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thin-film lubrication

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Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006398
EISBN: 978-1-62708-192-4
... two surfaces Fig. 11 Schematic depiction of (a) thick-film and (b) thin-film lubrication Fig. 16 Schematic representation of the spacing parameter ( S m ) (ISO 4287/1) Fig. 17 Various surface profiles having the same average roughness and mean peak spacing values. R sk...
Series: ASM Handbook
Volume: 19
Publisher: ASM International
Published: 01 January 1996
DOI: 10.31399/asm.hb.v19.a0002373
EISBN: 978-1-62708-193-1
... in bearings. An example is shown in Fig. 6 . This feature can show up over the entire raceway surface. It is often the result of too thin a lubricant film or excessive surface roughness and sometimes heavy loading. Contact fatigue occurs in gears along the pitch line. The geometry of tooth mesh...
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006403
EISBN: 978-1-62708-192-4
..., the surface finish, the residual stresses, and the use of coatings or surface treatment. For example, surface finish is especially important in journal bearings and rolling-contact bearings, where very thin lubricant films are needed for the performance of the bearings. If the surfaces are too rough, the high...
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006412
EISBN: 978-1-62708-192-4
... of the zinc-base alloys seems to derive from their chemical behavior with hydrocarbon lubricants. Formation of a stable low-shear-strength film of zinc-base soap appears to be an important factor. Oil-impregnated porous metal bushings can also be included in the single-metal systems category...
Series: ASM Desk Editions
Publisher: ASM International
Published: 01 December 1998
DOI: 10.31399/asm.hb.mhde2.a0003167
EISBN: 978-1-62708-199-3
.... Single-metal systems do not exhibit outstandingly good surface properties, and their tolerance of boundary and thin-film lubrication conditions is limited. As a result, the load capacity rating for a single-metal bearing usually is low relative to the fatigue strength of the material from which...
Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.a0005138
EISBN: 978-1-62708-186-3
... and corrosion prevention. Boundary lubricants are thin, absorbed films and are usually subjected to high unit pressures. Thin-film lubricants are of two basic types: Chemically active constituents of typical boundary lubricants are sulfur, chlorine, and phosphorus compounds. Certain types of oil...
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006370
EISBN: 978-1-62708-192-4
... of the solid lubricant. Mirror quality finishes can be obtained in metal forming by using highly polished tooling and thin lubricant films. This is mainly due to workpiece asperities being flattened. This phenomenon also has a large effect on the magnitude of friction stresses that will be developed...
Series: ASM Handbook
Volume: 14B
Publisher: ASM International
Published: 01 January 2006
DOI: 10.31399/asm.hb.v14b.a0005159
EISBN: 978-1-62708-186-3
... emulsion stability Fig. 3 Examples of molecular species contained in petroleum oils Fig. 4 Examples of molecular structures of four classes of synthetic fluids Fig. 1 Three lubrication regimes experienced in sheet metal forming. (a) Thick-film lubrication. (b) Thin-film...
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006409
EISBN: 978-1-62708-192-4
... the contact zone. Historically, thin-film lubrication has been described via Reynolds’ theory ( Ref 39 ). Starting from the classic Navier-Stokes equations: (Eq 32) ∂ ρ ∂ t + ∂ ρ u i ∂ x i = 0 (Eq 33) ∂ ρ u i ∂ t + ∂ ρ u i u j ∂ x j...
Series: ASM Handbook
Volume: 18
Publisher: ASM International
Published: 31 December 2017
DOI: 10.31399/asm.hb.v18.a0006402
EISBN: 978-1-62708-192-4
... Thin-film acceptable Analysis of adsorption performance of gases and lubricants (Fourier transform infrared spectroscopy, reflection absorption spectroscopy, attenuated total reflection spectroscopy, polarization) LEED Low-energy electron diffraction Electron Electron (diffraction) Molecular...
Series: ASM Handbook Archive
Volume: 11
Publisher: ASM International
Published: 01 January 2002
DOI: 10.31399/asm.hb.v11.a0003524
EISBN: 978-1-62708-180-1
... attachment and film for use in photographing metallographic specimens Equipment and materials for mounting and etching specimens A handheld single-lens reflex 35-mm camera, with macrolenses and film A pocket-size magnifier, and a ruler or scale A hacksaw and blades for cutting specimens...