Burnish (ing): To alter the original manufactured surface of a sliding or rolling
surface to a more polished condition or to apply a substance to a surface by
rubbing.
Catastrophic wear: Rapidly occurring or accelerating surface damage, deteriora-
tion, or change of shape caused by wear to such a degree that the service life
of a part is appreciably shortened or its function destroyed.
Cavitation erosion: Progressive loss of original material from a solid surface due to
continued exposure to cavitation or wear of a solid body moving relative to a
liquid in a region of collapsing vapor bubbles that cause local high-impact
pressures or temperatures.
Checking: See craze cracking.
Chemical wear: See corrosive wear.
Coefficient of friction: Ratio of the force required to initiate or maintain motion
between to bodies, F, and the force pressing these bodies together, N, F=N.
Compound impact wear: Impact wear when there is a component of relative velocity
parallel to the interface between the impacting bodies.
Coulomb friction: A term used to indicate that the frictional force is proportional to
the normal load.
Corrosive wear: A wear process in which chemical or electrochemical reaction with
the environment predominates. (Also called chemical wear.)
Craze cracking: Irregular surface cracking associated with thermal cycling. (Also
called checking.)
Deformation wear: Sliding wear involving plastic deformation of the wearing sur-
face or in impact wear of elastomers, the initial stage of wear not involving
material loss but progressive deformation, generally approaching an asympto-
tic limit.
Delamination wear: A wear process in which thin layers of material are formed and
removed from the wear surface or a wear process involving the nucleation and
propagation of cracks so as to form lamellar wear particles.
Diffuse wear: Wear processes involving diffusion of elements from one body into
the other, such as those often occurring in high-speed cutting tool wear, gener-
ally requires high temperatures.
Diamond film: A carbon-composed crystalline film that has the characteristics of
diamond.
Diamondlike Film: A hard, non-crystalline carbon film.
DLC: Diamondlike carbon coatings.
Droplet erosion: Erosive wear caused by the impingement of liquid droplets on a
solid surface.
Dry-film lubrication: Lubrication resulting from the application of a thin film of a
solid to a surface.
Dry sliding wear: Sliding wear in which there is no intentional lubricant or moisture
introduced into the contact area.
Dynamic friction: See kinetic friction.
Ductile erosion behavior: Erosion behavior having characteristic properties that can
be associated with ductile fracture of the exposed solid surface, such as consid-
erable plastic deformation preceding or accompanying material loss from the
surface which can occur by gouging or tearing or by eventual embrittlement
through work hardening that leads to crack formation.
Electrical discharge wear: Material removal as a result of electrical discharge.
Copyright 2004 by Marcel Dekker, Inc. All Rights Reserved.