Shrink fitting of coated shafts using low temperatures
04-02-2007, 04:51 PM,
Shrink fitting of coated shafts using low temperatures
Dear All,
what is the minimum temperature to which Arc sprayed shaft with 13% Chrome steel can be subjected while carrying out shrink fitting.
Will there be cracks due to change in properties? what is the best material for this appication
Vijay Deshpande
04-03-2007, 01:49 PM,
RE: Shrink fitting of coated shafts using low temperatures
Hi Vijay

As far as I know, there should not be a problem with this as long as the coefficient of expansion properties of the coating and substrate are not too different.
04-15-2007, 08:03 AM,
RE: Shrink fitting of coated shafts using low temperatures
Dear Vijay,
You can try with dry ice.Time for treatment shall depend on the dia. of shaft.
For theoretical calculations for optimum sub-zero temperture you need to use co-efficient of thermal expansion data in the low temperature range for the given material.
I would be careful about the surface preparation(Ra values),alignment during fitting etc, remembering the basics that the spray coat can crack or spall due to impact or bending or point load.
ram chattopadhyay

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