Cobalt - Diamond

[crazylazy]

hello i'm new to this forum.

is it possible to have a cobalt alloy pressure vessel incorporating polycrystalline diamonds to reduce thermal expansion and friction, while increasing rigidity, wear rate?

 

[TVP]

This is Star Trek technology, not practical pressure vessel technology that is covered by design codes and standards like ASME B&PV or EN 13445. And before someone posts about incorporating diamond particles into coatings and other items, I am aware that this is theoretically possible.

 

[crazylazy]

thank you for the reply TVP, can you suggest another material to aid in the reduction of thermal expansion and friction, and increasing rigidity and wear rate.

has to cope well in an environment where temperatures will reach around 600deg F, varying pressures up to about 60-70,000PSI and resist corrosion from salt water.

any suggestions appreciated

 

[tomwalz]

Sure. It is possible.

But then I'm 65. Most of the stuff on my desk is impossible according to my high school science.

People will tell you something is impossible before you try it.
They will tell you it is impossible while you are working on it.
They will even tell you it is impossible while they stand there and watch you do it.

However TVP’s post is excellent


Thomas J. Walz
Carbide Processors, Inc.

http://www.carbideprocessors.com

Good engineering starts with a Grainger Catalog.

 

[metengr]

is it possible to have a cobalt alloy pressure vessel incorporating polycrystalline diamonds to reduce thermal expansion and friction, while increasing rigidity, wear rate?

No.

 

[TVP]

crazylazy,

I think you need to consider a design that does not require the structural shell of the pressure vessel to do everything, meaning to be strong and stiff, to have some type of defined friction behavior, to resist corrosive elements, etc. Perhaps you could design a PV such that there is an inner lining that resists salt water at elevated temperature, followed by a structural element that provides the basic shape, strength, etc., which is then supported by an outer layer or structure for improved stiffness, etc. A Google search using "multilayer pressure vessel" will return many hits.

 

[EdStainless]

They do this with explosively bonded plate now. Put 0.060" of C276 onto a structural steel and you have the thermal exp and cond of steel with the corrosion resistance of a Ni alloy.

A more exotic inner layer is possible, but fabrication of transitions is usually the killer with these concepts.

= = = = = = = = = = = = = = = = = = = =
Plymouth Tube

 

[crazylazy]

TVP,

thank you for your follow-up post, not sure why i hadn't considered this approach before. I will look into a multilayered design.

this may allow a heat sink to be incorporated into the design to help reduce temperature therefore reducing thermal expansion.

a ceramic lining could improve corrosion resistance and reduce friction