DIY Aluminum Bronze. One of the Hardest Bronzes

6,549

63

12

For one of future projects I need some hard bronze, that's why I decided to make Aluminum Bronze. This bronze is one of the hardest!

Step 1: Bronze Content

This bronze will consist of 88% of copper and 12% of aluminum. Melting process is simple. At first I need to melt copper. So when I reach the temperature 1100-1200 C, I'll add aluminium. Finally, I suppose to get 2 kg of hard aluminum bronze.

Step 2: Copper Started Melting

When copper started melting it's time to add more copper and after that aluminum.

Step 3: Casting Time

Metals were melted and mixed. Casting time...

Step 4: The Quality

The quality of the round bar is not very good. There are some pores inside (in the centre). The second ingot is fine.

Step 5: Cutting the Upper Part

Cutting the upper part to see pores.

Step 6: Weight and Hardeness

I've made 2 kg (4.4 lbs) of aluminum bronze which I'd use for some projects. After processing on the lathe it's easier to see pores. This grade of bronze is really hard.

Step 7: Crucible

The crucible was damaged because the temperature was too high. Anyway the work was done. Some time ago I've already made Lead Bronze (it's on the right on the photo, push the link to read) and it's completely opposite to this one.

Share

    Recommendations

    • Big and Small Contest

      Big and Small Contest
    • First Time Author

      First Time Author
    • Toys Contest

      Toys Contest

    12 Discussions

    0
    None
    DuralMfredlam

    Reply 1 year ago

    It was made of stainless steel! Therefore its melting temperature must be 100-200 C higher than cheap grade carbon steel. Now I started to use graphite crucible.

    0
    None
    gm280

    1 year ago

    I watch a lot of smelting and pours all the time. And one thing I don't see much of is fluxing the liquid metals before pouring. I melt tons of lead and make ingots from that. And I always flux the metal with some sort of wax. Be it a candle, crayon or what ever I have. I flux the liquid lead and it allows more of the slang that floats on the top, mix back into the lead to yield a much stronger finished pour. But I don't see anybody doing the fluxing with aluminum or copper. Why not? I believe it would also help with reducing metal separation when melting. Just wondering.

    1 reply
    0
    None
    DuralMgm280

    Reply 1 year ago

    It's always a good idea to use some flux. I use borax for brass, copper and bronze. And salt for aluminum. I don't remember if I used it this time but when I want to get a good quality I always use some fluxes. I think a lot of people use fluxes that's just not always on camera or in a text :)

    0
    None
    kickinit233

    1 year ago

    Very cool aluminum bronze is on of my favorite metals only behind durilium and beryllium copper.

    1 reply
    0
    None
    DuralMkickinit233

    Reply 1 year ago

    Yes. I completely agree. It's enough cheep alloy which has awesome technical characteristics!

    0
    None
    Lorddrake

    1 year ago

    the 88:12 ratio .. is that by weight or by volume?

    1 reply