×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Cobalt - Diamond

Cobalt - Diamond

Cobalt - Diamond

(OP)
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?

 

RE: Cobalt - Diamond

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.

RE: Cobalt - Diamond

(OP)
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

RE: Cobalt - Diamond

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.
www.carbideprocessors.com

Good engineering starts with a Grainger Catalog.    

RE: Cobalt - Diamond

Quote:

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.

 

RE: Cobalt - Diamond

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.
  

RE: Cobalt - Diamond

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

RE: Cobalt - Diamond

(OP)
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




 

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources