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I Forge Iron


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About thijsvh

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  1. You are correct in a camp fire it is supposed to give lower heat than possible with a very slow flame, hardly any flame at. I've seen the same burners in domestic on demand water heaters producing 25 to 30 kW of heat. That is of course lower grade heat because it's used to heat water to a relatively low temperature. But 25 kW in an enclosed space like a forge is something different. I wouldn't use any metal parts on the hot side of things. It would still be a slow flame so I guess it still fails the criteria for a good forge burner... What about using it in a vertical foundry? It would be
  2. I was thinking to mount it something like this: Pretty sure it's the same type of ceramic plate they use in radiant heaters.
  3. I was thinking the same at first but when I turned it off and removed the plate the inside of the box was cool. After ten minutes running the box is still cold to the touch. Only the top edge is a little warm because some gas leaks around the plate and ignites there. Looks like it is designed to glow and give a lot of infrared radiation.
  4. I made a burner using a ceramic burner plate which are sold as ceramic soldering plates on eBay and Amazon. After a little research I'm pretty sure these are made from cordierite, and are used in portable camping heaters. Same material as in catalytic converters so it should be refractory and very thermal shock resistant. (mine came cracked in the mail...) Main body is made from gypsum but should be made from castable refractory of course. Added some stainless steel wool (the stuff to clean your pots) to even the airflow inside the burner body. The blower I used is a computer fan with a s
  5. The mold for the burner is a two part mold and for the crucible a simple one part mold. The casting time for the burner was around 10 to 20 seconds after which the wall thickness was between 2 - 3 millimeters. The crucible took about a minute to reach 1 centimeter thickness. If you wait too long before dumping out the slip and the part walls are too thick you can recycle it by blending it with some water and mixing it back in with the slip.
  6. Will make some pictures of my two plaster molds for you tomorrow. They are pretty easy to make, if you watch some Youtube videos about the subject it easy to understand the basics. There is a lot of information about refractories, ceramics, IR reflective coatings, etc to be found inside old patents. But it is a bit difficult to find what you are looking for because there are so many. In the patent below they are using zirconium silicate and tiny amount of sodium silicate and water. No veegum, bentone or molochite. Have seen others were they did use some additives but from what I remember
  7. Hello all, First post here to show some results of experimenting with the slip casting of aluminiumoxide (alumina). https://en.wikipedia.org/wiki/Slipcasting Got interested to make shapes with refractory oxides by the posts of MonkeyForge and Mellin although they were using zirconia and veegum/bentone and were forming the mass by hand. Zirconia is a little too expensive to mess around with so i went with alumina. Using a combination of digitalfire.com, wikipedia, google patents, google scholar I found a lot of info which I all read. But a lot of it was above what was achievable at ho
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