Compression strength ranges from 15,000 psi to 25,000 psi, depending on the grade of graphite and the metal. Their load capacity makes them suitable for hot material handling devices, furnace conveyors and cart wheels.

Eliminating lubricants from a bearing eliminates the associated environmental limitations. For more than 75 years, graphite-metal compounds have been used in conventional bearings that must operate in extreme environments. Graphite is one of the earliest materials to be recognized as a solid lubricant, and continues to be used on applications that are too hot -- above 500F -- for other solid lubricants, such as PTFE or molybdenum disulfide. Graphite derives its low friction characteristics (0.15 to 0.30 coefficient of friction on cold-rolled steel) from its planar structure; the individual plates tend to slip over each other.

Single row radial bearings are designed primarily to support a radial load, they perform relatively well under thrust or combined radial and thrust load.

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Vibration-prone applications, such as pumps with mechanical seals, can benefit from these bearings because their running clearances can be smaller than for alternate bearing materials. These bearings have a coefficient of thermal expansion that is about half that of steel, so shaft clearances are typically in the range of 0.008 to 0.012 in., a dimension that's less than one-third of that required for metallic parts. In fluid handling systems, tight clearances reduce leakage and increase efficiency.

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Graphite-metal alloy bearings are more tolerant of foreign particles than are lubricated bearings. Because they use no oil or grease, graphite-metal bearings don't attract or hold grit, so they are often used in kilns and agitators, where dust is present. Table 1 shows some typical families of applications. Table 2 shows when to use graphite-metal bearings. Eben Walker is general manager for Graphite Metallizing Corp. in Yonkers, N.Y. You can reach him at (914) 968-8400.

Lubrication issues limit the performance of conventional journal, rolling-element and self-lubricating (oil impregnated) bearings. Most bearings don't provide satisfactory life in applications that are hostile to lubricants. Extreme temperatures, grit, vibration, prolonged idle time, corrosives and large loads degrade bearing lubrication. Without the protection a lubricant provides, the bearing suffers metal-to-metal contact, with sudden failure not far behind.

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Low temperatures are inhospitable to bearing lubricants, too. It causes them to solidify, which degrades their ability to flow between bearing surfaces.

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Speeds and loads can be determined by conventional PV limits (P is the bearing load in psi and V is the shaft speed in feet per minute). For dry-running conditions, PV is nominally 12,000. However, for applications that are submerged in process fluids, PV can be increased by a factor of seven to 10. Certain combinations of loads and speeds can exceed standard limitations. Some bushings have operated at 60,000 rpm when submerged and 200,000 rpm when gas lubricated. Load can be as high as 1,000 psi, depending on the speed and operating condition.

What often goes unrecognized is that, to a degree, vibration is inevitable in rotating system design. Because conventional metallic bearings and bushings must operate with sufficient clearance to accommodate thermal expansion, there is some play between mating parts.