CRC Handbook of Lubrication: Theory and Practice of by Robert W. Bruce

By Robert W. Bruce

This guide covers the final sector of lubrication and tribology in all its points: friction, put on lubricants (liquid, stable, and gas), greases, lubrication ideas, purposes to numerous mechanisms, layout ideas of units incorporating lubrication, upkeep, lubrication scheduling, and standardized checks; in addition to environmental difficulties and conservation. the knowledge contained in those volumes will reduction in attaining potent lubrication for keep watch over of friction and put on, and is one other step to enhance knowing of the complicated elements occupied with tribology. either metric and English devices are supplied all through either volumes

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Additional info for CRC Handbook of Lubrication: Theory and Practice of Tribology, Volume II: Theory and Design

Example text

When the adsorbing species is molecular, chemisorption may be a two-step process, first dissociation of the molecule upon contact with the energetic clean surface followed by adsorption of the dissociated constituents. Chemisorption is a monolayer process. Bond strengths are a function of chemical activity of the solid surface (surface energy), degree of surface coverage of that adsorbate or another adsorbate, reactivity of the adsorbing species, and its structure. The higher the surface energy of the solid surface, the stronger the tendency to chemisorb.

No other bonding type possesses such a wide range of strengths. Copyright © 1983 CRC Press LLC Volume II 27 FIGURE 10. The principle types of crystalline binding forces. CHEMISTRY OF SURFACES Clean Surfaces Very clean surfaces are extremely active chemically. A copper atom which lies in a (111) plane in the bulk of the solid will have a coordination number of 12: it is bonded to 12 nearest neighbors. That same copper atom at the surface will, however, have a coordination number of only 9 with only 9 nearest neighbors.

There are at least three causes for rolling resistance. The first arises from the strains within each of the solid bodies in the region of contact. During rolling a point in each body passes through complex strain cycles; since energy is lost during a cycle of strain in all materials, energy must be supplied to sustain rolling. The second reason for rolling friction is due to differences in distortion of the contacting bodies. This can be seen by pressing the eraser of a pencil into the palm of the hand.

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