Carbon-Graphite Bushings For Aircraft Engine Fuel Pumps

Metcar carbon-graphite bushings are preferred for this application because they can use aviation fuel as the bushing lubricant, says the company.

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Ossining, NY - Metallized Carbon Corporation announces Metcar® carbon- graphite bushings for use in gear pumps that pump aviation fuel for aircraft engines. The carbon-graphite bushings are used to support both the drive gear shaft and the idler gear shaft. Metcar carbon-graphite bushings are preferred for this application because they can use aviation fuel as the bushing lubricant. Aviation fuel is a low viscosity liquid that produces only an extremely thin hydrodynamic film, too thin to provide adequate lubrication for traditional metallic bushings. But since Metcar’s carbon-graphite material -- in contrast -- has no atomic attraction to a metallic shaft, the thin fuel film is sufficient to lubricate metallic shafts running in the carbon-graphite bushings. A second major advantage of carbon-graphite bushings is that they are self-lubricating -- they can run dry for short periods of time without catastrophic pump failure or significant wear. In addition, Metcar carbon-graphite bushings are dimensionally stable, which permits the close bushing to shaft running clearances that are required in gear pump applications.

For more information, please visit www.metcar.com.

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