of the carbon brush is simplified, and the preparation efficiency of the carbon brush is greatly improved.

Description

technical field [0001] The invention relates to a preparation method of a tungsten disulfide composite material for a motor carbon brush in the field of new materials. 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 be used not only in general lubrication conditions, but also in certain high temperature, low temperature, high load, high vacuum, In harsh working environments with radiation and corrosive media, it can be used alone in powder state, or mixed with lubricating oil, grease, graphite, metal powder, plastic and other materials to make composite materials. Tungsten disulfide composite material is a very good emerging energy-saving material for reducing friction. Its performance is much better than tr...

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