Heat Treatment for Silver-Copper Alloy 2

[aklemet]

Hello!

My materials and heat treatment knowledge is amazingly rusty!

I have a 85% Silver, 15% Copper strip that is formed a particular way in a fixture, and then "baked" (still in the fixture) in an oven that has been purged with 96% Nitrogen, 4% Hydrogen for 2-3 hours.

What sort of differences would I expect, if any, if I were to use 95% Nitrogen, 5% Hydrogen?

Thanks!
A Klemet

 

[metengr]

No real change based on what you have provided, and a quick review of literature I have available.

 

[EdStainless]

You are using the H to reduce oxidation, if the purge was very good and the N was very dry then you might get away with 2%. A little variation each way won't matter. What matters is that the oxygen and dew point are very low.

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P.E. Metallurgy, Plymouth Tube

 

[Lyrl]

4% hydrogen is considered safe. 5% hydrogen is considered a safety hazard due to explosion potential.

 

[aklemet]

Thanks for the help!

A Klemet

 

[EdStainless]

Though in reality you have to get to 7 or 8% before you can get flame or explosion risk.


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P.E. Metallurgy, Plymouth Tube

 

[gruntguru]

And that's in air not nitrogen. Explosion risk doesn't occur unless the gas leaks out and with 5% H2 in the gas you are never going to get 5% in a gas/air mix.

je suis charlie