Modern mechanical carbon materials are being used in a wide variety of applications — a few examples include aircraft gearboxes, air turbine motor starters, and main shaft seals for both aircraft turbine engines and aircraft auxiliary power units (APUs).
These unique, self-lubricating materials are composed of fine-grained, electrographite substances that are impregnated with proprietary inorganic chemicals to improve lubricating qualities and oxidation resistance. These materials are ideal for use in aircraft applications because of their low coefficient of friction, low wear rate at high sliding speed, high thermal conductivity, and resistance to oxidation in high temperature air.
Engine manufacturers and operators, who are constantly working to extend their time between overall (TBO), are using these modern seal materials in seal designs. Their goal is to ensure that carbon main shaft seals will no longer be a factor in limiting time between overhaul (TBO) on new aircraft turbine engines.
These properties also make the materials of interest to designers of other high-speed, rotating equipment, for example high-speed rotary gas compressors and steam turbines.
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