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Matthew Schneider

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Everything posted by Matthew Schneider

  1. Can anyone suggest a high quality digital thermometer that's been accurate and reliable? Amazon has so much crap with fake reviews, I'd rather that come for one of you that's actually used one that works accurately. Going to be used to guage crucible steel temperature, so one that reads up to steels melting point hopefully.
  2. Never mind, that's definitely hot enough now! Removed the upper bricks and I have far better control of it now. Changed the tuyeres a little so there's more space between them and the crucible and hot damn it's !!!HOT!!! HOPEFULLY I've got a beautiful ingot in the morning that I can forge at least as 'easy' as my first. Recipe is just a bit different this time.
  3. It's forging out nicely, had time ti get it to somewhat blade shaped yesterday, I'll finish this today then I've got another crucible charged with 4x more material so hopefully that turns out even better! Next time I'm paying better attention to where the top of the ingot ends up, I didn't plan on it being the face of my blade...next time, all learning process
  4. I did 13 heat cycles to soften it and decarb the surface. Did some light forging, no cracking and it's not super hard so it's looking positive so far. Tomorrow I'll be forging it out, can't wait to see how it turns out!
  5. After several attempts, each ending in an ingot thst didn't fully melt last night I finally got one that did. It's small 155 grams but it's my first success and I'm really excited about it. I melted this one in my forge, crucible suspended above my clinker breaker with tongs, piled up coal around it. Took about an hour to reach moltel though I probably got there sooner. Slowly ramped the blast down over half an hour and left it to cool till black. Structure looks good and it's not sparking as cast iron thankfully. Going to thermal cycle this today and attempt forging...gently. Pray my luck c
  6. So I made a furnace to do sone crucible steel melts, I've ran it twice but both times didn't get a full melt. The crucible is on a pedestal, the tuyeres are pointed at a downward angle, one at the base and the other slightly higher on the other side. they are ofset a bit so the airflow moves all around thw crucible. Both times I slowly heated it till crucible and everything we're glowing orange then turned up the blast and ran it like that for 1 1/2-2 hours. I've forge welded and melted iron bars in my forge with the same coal. First time I tried a mix of bituminous and charcoal, tended t
  7. Something I've been curious about is if the various kinds of patterning in crucible steel are better performing than others. Everyone seems to prefer the "watered" pattern that looks similar to a high layer count pattern welded, large banding. I personally find the very fine almost net-like structure (like the third and fourth pictures) more appealing, it seems to have more depth to it to my eye. Though every one I've seen is a beautiful thing no doubt. I don't know if anyone has actually put this to the test or not, the only video testing a crucible steel blade was a Very fine patterned
  8. I've got the materials to try Vasily's recipe and one of the others listed , just lacking the graphite but I ordered a pound to give it a try. I'll report how it works after my furnace is built. Bricks covered in ITC 100-HT and drying overnight, tuyers molded and drying. Should be able to mirtar my bricks together and ram a coat of refractory around them. Hopefully by early next week everything will be dry and ready to go
  9. You definitely have a greater knowledge on the subject than I do. Thank yoy very much fir your time!
  10. Huh very interesting indeed! Thank you so much for sharing your knowledge#! I see coke graphite for sale by the truckload basically but not just a few pounds. I do have some very high temperature resistant material called "Mulcoa mullite grog" 60% alumina I believe. It's actually good to know the clay is supposed to be mire if a binder for materials like this than the actual body of the crucible. That changes things for sure, good to know! I don't have graphite but powdered it is actually pretty cheap, most of the ingredients are really, I figure if I make small crucibles to test my mate
  11. Yeah I'm sure they were knowledgeable in their craft as any other. If I could find a mix of matetials maybe even with some local clay as part of it last one melt I'd definitely be pleased with that. One of the clays I found locally is incredibly hard and strong even unfired. Doesn't mean it'll survive the temperature but it's at least a starting place. I'll probably be trying some really small crucibles as tests in the forge to see if the mix will work.
