Alternators and drive motors are commonly used power equipment, and motor bearing grease is the key to ensuring stable and efficient operation of the motor. The main failure modes of motor bearings include fatigue, wear, plastic deformation, corrosion and electric corrosion, among which fatigue, wear, corrosion and burn are mainly related to the quality of grease, plastic deformation and cage damage are mainly related to bearing materials, and electric corrosion Mainly related to the shaft current. Galvanic corrosion is one of the factors that cause premature failure of bearings in alternators and drive motors. This is because the metal particles produced by galvanic corrosion lead to rough rolling surfaces and deterioration of lubricating grease, thereby increasing the vibration and noise of the bearings [1]. Aiming at the shaft current problem of rolling bearings, at this stage, it is mainly solved from two aspects of electrical conduction and electrical insulation: in terms of electrical conduction, the parameters of the insulating thin oil film are minimized, and the breakdown voltage is reduced by using conductive grease and conductive seals; The oil film parameters are maximized, and insulating materials are used to increase the breakdown voltage. The control of oil film parameters varies with lubricant, speed, temperature and load, which is difficult to control. If a conductive seal is selected, the seal ring will contact and wear with the inner or outer ring of the sports bearing, resulting in electrical conductivity failure, and the use of insulating materials has high requirements for processing accuracy and cost control. Therefore, under the premise of ensuring the grease leakage resistance and low conductivity decay rate, the application of conductive grease is the most simple and direct effective way to suppress the shaft current. Grease is defined as a solid or semi-fluid product in which a thickener is dispersed in a liquid lubricant, and other components (additives, fillers, etc.) can also be added to make it endowed with special properties [2]. Literature [3] studied the performance of carbon nanotube conductive silicone grease and graphene conductive silicone grease. When the addition amount is the same, carbon nanotubes can improve the dropping point, conductivity and tribological properties of silicone grease better than graphene. When When the contents of carbon nanotubes and graphene are both 0.2%, the prepared conductive silicone grease has better anti-wear and anti-friction properties. Literature [4] studied the preparation and performance of conductive composite lithium-based grease. The selected organic conductive medium not only reduces the volume resistance, but also improves its lubricating performance by forming a friction protective film. Literature [5] studied the conductivity and tribological properties of ionic liquids in greases, prepared conductive greases with ionic liquids as base oil and high-alkaline value complex calcium sulfonate as thickener, and investigated its volume resistance Conductivity such as rate and contact resistance. Literature [6] uses polyethylene oxide polypropylene oxide monobutyl ether (PAG) as the base oil, polytetrafluoroethylene as the thickener, and vapor-phase grown carbon fiber (VGCF), silver powder and copper powder as conductive fillers respectively. , prepared electric composite grease, and studied the tribological properties of vapor-grown carbon fibers as conductive fillers in grease. Literature [7] used carbon nanomaterials as conductive agents to prepare conductive grease for bearings, and evaluated its anti-corrosion performance through small-scale bearing energization and rotation tests. When current passes through the bearing with conductive grease, due to the formation of rolling contact The current path is reduced, the current density of the rolling contact part is reduced, and it is beneficial to suppress the electric corrosion of the bearing.  

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