Need adhesive with no Carbon or Oxygen 1

[tomwalz]

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.

http://www.carbideprocessor.com

 

[unclesyd]

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.

 

[tomwalz]

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.

http://www.carbideprocessors.com

 

[unclesyd]

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.