  12. WOW!! That's pretty damg awesome of you! What is graphatized coke though? It's a shame we don't have the recipe for the crucibles they used to produce hundreds of thousands of pucks 1000 years ago. My guess is their knowledge of ceramics isn't what it is now involving complex chemical interactions. They found a mix that worked and produced huge amounts of the sterl with it. Thank you fir sharing McKinnon!!
  13. I've got 100-HT coming via usps, delay delay delay. They used to be so dang reliable but 3 day priority mail is now at least a week...lame. I mixed up a few things and gave it a coat of something else. Going to test it later. I've heard the kaoline is working well several times now, it's cheap too. I'll probably give it a try with high alumina. I'll talk to some potters as well, maybe visit the ceramics teacher and pick his brain. Our ancestors made reliable crucibles, I know we can too
  14. Bummer ok, thanks for letting me know. Still curious if anyone tried a design like this.
  15. Might change this a little for myself, like making the bottom removable to clear ant slag. Maybe a tray lined with siluca sand so it's easy to just dig some out. I wouldn't think the very bottom would turn molten or am I underestimating here? Maybe mixed with some water glass? I'm drawing something now, castable refractory and fiber blanket comes tomorrow as long as FedEx isn't a screw-up -Again-
  16. That is a REALLY awesome design! I might just change my plans at the last minute to make one of these instead! Very cool! Any video of it running?
  17. If it survives one nekt I'd be happy. Would you share your recipe?
  18. I've got mullite tomorrow, would the really high ceramic coating like 100-HT help prevent the inside being degraded at high temperature? It says specifically it for " refractory erosion due to slags and fluxes" I've got some of that coming tomorrow also. The refractory I bought also said it is one of the most resistant to slag and flux.
  19. I get that but it was made successfully by our ancestors with not nearly the ease of ability to materials we have. I'm sure our modern refractories are quite superior as well. I'm going to experiment with what I can get, just hoping to get a bit of direction from ones who have actually done it.
  20. Yeah after posting this I actually saw that. Going to test out what I have this coming week. I'd like to make like egg sized crucibles to test out how various additions would come out in larger pucks. That and hand forging one that size is a hell of a lot easier
  21. So this subject I've had not much luck getting any straight answers. Even called a refractory company today and they couldn't tell ne if any of their materials could be used to make them. SO I'm going to list the available refractories and hopefully someone is more knowledgeable than I to see if it's possible to make my own from any combination of what I can get not far from where I live. One of the things I believe I've read the traditional(I think) crucibles we're made from is MULLITE. Ive seen bricks made from it that were the highest temp rated I've seen. Here's the list:
  22. Just read through this, great stuff! However I can't see many photos at all, every time someone says there is attached photos either the link doesn't work or there just no photo at all. Is it because this is an old thread? Also could anyone send me a better picture of the furnace talked about in this thread? It says the crucibles are placed on top of a firebrick on the bottom but is this on top of your firepot or is it a sideblast Forge? I set up some firebrick around my firepot to try this but I'll just have to keep lifting rhe crucible as it sinks closer to the clinker breaker.
  23. Yeah I was thinking of trying just that perhaps in my forge. We've got clay locally that was used to make pottery but I'm not sure what it is exactly. I've heard about the acid/oxide destroying some clays at temperature. There's several that specifically say are very resistant to that. I've been looking at several but none have said they'll work to make crucibles.
  24. Thanks! Yeah there has to be a way to make our own crucibles way cheaper than buying them, even if they are single use and the material is incorporated into other new crucibles. There's several modern refractory clays/plastic moldable ceramics that will take 3000° I've considered: "Blue ram" "super hybond" "mizzuo castable plus" etc. but I don't have enough experience to know what will work and what wont.
  25. Forgot to ask, when doing a sealed crucible do you folks add a little aluminum to it before sealing? If not what's the best way to avoid porosity?
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