Electrical contactors can be used in power devices, such as relays, sliding wire rheostats and other mechanisms with poor precision. Dry contactors oxidize and vulcanize rapidly. The generation of millivolt arcs (sparks) between the contactors promotes the formation of nitrogen oxides, corrosives such as HNO3. The presence of suitable grease can reduce the contact resistance, prevent sparks when the contactor is de-energized, protect the contactor from corrosive agents (water, oxygen, nitrogen, etc.), and reduce the impact of the contactor when it is energized.

   The grease layer on the contactor should not be applied too thick, as excess grease will be pressed out of the contactor. A particularly thin layer of grease should be applied to relays with poor accuracy, too little grease may be thrown off quickly. Therefore, in order to maintain a certain amount of grease, the roughness of the contact surface should be appropriately increased. Grease-petroleum ether solution is used, and a thin layer can be easily formed after the petroleum ether is volatilized. Thin layers can also be applied using an aerogel sprayer.

   Sparks in the contactor may have special effects on the grease (special grease manufacturer Shenzhen Hecheng), such as drying, oxidation, and even carbonization. These will destroy the normal operation of the contactor, therefore, require the application of stable grease. The grease must maintain its ability to work within the required temperature range: the grease should not run off the surface at high temperatures, and the movement of the moving parts of the contactor should not be affected at low temperatures. The speed of the contactor is generally not fast and does not affect the choice of lubricant. High specific loads in bitter contactors require the use of extreme pressure grease.

   The thin layers of oil and grease are capable of passing electricity, although they are good insulators as a whole. Unfortunately, both lubricating oils and greases oxidize and burn relatively easily. When the lubricating oil gels, the temperature of the contactor rises.

   Silicone oil has good chemical stability, but under the action of micro-discharge and flash fire, it is easy to decompose the surface to release silicon oxide, which destroys the normal operation of the contactor. According to foreign sources, it is recommended to use halogenated hydrocarbon liquids for electrical contactors first, followed by mineral oil and other hydrocarbon oils, fatty acids and their langous oils, and finally silicone oil (special lubricating grease manufacturer Shenzhen Hecheng). Grease is commonly made of silicone oil. The conductivity of polyoxyalkylene and its derivatives is 2-3 times greater than that of mineral oil, diester and silicone oil, and it has good drowning properties and no solid particles when decomposed. Therefore, it can be foreseen that it is promising to use polyoxyolefins and their greases in sliding electrical contacts.

   Soap-based grease is more conductive than lubricating oil, and the soap concentration is greater than 20%, and the resistance increases.

   The specific resistance of the best samples of soap based grease is about 10 ohm·cm. In order to improve electrical conductivity, silver powder, tungsten powder, pickaxe powder, copper powder and their alloys are added to the grease. Metal powders for making contact sheets are also sometimes added. The anti-wear and other properties of the grease are improved when polytetrafluoroethylene-zinc oxide and other substances are added. The US patent reports that the grease used for electrical contacts is made of mineral oil thickened with 8% barium stearate and 2% aluminum stearate with a viscosity of 60 centitorges at 37.8°C, and contains 10% anti-tear. Cracking additives - polychlorinated biphenyls, o. 1 (Special lubricating grease manufacturer Shenzhen Hecheng)% antioxidant 4,4 "-bis(dimethylamino)diphenylmethane and o.2% sorbitol monooleic acid. This grease can be used in Contact pieces made of shackles, silver, copper and their alloys. Another grease is 20% polytetrafluoroethylene (particle size 10 microns) thickened with methyl silicone oil and 40% zinc oxide (particle size o. 3 microns). For contact pieces made of gold, the best results are to use paraffin, polyphenylene ether and their mixtures, or halogenated hydrocarbon-based greases. Graphite powder (particle size 30-40 microns) is removed on the gold-coated contact pieces. ), the service life of the contact piece can be increased by 79 times, but the graphite powder should not be excessive, otherwise the contact resistance will be affected. For gold and gold-copper contact pieces, as well as electrical joints, it is recommended to use octadecylamino-supported chloride. Good The result is a mineral oil of 5% di-n-butyl tin sulfide, which can form lead oxide and lead sulfide films on the surface of gold to prevent sparks. For silver-plated contact pieces, light-based grease and polystyrene can be used. The ether-wax mixture prevents silver from turning black.