Solid Lubricants and Self-Lubricating Solids by Francis J. Clauss

By Francis J. Clauss

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4. J. Gfaensheimer, Lubrication by solids. Int. Lubric. Seminar, Lucerne, September 1969. 5. E. W. Bielak, E. Kay, and E. W. Mardles, Lubrication by films of solid materials, Tech. Note Chem. 1271, Roy. Aircraft Estab. Great Britain, 1955. 5a. E. R. Braithwaite and J. Hickman, Dry-film lubrication of metals. Metal Ind. 104 (6), 190-192 (1964). 6. E. P. Kingsbury, Solid film lubrication at high temperatures. Trans. ASLE 1, 121— 123 (1958). 7. G. Kitchen and H. T . Azzam, Realistic friction testing.

Nevertheless, the four-ball tester gives a good indication of the load-carrying capacity of lubricants, and it is widely used. The Alpha LFW-l tester (Figure 3) and the Timken tester are among the most widely used testers for solid! lubricants. Both testers use a single stationary block loaded against a rotating ring. Tests are normally performed under single-line contact, although a conforming block may also be used for area contact. The major difference between the two testers is in the loading system.

Seeley [1] compares the layers to "chicken wire," where each junction of wires represents a carbon atom: Each carbon atom joins to three neighboring carbon atoms at 120° angles in the plane of the layer. 456 A. The joined atoms between layers are pinned by weaker van der Waals forces, thus accounting, in part, for the marked anisotropic properties of the graphite crystal. 3538 A apart (d spacing) at room temperatures. T h e most common stacking is the AB AB AB · · · order resulting in hexagonal structure [Figure l a ] .

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