Also found some lovely retro posters!
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Yesterdays #38c3 @hackertours visit of DESY was great. We saw the entrance to the HERA tunnel, the PETRA III experimental hall and lots of detectors.
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Bedrohte Spezies!
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Success!
Third time's a charm! The sodium chloride vaporized a bit much but did its job nonetheless. Next time I'll use borax and a lower temperature.
A nice ingot of Cu2MnAl formed in the crucible.
It has a golden tinge as is usual for aluminium bronzes.
And it its very magnetic! Video in the next post!
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Although those pictures are neat, I wanted to try again and get a properly mixed and melted ingot of alloy.
Suspecting the oxidation of the powder particles as the reason for the improper melting I wanted to try bigger pieces of metals.
So this time I used manganese flakes, aluminium drops and copper wire. And for good measure some sodium chloride as a flux and further protection from oxygen.
Bake at 1400°C for 60min and enjoy!
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Absolutely fascinating plethora of different shapes!
Thanks to @gigabecquerel for doing your SEM magic and taking those stunning pictures!
I wish we had an XRF detector to see the distribution of the different elements...
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Doing hot stuff again 🔥
This time it's a mixture of copper, aluminium and manganese called a Heusler alloy, named after its discoverer.
It's made from non-ferromagnetic metals but is ferromagnetic when combined!
The first time I tried it in my furnace and the mixture did not flow together properly. But it is magnetic!
So I tried the same powder mixture again but this time in a furnace that can reach 1400°C instead of only 1100°C.
And just for fun I tried to remelt the first attempt.
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I didn't assemble the LEDs myself, that was done by JLCPCB. I just populated the controller board and then soldered the 6 PCBs to form the cube.
Next time I would go with 1mm oder even less thickness for the PCB...1.6mm is quite chonky.
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This happens when you sit next to @tinyledmatrix on a train to #hackadayberlin2024.
The cube uses 320 1.6mm RGB LEDs on a 2mm grid. All sides are connected by solder joints to connect the LEDs in one continous chain. A sixth PCB sits in the middle of the cube holding the microcontroller and USB-C socket.
Now I have to do some work on the firmware to make it display more interesting patterns...
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Our booth is ready for #makerfairehannover tomorrow! Visit @gigabecquerel and me at booth 133 if you want to learn about radiation detectors, colorful glass and magnetic alloys made from non-magnetic metals.
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The forbidden bean juice!
(It's a saturated solution of Ammonium iron(III) sulfate for growing crystals. They should be paramagnetic.)
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Behind the scenes view of my very professional setup...
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If you like strange magnetic substances, you might be interested in Gadolinium doped phosphate glass!
https://chaos.social/@stdlogicvector/110649927115546029
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I'm going to clean up the chunk of alloy. Just wanted to show that it works directly from the furnace, without any further processing.
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This almost feels like magic. A ferromagnetic alloy made from to non-magnetic metals!
"Bismanol" is an alloy of Bismuth and Manganese, developed in the 1950s by the Naval Ordnance Lab (as hinted to by the -nol in the name).
To make it, I melted 32.9g of Bi and then added 7.0g of Mn to the melt. The mixture was heated to ~800°C and then poured into a mold.
The ratio or the quenching might not be optimal to reach maximum magnetism, but I am pretty pleased with the result.
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Super cool, mate!
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I cooled a cube of Gadolinium to below its Curie temperature of 20°C. At this temperature the metal changes from being paramagnetic to ferromagnetic (or helically antiferromagnetic, whatever that means exactly). This makes it much more attracted to a magnet and it jumps up!
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Here's another one, this time with the really bright flash at the end.
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