×
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

Need adhesive with no Carbon or Oxygen

Need adhesive with no Carbon or Oxygen

Need adhesive with no Carbon or Oxygen

(OP)

I am looking for an adhesive to fixture parts for brazing.   It must break down witheat without oxidizing the surfaces of leaving Carbon.  Ideally it would be something, involving Bromine, Boron, Fluorine and Hydrogen.  

Thanks,
Tom

Thomas J. Walz
Carbide Processors, Inc.
www.carbideprocessor.com

RE: Need adhesive with no Carbon or Oxygen

Tom,
Comeback with exactly what you are trying to do.   

The base materials you mention are very, very reactive around metals.  

With ceramic cements the "O" is chemically bonded and will not react with metal. Get above 900°F and Carbon will burn off with the exception of Glassy Carbon.   I have used several different ceramic adhesives as a scaffold for brazing tools steels.  On some real delicate parts I used ceramic foam to restrain the parts.  

RE: Need adhesive with no Carbon or Oxygen

(OP)
Uncle Syd,

Thank you.  I was hoping to hear from you.

We pretin tungsten carbide.  We melt the braze alloy onto saw tips and then ship them to saw mills, etc.  The braze alloy is remelted to fasten the carbide to the saws.   

We will sometimes have a part that is .250” wide and  .500 inches long with a matching flat piece of braze alloy.   We feel we need a very small amount of fluxing action between these two parts.  We have an adhesive flux but it is not strong enough to keep the parts together during shipping.  We have tried glues, epoxies, etc  and they seem to contaminate the surfaces and make for a very poor bond.  Our hypothesis is that something such as a cyanoacrylate breaks down to release free carbon or carbon based compounds that interfere with the brazing.  

tom

Thomas J. Walz
Carbide Processors, Inc.
www.carbideprocessors.com

RE: Need adhesive with no Carbon or Oxygen

You probably have queried everyone in the business but here goes.
We got a lot of assistance from Lucus-Milhaupt (now H&H) on some very tricky brazing procedures.   We weren't specifically looking for adhesive qualities in our endeavor but we found it when using very fine particle sizes and a liquid flux.

http://www.lucas-milhaupt.com/index.html

Checkout the NicroBraze cements.  Give the a call.

http://www.wallcolmonoy.com/Products/brazing.htm


Here are some more materials we used on various procedures.   you might give these people a call also

http://www.vitta.com/bproducts.html#Gel

As I recall the most adhesive material we used was black.  Am still looking for the name.

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