Metallized Carbon Corporation (Ossining, NY) has announced 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 carbongraphite material 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.
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