By K. Holmberg, A. Matthews

This booklet provides a normal view on skinny floor coatings used for tribological functions and it really is in accordance with the present nation of figuring out. The mechanisms of friction and put on in sliding and rolling contacts of lined surfaces are defined. simple details on coating innovations, tribology and floor mechanisms is given. in keeping with accumulated experimental works details is given at the homes of skinny gentle coatings, equivalent to polymer, lamellar good and gentle steel coatings; skinny demanding coatings, reminiscent of nitride, carbide, oxide, boride and diamond and diamond-like coatings; and multi-component and multi-layer coatings. The impact of interface layers and lubricants is highlighted. The equipment on hand for characterization of lined surfaces and for mechanical and chemical review in their tribological houses are defined. Tribological assessment tools for speeded up and box trying out and the necessity for standardization of caliber insurance strategies are mentioned. a strategy for the choice of skinny coatings for tribological purposes is gifted and information established professional method methods for coating choice are reviewed. for various program examples, the fundamental tribological touch mechanisms are defined and the chances for bettering their tribological houses through the use of floor coatings are mentioned. the applying examples contain sliding and rolling bearings, gears, instruments for slicing and forming, erosion resistant purposes, magnetic recording platforms and bio-medical implants.

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Consequently, the coefficient of friction in the initial stage is largely independent of material combinations, surface conditions and environmental conditions. -2 LL I I1 1 1 I I I I 2 3 I I I I 4 5 6 - Sliding distance, s Fig. 7. Six stages of friction mechanisms occurring in sliding steel contacts in the initial period of sliding (after Suh and Sin, 1981). Stage 2. The polishing wear process at stage 1 has removed surface contamination and elements of bare surface will appear, resulting in a slow increase in the coefficient of friction due to increased adhesion.

G. austenitic manganese steel. This, asdeposited, is relatively soft (approx. 170 Hv), but hardens to about 550 Hv when subjected to impact conditions. This material gives an example of how the processing route can affect the coating properties. The austenitic structure of manganese steel is normally produced by a water quench from about 980°C. The alloys used for welddeposition are usually formulated to ensure that the austenitic structure is obtained on air cooling from the welding temperature (HMSO, 1986).

Thus both friction and wear are simultaneously the results of the same tribological contact process that takes place between two moving surfaces. However, their interrelationship is not well understood. 9 by Saka (1980). g. Franklin, 1991) of contradictory behaviour. The figure also illustrates another typical feature. The value for the wear coefficient may well change, in different conditions, by several orders of magnitude in relation to changes in the coefficient of friction, which very rarely changes by even one order of magnitude.

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