I have designed and built Thyristor Resonating Induction Melters. Thyristors are the work horses of high power induction heaters. Honestly speaking I said Congrats! to you because you did a great job i.e. you succeeded in making that refractory crucible, and lifted it full of molten steel . Back in 2007 I searched every where on the internet and never found a crucible like yours. I purchased many alumina crucibles from China that collapsed at white heats . I am planning to post my videos about my SCR (Thyristor) Series Resonant Inverter with which I was able to melt 40 kgs of brass and copper in a large graphite crucible, but only 20kgs of steel.

@carneeki

3 жыл бұрын

Looking forward to seeing that build, that sounds impressive!

@knowldedge5012

2 жыл бұрын

Hi, I was looking to make an induction melter like that but I am not so good at electronical stuff, however I understand how it works in principle, do you have any plans for the furnace?

The metal used is cast iron. You can see it after the spark and the temperature is not well appreciated according to the data. However, we have all the respect for you.

My prayers go out to the copper tubes for courageously facing the extreme heat which even the steal couldn't bear.. the true unsung hero..😄

Congrats ! But whats the life cycle i.e. how many melts it can handle before collapse? A much more safe procedure is to include the whole coil in a tilting container and press the refractories for the crucible inside the coil . So I would be very careful trusting when lifting that crucible.

Steel will alloy with carbon on graphite crucible to be very hard steel. How to prevent this?

Very cool

Hi Carlos, that looks really nice. I am an enthusiast, and I was looking to do something very similar with steel at home (simple and straight fwd process to melt metals) when I bumped into your video :) How did you create that crucible? Is it ferrous or regular graphite-clay one? If so, how did the steel melt (coz it seems to go beyond curie temperature)? Awesome work btw

@ihtsarl9115

3 жыл бұрын

they press the refractory powders inside a steel or stainless mould, and place the whole thing in a temperature controlled oven and increase the temperature very slowly (really slowly like 5 degrees every half hour or so) till white hot temperatures (1300-1500 C) and wait at white hot temperatures allowing the molecules of different additives to coallse or join together almost crystallize and thus harden and then after this preset annealing time let it cool slowly.

@ihtsarl9115

3 жыл бұрын

Graphite crucibles start deteriorating above 1150 C according to my experience.

How steel melt??? wht about curie temp?? When its abov the curier temp its gonna lose its magnetics properties right?

Wow, just incredible dood! good to se another induction melter and one that works so very very well!, what induction system are you using? I am keen to build a tilting crucible and would love any info you might have on flexible links between the heater and coil? all the best oh and my channel has a host of diy induction heater vids if you fancy a laugh! cheers tanc

@ihtsarl9115

3 жыл бұрын

we use car battery charging cable to transfer electric high currents to the induction coil. Car battery cables that are really thick and made of strands of hair size wires that's the best and they wont heat too mush

Would you be able to share the crucible making process details ? What is the balance 1.5% (others) consist of. Thanks for sharing so much anyway.

@ihtsarl9115

3 жыл бұрын

see my reply to Manu Patet, and I think the balance is magnesite . I would be interested if you share with me your interests . I am Nick jaber

@diptree

3 жыл бұрын

@@ihtsarl9115 We are trying to put together small steel melting furnaces for recycling of scraps, aimed at the makerspace domain. www.cookee.org/melt-IT.html A good crucible that has resistance to slags would be important. Hence our interest in your work. Currently we are using clay-graphite and silicon-carbide crucibles. Thanks for your prompt response !

@ihtsarl9115

3 жыл бұрын

@@diptree graphite is carbon and at very high temperatures it oxidizes with oxygen and deteriorates. What's needed are refractories that stay stable up to temperatures of 1800 C -2000C such as Alumina, Magnesite (MgO) there are special powder mixes for steel melting . Mr Carlos Larrazabal's crucible displayed in this video looks good but the question is : how many melt (cooling-heating ) cycles will it survive before collapse? thats why I asked him. The general trend in steel melting industry according to my experience, and especially for induction heating melting is to make a crucible fixed inside the induction coil and the whole thing placed inside an Outer holding box namely a refractory box holding the coil& its Inner Crucible thats how we did it and melted steel inside them. We did 20kg with the oven i developed. In industry they melt tons of steel that way. This way if the inner crucible (containing dangerous molten steel ) fails and leaks sideways or at the bottom the molten steel will stay and solidify in the outer protective box therefore better safety especially when dealing with large melt quantities.

@ihtsarl9115

3 жыл бұрын

I asked my partner whio is a metallurgist engineer and he said back in 2009 we used mainly magnesite for pressing powders but I think now Carlos is using as balance not magnesite but some low quantity of powders that have very low thermal expansion characteristics which means at higg temperatures it keeps the crucible from expaning too much or contracting too much . You can search on the internet for refractories with lowest thermal expansion coefficient . The main point is for small melts a small crucibe is not a big problem if it leaks But for large melts crucible are dangerous

@Kyle-sg4rm

3 жыл бұрын

Ashes from certain plant sources could be considered a fair source of materials. Aluminium oxide, Magnesium carbonate & oxide, and Silica (if desired). A bit of processing involved, such as removing mostly Potassium salts, Calcium carbonate/oxide and other processes... And then I suppose it could be molded and heated slowly until extremely hot and used as a crucible. Could be an interesting experiment. Just a small one to start with.

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