Graphite Bearing Material for Seawater Pump 1

[enirwin]

I'm currently using US Graphite Grade 14 as a plane bearing material in a seawater pump. My problem is that the material is hygroscopic. Over time, it swells and takes up my pump clearances. Is anyone aware of a graphite bearing material that is not hygroscopic?

Thanks,

Eric

 

[known100]

To: enirwin (Mechanical)
Your query from 18 Oct.

Why has it to be graphite containing?
We on board are long ago "off" from this material, except when polishing, then using it in powder form.
Graphite in any grease form will one day cake or crust, even when contained in oil.
Now we wait till a manufacturer starts throwing......!!

And for places 'open' so sea-spray or even water-on-deck during rough weather, we use *COPASLIP*.
Anti seize assembly compound.
Quite expensive but very satisfactory.
*COPASLIP* is manufactured by *MOLYSLIP*
It never hardens, sets or melts.
Unaffected by expansion, contraction or vibration and is lead-free. As a price indication: 5kg = PdStl. 57.-

For further information:

http://www.finning.ca/products/parts/datasheets/

(Not *COPASLIP* related) But molybdenum (MPGM)

And more drastically measures:

http://www.graphalloy.com/html/where_to_use.html

Hope to lead you lead-free (watch the pronunciation here!)

Known100
(Marine Dredging)

 

[enirwin]

The graphite is actually the bearing material, not a compound. The bearings are machined from bars of the material. This material was selected for the bearing because it works well with poor lubrication.

 

[kenvlach]

Teflon(TM)-impregnated graphite is used in heat exchangers for corrosive applications. Machine a batch of bearings, impregnate, and do a trial.
Let us know the results.

 

[known100]

To: enirwin (and kenvlach)
Coming back to the query: 'Graphite Bearing Material'

Mentioned already a link to *Graphalloy*
I do not know whether you were successful in the meantime.

May the following link be yet something helpful:

http://www.thomasregister.com/olc/27728005/

From "GraphiteMetallizing Corporation" in Yonkers, New York
sales@graphalloy.com for queries.
In the web among others:
Self Lubricating; Oilless; Low coefficient of friction.

 

[unclesyd]

You might checkout this site for the “Feroglide” Bearing Material

http://www.tenmat.com/bearings/index.html