New coating technology?

[moondog]

Robust macroscale superlubricity on carbon-coated metallic surfaces

This paper discusses experimental and computational results of ultralow (near-zero) friction of carbon-coated metallic depositions on substrates of st…

www.sciencedirect.com

 

[DaveTooley]

And the application here is?

 

[LVLAaron]

Really expensive mandrels, that will still gall. Just my guess.

 

[ShtrRdy]

Looks like they need to get the material to be treated to 900° C. It sounds pretty slick (no pun intended)

 

[Will Henry]

To put this in plain language, they cook carbon into the surface by cooking the part in some sort of biowaste. Anyone know a synonym for biowaste (Rhymes with "snap")? In many respects, it sounds similar to a process I devised. I baked the mild steel parts (bushings and shafts) in my own recipe for biocarbon (bone meal and powdered milk) after treating them with a sprayed-on application of moly disulfide. Parts were baked in a crucible, packed in the "biocarbonaceous" mix, at a temperature of about 1600 degrees F, for three hours. They were then allowed to cool to 1325 F, then quenched in a water soluble oil emulsion. The result was a very hard surface which offered impressive lubricity. The purpose was to extend the life of parts in an abrasive environment, and it worked. I could probably have published in a scientific journal but my insistence on using terms like "really hot fire" instead of "Controlled thermal source", and "big slippery parts" instead of "macroscale superlubricious behavior" pretty well put paid to that. WH

 

[LVLAaron]

To put this in plain language, they cook carbon into the surface by cooking the part in some sort of biowaste. Anyone know a synonym for biowaste (Rhymes with "snap")? In many respects, it sounds similar to a process I devised. I baked the mild steel parts (bushings and shafts) in my own recipe for biocarbon (bone meal and powdered milk) after treating them with a sprayed-on application of moly disulfide. Parts were baked in a crucible, packed in the "biocarbonaceous" mix, at a temperature of about 1600 degrees F, for three hours. They were then allowed to cool to 1325 F, then quenched in a water soluble oil emulsion. The result was a very hard surface which offered impressive lubricity. The purpose was to extend the life of parts in an abrasive environment, and it worked. I could probably have published in a scientific journal but my insistence on using terms like "really hot fire" instead of "Controlled thermal source", and "big slippery parts" instead of "macroscale superlubricious behavior" pretty well put paid to that. WH

I would enjoy having a beer with you sir.

 

[hdskip]

In what way does this differ from case hardening?

 

[Will Henry]

In what way does this differ from case hardening?

It's superlubricious! WH

 

[L.Sherm]

Will in your opinion would it be tougher than Nitride? How about use on an action?

 

[Will Henry]

Not necessarily tougher, and maybe not as hard, but thicker than nitride. There is a real issue with some of these treatments for use on an action because the process isn't compatible with the heat-treating process. I would think the addition of a carbon hard surface to 4140 might require some modification of the heat treat process. I seem to remember trying the moly/carburizing on some stainless, but my recollection is vague (it was thirty years ago!). I was working on stuff for a fairly corrosive mining environment. WH