introduction to surface engineering
DESCRIPTION
surfaceTRANSCRIPT
Introduction to Introduction to Surface EngineeringSurface Engineering
Introduction to Introduction to Surface EngineeringSurface Engineering
Presented by Presented by S.SathiyaseelanS.Sathiyaseelan
Surface engineering
Surface Engineering• PVD coatings• Coatings• Cr plate• E-Ni• Thermal spraying• Anodising
Surface Modification•Ion implantation•Energy beam processing•Thermochemical treatment
PVD Coatings
• Coating temperatures below 250°C
• Coating thickness 1-4 µm
• Surface structure and edge radii are not altered
• High adhesion of the coating
• High hardness and low coefficient of friction
• Some coating of inner surfaces is possible
PVD Process
Advantages of PVD Coatings
• Highly wear resistant materials (HV <4000)• Increased abrasive wear resistance• Anti-scuffing / anti-galling• High fretting resistance• High pitting resistance• Tribological properties• Reduced C.O.F.• Corrosion resistant materials• Combine ‘in bulk’ - and surface properties• Almost no change in tolerances; thin films• Environmentally friendly
Benefits of PVD Within
Applications• Smaller and lighter designs
• Reduced energy consumption
• Increased power density
• Cheaper base materials
• Lifetime increase
• Reduced Emissions
Properties of PVD Tribological
Coatings
Example PVD Tribological
Coating
Friction Considerations
Industrial Volume PVD Coatings
“Tribological Applications”
PVD Coatings in AutomotiveApplications
Piston area:•Piston (carbon based•coatings under•development)•Top piston ring (thick CrN)•Piston pin (W-DLC)•Sliding bearing (AlSn)•Connecting rod (CrN)Common rail:•Fuel injection plungers (WDLC)
Transmission area:
• Gears (W-DLC & B4C)
• Camshaft area
• Rollers
• Bushings
• Tappets
• Cams
Air Conditioner:
• High contact pressure (WDLC)
General Purpose:
• Roller Bearings
Opportunities for Weight Reduction
Typical application of PVD
Ion-plating-process
Fuel injection pump components
Sliding wear test
Dry running properties
Surface Engineering Solutions
Surface Engineering Solutions
Thermal oxidation
Thermal oxidation - friction
Gear . Ti64, thermal oxidation
Deep case hardening
• Nickel diffusion
• Laser/EB surface alloying
• Oxygen diffusion
Deep case hardening - oxidation
Deep case hardening - oxidation
Deep case hardening + coating
Load bearing capacity
Ti-alloys
• All the examples shown above have used Ti6Al4V alloy substrates
• 550 alloy . specially developed O-diffusion treatments can produce
• cases up to 190µm in depth• Alloys with significant β phase are
suited to diffusion treatments, but attention must be paid to their bulk heat treatment condition