I'm trying to mix an alloy for casting.
The base metal must be copper and the desired physical properties are
- melting point as low as possible but below 1000°C (my makeshift crucible won't stand more than 1000°C)
- silvery appearance, yellow shade is acceptable
- no excess slag development
- mechanical properties aren't important
Here's what I investigated so far. My desired material initially was nickel silver (Cu-Ni-Zn) with an approx melting point of 900°C. I had some material which I considered to be nickel silver but I found out it was high grade copper with a thin plating of nickel silver. I have limited access to other materials. I think I have to mix significant amounts of some white metals into it to get brighter colors and lower melting points.
What I have at hand is:
- several sorts of brass (fittings and pipes)
- CuNiFe (Pipes)
- Sn60Pb40 (Solder)
- Pb60Sn40 (Solder)
- Ag (brazing solder)
Maybe I can find materials containing higher percentages of nickel or zinc. Special condition: I can't buy any material.
I want to avoid using the Pb contaning solder for health reasons if possible. Maybe there's a CuAg alloy with silverish appearance? How much silver do I have to add? What other alloys are possible?