Posted by Gordon England on June 10, 2003 at 12:13:40:
In Reply to: Turbine shaft coatings posted by Matt on June 10, 2003 at 04:33:55:
: experiencing Babbitt bearing material "pick up" when running against a steam turbine shaft journal coated with 13Cr steel (via arc spray). Coating was finish ground and polished and applied within all normal parameters. surface of coating appears normal, ie. no excess porosity and bearing material has not marked the coating surface either.
: bearings were blued against shaft and checked for clearence prior operation yet we still had bearing seizure.
Hi Matt
I would check that your lubrication system is working and is sufficient. Failure occurs when the lubricating film between the two surfaces fails to provide separation of the surfaces. Poor bearing alignment, clearance or surface finish will also exacerbate this situation. Thermal spray 13% Cr steel coatings normally provide very good service against white metal bearings.
Regards Gordon
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