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Gold Foil From Powder (Patreon)

Published:
2018-05-02 00:01:18
Imported:
2021-10

Content

think this is good or should I re-do it? the white balance was all off, silly me for thinking natural sunlight would be a good idea. lol

Files

Turning Gold Powder to Foil Without Melting

I hammer and roll some pure gold powder until it cold (warm?) welds into a sheet. Help me make videos by donating here: https://www.patreon.com/CodysLab Follow me on Facebook: https://www.facebook.com/codydonreeder SubReddit: https://www.reddit.com/r/codyslab/

Comments

Anonymous

Very nice idea and well done as always! Since I saw that there is a lot of gold dust on the pavemente and on the rollers, I was wondering, how much gold powder have you lost making this video? Can this process be used with osmium and other metals that don't react with oxigen very easily?

Anonymous

Well, it an interstering theory on converting gold powder into metal with mild heat and force. I am supprised it worked in the first place. I learned something new. Man gold powder must have been quite expensive right Cody? 1 g of AuCl3 1 percent can easily be 100 dollars on ebay.

Anonymous

Personally I'd take out the hard cuts before posting it. The video seems to be ending without any transitions, but then just keeps going! Regardless, loved the video! Really appriciated the work hardening explanation. That was really straightforward and logical!

Adric Menning

more classically to make really thin gold they would put it between sheets of leather and beat them here is a link to a interesting throwback video. makes me wonder are there still people doing this much? its a great way to stretch your dollar! <a href="https://youtu.be/2Lak64SAaIY" rel="nofollow noopener" target="_blank">https://youtu.be/2Lak64SAaIY</a>

Anonymous

The white balance isn't that much of an issue in terms of watchability. The hard cuts are disorienting, though.

CodysLab
>>12002584

Ah, I was trying to show that time had passed. I’ll work on it in the future.

Anonymous

What about gold or lead, silver, sodium, lithium foil airplane or simple origami. Making such thin foils of metal opens a lot of possibilities

Anonymous

Hi Cody! Wow, an amazing experiment in this video, I have a lot to say since we talked about this in some of my materials engineering classes. The bubbles were almost certainly trapped air, as there is typically a lot of empty volume between the particles in a powder. You probably know this as well, but the ideal packing for spheres still has only like 74% solid volume, so I would think 30-50% of your powder bulk volume is air, especially with the clumps. And the small size of the particles means the edges can seal solid before all the air escapes from the middle, which I think is why the center hole in the foil didn’t help. This video also reminded me of the sintering process (which I guess you have probably heard of as well), where powder is compacted into a shape with a die and then heated (also like you did!); surface energy reduction drives diffusion to fill in the holes over time. Very often used to make ceramics because of their high melting points, sometimes used to make metal parts for various reasons, and I believe this mechanism happens when sediment turns into sedimentary rocks (although you would know more about this than I do : ) And speaking of high melting points, sintering was the first used (and still currently used, as far as I know) method to produce high-purity, ductile tungsten for lightbulb filaments, so I can certainly see it being used for platinum. Noble metals have that extra advantage you pointed out, in that pressure can but cold weld particles as well as force them together – I still find that so weird and wonderful! But even in non-noble metals, good compaction is very important to consolidate the starting powder, since a little bit better compaction can save a lot of time in sintering (it’s pretty slow on its own, without hammering). So for further experiments, might I recommend: compressing several powder pellets, hammering them flatter while hot, then ‘cold’ welding (non-melted, could be at red heat) the pellets together on the flat surfaces, and processing THAT into foil or whatever else you want. The pill punch gives nowhere for the powder to go, so it’s a good way to get high and relatively even pressure, but the bulk of the air can still escape. The hot hammering does ‘cold’ (non-melted) welding and annealing at the same time, which saves a step and probably gets the air out better (softens the metal and increases diffusion coefficient). Welding multiple pellets together mainly just increases the size of the piece, but might also let you use higher pressure or temperature to get better compaction in each pellet than by doing the whole powder batch at once. For this a flat (or ideally somewhat convex), smooth, and clean surface would help make a good joint. I also noticed a bit of rust on your anvil that seemed to get onto the gold, which could become inclusions when it is folded over, and hurt the purity. That reminds me of wrought iron blooms, except in those molten slag fills the pore volume instead of air. Similar idea of beating it while hot to consolidate everything though. Although all the difficulties of solid-state welding and sintering made me think about melting again! If high-quality powder is melted in a clean graphite crucible and cast in clean graphite (ingot mold or crucible), I don’t see much reason why it would be less pure than sintered. Maybe you could try both methods (melt or weld/sinter) with the same starting power, and have all three materials analyzed to see what the purity is like? Sintering also tends to usually leave some little bit (~5%) of porosity, unless you heat really close to the melting point. So you could also cut the resulting gold in half, polish it, and look for voids under a microscope. About the platinum, it may be too difficult to melt with a common MAP torch, but oxyacetylene or oxyhydrogen (or pretty much any hydrocarbon with oxygen) should melt it just fine. Might only be able to do a small bead at a time, in which case you’re back to hammering and solid welding them, which would again need a smooth, clean hammer and anvil to get the best purity, but worth thinking about. Well, that turned into a massive wall of text. I figure you know most of this stuff as well as I do, but I just wanted to share my thoughts, I think all this stuff is so cool and it’s so fun to talk about it! Hope I don’t overwhelm you with it all.

Greg

This video is where I first heard of annealing, and kick started a metal forming renaissance : <a href="https://youtu.be/WHKNkcVZvN8?t=1m21s" rel="nofollow noopener" target="_blank">https://youtu.be/WHKNkcVZvN8?t=1m21s</a>

Anonymous

The colour temperature and white balance doesn't seem too bad. The only issue seems to be a bit too much contrast with too little brightness or perhaps too high gamma. The white balance is actually less of an issue than trying to use LED or other fluorescent lightening. The RGB colour space is messed up enough as it is; trying to film something with spectral holes in your illuminant just never ends well. I would vote for exclusively using tungsten lamps and sunlight for illumination and then just setting the colour temperature so that it looks similar to what your eyes are seeing.

Zorn

If you put the gold powder in a strong (hydraulic) press, or just in a cylinder with a thread and continuously press down on it and heat it up a bit, would that be an easy way to make a gold chunk? (and/or ingot, if you made a mold to shape it right when compressing it)

Anonymous

Don't worry about the white balance. In film making in general, the audience will forgive a multitude of sins in image quality, but has much less tolerance for problems in sound.

Anonymous

for the next part in the precious metal refining you should try recovering the thin layer of gold that stained the top of your anvil.

Silviu T

TBH it isn't the resolution of the image or the white balance that keeps me subscribed. It's the content.