ARC Spray for Bearing seat rebuilding

[shantanu]

Hi All,

A customer requires a bearing seat to be rebuilt to approximately 5 mm on diameter. The bearing fitment procedure is such where in I.D. of the bearing is heated for expansion (temp not known) and then placed over the seat of the shaft. On cooling (again, whether cooling is rapid or atmospheric not known), the bearing shrinks and clasps the seat.
What material would be recommended to repair such a seat and what are the chances of a thermal sprayed coating failing due to the expansion and contraction due to the heat of the bearing. Also, the coating would be 2.5 mm thick, hence probably less elastic than a thinner coating.
I was contemplating a material like TAFA 95 MXC....comments would be helpful
Regards

Shantanu

[loriolo]

Hi shantanu
Bearing to be mounted on shaft with some interference, ussually are heated in hot oil, at about 120 °C, so there is not problem to apply an adeguate material, it can be Tafa 95 or sulzer Metcoloy 2, both work very well , ther is not problem with thermal expansion.

[HVoilF]

Hello ,I agree with Luigi, no problem with this application if the bearing is heated in an oil bath at some 120-150ºC Probably the best material would be Stainlees steel 420 (Metcoloy 2)over a bond coat of Ni-Al ,flame or arc sprayed. The coating will any way works in compression,no problem at all!

[shantanu]

(05-15-2013 04:18 PM)HVoilF Wrote:  Hello ,I agree with Luigi, no problem with this application if the bearing is heated in an oil bath at some 120-150ºC Probably the best material would be Stainlees steel 420 (Metcoloy 2)over a bond coat of Ni-Al ,flame or arc sprayed. The coating will any way works in compression,no problem at all!

Thanks for your replies. I was considering between 95 MXC, metcoloy II and al-Br coatings. Our replies have made the choice easier and possibly to also the cheapest choice!
Regards

Shantanu