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Coating
Selection for rolling or rolling/sliding situations |
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In rolling element bearings and related rolling components the
base material is usually a temper-sensitive C/Cr steel or martensitic
stainless steel. Clearance restrictions and distortion restraints leave
few options for surface engineering, but the following can be considered:
- PVD Coatings e.g. TiN, CrN, etc.
Processed at less than 300oC
- CVD coatings for balls, with careful heat-treatment to avoid distortion
- Oxide Treatments e.g. caustic treatment of needle rollers
- Hard Chrome Plate a thin, dense variety
restricted to about 5µ thick
For gears, where the motion is combined rolling and sliding, the
main options are:
- Carburising (Case-Hardening) for low carbon steels to give high hardness
and wear resistance
- Local hardening (Induction) for medium carbon steels to give maximum
load capacity
- Nitriding for alloy steels and lower loads
In some cases, clicking on the coating type will take you to the appropriate
Poeton product.
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