The difference between high purity graphite rod and impregnated graphite rod
High-purity graphite rods are made of high-density, high-strength, high-purity graphite. They are a little more wear-resistant than ordinary graphite, but only relatively wear-resistant. Some graphite products need to be on rotating equipment, so this requires super wear resistance. Since high-purity graphite will generate dust during repeated rotation and friction, the wear resistance of high-purity graphite products is not strong, and impregnated graphite can be used for super wear-resistant graphite products. Impregnated graphite can be impregnated with different substances according to the different requirements of the product on the stone. The common ones are resin impregnated graphite, antimony impregnated graphite, copper impregnated graphite, etc. Graphite impregnated is very wear resistant like epoxy impregnated graphite. Lubricant properties.
Resin-impregnated graphite rods are not only wear resistant but also add lubricity. Resin-impregnated graphite rods can be processed into many lubricating and wear-resistant graphite products. The processed graphite products are very smooth. If polished, they can achieve a mirror finish.
At present, the graphite used in oil-free self-lubricating bearings is mostly carbon arc gouging carbon rods. In fact, carbon arc gouging carbon rods have poor lubrication properties simply because they are made of graphite, which itself is a solid lubricant. But not all graphite is lubricated. Graphite lubrication depends on flake size. The larger the scale size, the better the lubrication effect. Due to its lubrication, oil-free bearings and self-lubricating copper guide bushes are wear-resistant.
Carbon arc gouging carbon rods are mainly used in auxiliary shipbuilding. It works by dissolving and blowing away bad welds and bevels. For example, when welding a weld, if there is a defect or quality problem, use a carbon rod to melt and blow the iron, why will it blow out? This is to generate high temperature in compressed air to melt the iron and blow away the molten iron. Shipyards are mainly used to repair welds. The models and specifications are all long, and the diameter is generally between 0.15 and 0.2, because the surface needs to be covered with a layer of metal, which is made into a negative tolerance. The carbon arc gouging carbon rod can be touched by hand, because the carbon The arc gouging carbon rod is extruded, its airtightness is very high, and the particle size is very soft, so it will fall off layer by layer.
The real lubricated graphite rod is easy to know, its specification is very standard, 3mm is 3mm, the tolerance is the same as our standard parts, generally around 0.02, because it is machined, not extruded, so the appearance is very smooth, not Will dust off just looking at it. Works great too. Everyone who makes mechanical hardware knows that the drill bit we drill is generally about 0.2 smaller than the standard hole. The carbon arc gouging carbon rod meets the standard specifications for the metal surface, so it is also a burden. Tolerance, for example, a 6.8 hole can hold a 6.8 graphite rod, but because the carbon rod of carbon arc gouging is relatively soft, it is easy to rub to reduce the size, so it is very loose. This is a problem encountered by many manufacturers of oil-free self-lubricating bearings and guide bushes.