by stephen huse. outline abrasion and adhesion description variables that change the wear rate...
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Wear Mitigation by the Use of Surface Coatings
by Stephen Huse
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OutlineAbrasion and adhesion description
Variables that change the wear rateVariables changed by coatings
Surface coating processesPhysical Vapor Deposition (PVD)Chemical Vapor Deposition (CVD)ElectrodepositionThermal Spray
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AbrasionPhysical interference of
surface asperitiesTypes:
CuttingCracking (brittle fracture)Ploughing
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AdhesionCold weld of surface
asperitiesSimilar materials such as
steel on steel Wear removes oxide layer
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Variables That Change the Wear RateFriction
Surface roughnessNormal Forces
Temperature Surface hardness Surface materials Environmental
considerationsH
KN
L
V
NF ksf ,
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Variables Changed by CoatingsSurface Hardness
Reduces abrasive wearMay increase brittleness
FrictionReduces force for toolingReduce heat generated
Surface MaterialsReduces adhesive
bondingExample: steel - steel
becomes steel - ceramic coating - steel
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Physical Vapor Deposition ProcessVacuum environmentcoating powder is melted and
transported to substrateCathodic arcElectron beamPlasma torchMagnetic
Coating condenses on substrateNASA plasma spray PVDAdvantages
High HardnessLow friction
Disadvantage: requires line-of-sight
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Chemical Vapor Deposition ProcessChemically controlled atmospheric
environment. Substrate heated to 2000°FAtmosphere chemically reacts at
surfaceExamples:
Titanium cloride (gas), nitrogen, and hydrogen → titanium nitride coating
Titanium chloride (gas), methane, and hydrogen → titanium carbide coating
Superior adhesion of the coating to the substrate
Used for synthetic diamond growth
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ElectrodepositionExample: Chrome platingResists corrosive wearIncreased hardnessReduced friction
Thermal SprayExample: Plasma spraySimilar to PVD, but no vacuumSubstrate is preheated to
remove impurities
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Referenceshttp://
www.diamondtc.com/diatiger/about.htmlhttp://www.Gordonengland.co.ukhttp://www.signalplating.comhttp://www.sulzer.comhttp://www.surface.mat.ethz.chhttp://www.pall.comhttp://www.manmadediamondinfo.comhttp://www.ptli.comhttp://www.directindustry.com
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End