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Babbiting


Spray Babbitting is recommended for applications on heavy duty or high speed bearings. Utilising the thermal spray technology we are committed to supplying quality babbitt lined bearing and parts. We provide babbitt bearing repair services as well as babbitt bearing manufacturing. Our babbit bearings are produced to the highest quality standards. We guarantee that our babbitt bearing repair products and manufactured babbitt bearings meet or exceed the needs of our customers. Raw material used while manufacturing or repairing our babbitt bearings are tested and certified to your requirements.

 

Rebabbatting services including final machining can be offered for bearings up to 6 meters in diameters.

Applications include -

 

Trunion Bearings

 

Slide Shoe Liners

 

Thrust Bearings

 

Fan Bearings

 

Fan Motor Bearings

 

Generator Bearings

 

Hyrdo Guide Bearings

 

Hydro Guide Shoes

 

Motor Bearings

 

Pump Bearings

 

Advantages of Sprayed Babbitt over conventional methods -

 

BONDS MORE RELIABLY TO THE OUTER SHELL

 

Poured linings are usually quite thick, not because of service requirements, but to facilitate pouring and to permit dovetailing. The standard method of bonding a pouring lining to the outer shell is tinning. Then when Babbitt is poured, it is necessary to maintain temperature close to the melting point of the tin, or the Babbitt will not bond to it. On big bearings especially, this heat control is very difficult, so additional mechanical anchorage is required in the form of dovetails.

 

Arc sprayed Babbitt coatings can be bonded reliably and easily to any size of bearing with a bond coat. The need for dovetailing is eliminated.


 

THINNER COATINGS CAN BE APPLIED (50 microns to <10 mm)

 

With any Babbitt bearing, poured or sprayed, thin linings have higher load capacity than thick linings. It is difficult to pour thin lining. However, one of the inherent advantages of the thermal spray process is that thin coatings are easy to apply

 

HAS HIGHER LOAD CAPACITY

 

Sprayed Babbitt has a higher load capacity than poured Babbitt because:

  a

It can be applied in thinner coatings.

  b

It bonds more reliably.

  c

It has no voids, thus increasing the surface area.

     

DOES NOT REQUIRE SALVAGE WORK

 

It is difficult to pour thick lining of Babbitt without voids and blowholes. Frequently the patching of a poured lining is necessary before the bearing can be put into service. On a big bearing this can be a lengthy, costly operation. Sprayed coatings have no defects requiring any such salvage operation.

   

PROVIDES BETTER HEAT TRANSFER

 

The use of tinning and dovetails to anchor poured lining has been discussed above. Even though the dovetails prevent the lining from actually lifting, the unreliability of the bond achieved by tinning usually permits oil to penetrate between lining and shell where it acts as a thermal barrier, reducing the transfer of heat from lining to shell. In such areas, the temperature of the lining rises, forming a "hot spot". Babbitt metal which is subject to continuous heat, or repeatedly reheated, may develop a coarse crystalline structure, reducing its strength considerably. Such hot spots are, therefore an inherent source of failure in a poured lining.


A sprayed lining, on the other hand, is completely bonded to the shell, and no hot spots can develop. Field experience has shown; in many cases that the oil temperature of a bearing is noticeably lower than the oil temperature of the same bearing with a poured lining.

   

HAS LONGER SERVICE LIFE

 

Sprayed Babbitt linings have a micro porosity, not visible to the naked eyes, which permits abrasive particles to imbed into the linings instead of remaining between the loaded areas. The sprayed coating also retains the lubricating oil better. As a result of these factors, the sprayed coatings show considerably longer service life than the poured coatings.

   

PRODUCES COATING OF GREATER INTEGRITY

 

It is easier to produce sound linings by spraying. In the case of poured linings, unless heat control is very good, there is often undesirable separation of the constituents of the alloy, resulting in premature failure of the bearing

   

ELIMINATES WARPAGE OF THE OUTER SHELL

 

This outer shells, particularly those made in two halves, are frequently wrapped when repaired by pouring linings. Arc spraying is a cold process and heat warpage is eliminated