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In an oxidative atmosphere, graphite is effective at high temperatures up to 450 °C continuously and can withstand much higher temperature peaks. Graphite is characterized by two main groups: natural and synthetic. Synthetic graphite is a high temperature sintered product and is characterized by its high purity of carbon (99.5−99.9% ...
Grease fitting on a bearing A grease nipple on the driver's door of a 1956 VW Beetle. A grease fitting, grease nipple, Zerk fitting, grease zerk, or Alemite fitting is a metal fitting used in mechanical systems to feed lubricants, usually lubricating grease, into a bearing under moderate to high pressure using a grease gun.
Lithium-based grease has a dropping point at 190 to 220 °C (374 to 428 °F). However the maximum usable temperature for lithium-based grease is 120 °C. The amount of grease in a sample can be determined in a laboratory by extraction with a solvent followed by e.g. gravimetric determination. [6]
Assume a wagon rolling on a flat surface with four wheels, each equipped with sleeve bearings (not a permanently lubricated or a roller or ball bearing). Grease must be applied between the axle sleeve bearing continuously or periodically to prevent galling of the bearing / axle, depending on factors relating to heat produced by friction.
In normal operation, a rolling-element bearing has the rollers and races separated by a thin layer of lubricant such as grease or oil. [6] [7] [8] Although these lubricants normally appear liquid (not solid), under high pressure they act as solids and keep the bearing and race from touching. [9] [10]
A jewel bearing is a plain bearing in which a metal spindle turns in a jewel-lined pivot hole. The hole is typically shaped like a torus and is slightly larger than the shaft diameter. The jewels are typically made from the mineral corundum , usually either synthetic sapphire or synthetic ruby .
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