Melting Point of Copper alloy

[TabuTron]

Hello, All!

I'm trying to a solid-state chemical reaction in molten metal. Ideally I would use pure copper as this is included in my reaction anyway, but the oven I have available is not capable of sustaining the needed 1083°C. 1000°C is the limit it can handle.
I am therefore looking for a metal I could add to lower the melting point of copper, ideally forming an eutecticum.

Any ideas? Maybe tin could work...I'd rather not use aluminum, as this easily reacts with the boron which is also included to form Aluminiumborides.

Sincerely,

Michael
University of Hamburg, Germany.

 

[Goahead]

Silver-copper eutectic normally used for brazing contains 72% Ag and 28% Cu, melts at 766C.
Other non eutectic alloys are available for brazing.
Would they suit your purposes?

http://www.welding-advisers.com/

 

[TabuTron]

Hello, Goahead,

Yes, I think the Ag/Cu eutectic might be a good idea. About non-eutectic alloys: I don't think that I will buy a brazing alloy but rather compose it from the elements.

On that welding-page you mentioned - is there information about the composition of those alloys? A quick browse only showed me information about the process of welding...

Sincerely,
Michael
University of Hamburg, Germany

 

[kenvlach]

There is a large, online collection of binary phases diagrams at

http://cyberbuzz.gatech.edu/asm_tms/phase_diagrams/

Perhaps Cu-Si would work. It is 100% liquid from about 82 to 94 wt% Cu at 900 C, and from 75 to 95 % Cu at 1000 C.

 

[JimMetalsCeramics]

Aside from Cu-Si:

http://www.lucasmilhaupt.com/htmdocs/brazing_products/brazing_filler_metals/copper.html

http://www.lucasmilhaupt.com/htmdocs/brazing_products/brazing_filler_metals/copper_phosphorus.html

 

[TabuTron]

Hello, All!

Thank you very much, this online collection of phase diagrams was exactly what I've been looking for.

Cu-Si might be a nice Idea, I'll definitively try that. Maybe even Cu-P, although I'm not entirely sure whether the copper borides I'm trying to make like the presence of phases like Cu3P...

Sincerely,
Michael