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Need a Super high temp dry lubricant

Need a Super high temp dry lubricant

(OP)
I'm searching for a lubricant to use in a new design an associate and i am working on. Were looking for something simliar to teflon, but with lower Friction coeficiants and much much higher temperature capabilities.

If any one has heard of something down that lines that could reach 3000F i would love the help.

RE: Need a Super high temp dry lubricant

What temperatures will graphite withstand ?

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pat   pprimmer@acay.com.au
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RE: Need a Super high temp dry lubricant

The only thing I can think of is MgO (Milk of Magnesia), but the friction is going to be FAR higher than Teflon.

RE: Need a Super high temp dry lubricant

Dicronite... Go to www.dicronite.com.  They may have all the answers you desire.  I believe the coefficient of friction is comparable to teflon (~.2 if memory serves).  It's a hard coat, 20 millionths thick.  Tungston carbide, I believe.  Anyway, check out the site.

ChemE, M.E. EIT
"The only constant in life is change." -Dan Andia; 1999, Chemical Engineering Progress

RE: Need a Super high temp dry lubricant

Graphite and hexagonal boron nitride might be able to withstand the temperature.  If there's oxygen around, graphite will turn rapidly into carbon dioxide or monoxide.  Boron nitride will also oxidize, going to boron oxide, but this might be good -- boron oxide is also a good lubricant.

Jim Treglio
Molecular Metallurgy, Inc.

RE: Need a Super high temp dry lubricant

I definitely concur with Jim regarding BN-- very good temperature resistance in a range of environments.  Graphite will definitely oxidize at 3000F in the presence of even minute amounts of oxygen.

RE: Need a Super high temp dry lubricant

(OP)
Im afraid graphite probably is not going to be an option. Dicronite's product is looking like a possability. The reason for this is that this is going to be in the pressence of gas combustion, So oxegen is going to be very prevolent in this enviroment. Max temp on dicronite is only 1000F, but under vacume 3000F, dont know where this is going though

RE: Need a Super high temp dry lubricant

There is a coating that goes on one molecule thick that has tolerated temperatures in your range.  You can find it at www.kiss-cote.com.  It's worth looking at.

Malcolm

RE: Need a Super high temp dry lubricant

Dichronite's product is tungsten disulfide.  I doubt it will hold up at your temperature in the presence of oxygen.  Kiss-cote's product is a polymer, has carbon and hydrogen so it too will likely oxidize.

Jim Treglio
Molecular Metallurgy, Inc.

RE: Need a Super high temp dry lubricant

The Kiss-Coat extremely thin coating will withstand your temperature unless it is exposed to open flame.  It can tolerate much higher temperatures.

www.kiss-cote.com

RE: Need a Super high temp dry lubricant

Here is website that might have your answer in a Yttrium Oxide Coating. This material is useful over 3000°F.
You need to give them a call as the have a like of things in development at all times.

http://www.zypcoatings.com/

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