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Homemade boiler,fire chamber panels cracking??

Post in 'The Boiler Room - Wood Boilers and Furnaces' started by ozzie88, Nov 8, 2012.

  1. ozzie88

    ozzie88 Member

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    I built this up-draft gasser. boiler and all in all it works great, But, the panels i have to seperate the chambers only last about 4-6months? I tried cordierite 3/4thick and corelite 1inch thick, both cracked?? I been told from the color on them it runs 1700* to 2000* they are 12x16inch and 14x16inch in size. I am thinking of just putting steel or stainless but this would melt or break down,right?
    I read about Silcon carbide but cost alot and did not seen to have good specs? Any ideas of what to use?
    The piece you see red is part of chamber[choker] The flame is almost clear it so hot, I think it just gets to hot in there,i get a bluesh purple type flame or clear most of time,i tried to adj. air and cooled fire off but?

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  2. Nofossil

    Nofossil Moderator Emeritus

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    I've had much the same problem with materials in the secondary chamber. It's a remarkably hostile environment - high temperatures, extraordinary temperature gradients, nasty chemistry, rapid temperature changes. I've turned a lot of expensive materials into gravel.

    The only thing I've found that holds up for any length of time is 3000 degree rated high density / high alumina firebrick. I buy them as 'splits' - half thickness.

    There HAS to be castable ceramic that will hold up, but I haven't found any.
  3. ozzie88

    ozzie88 Member

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    Well, I have not found anything to hold up,so,this week it time to get steel or stainless plate,least it wont crack,might melt but we will see how long it holds up. About 1/2inch thick I think or more if I can lift it? Darn boiler just works so good I just hate to keep messing with these plates. I,ll weld some cross pieces for to keep them flat, rest of fire chamber is 2 1/2inch, fire brick which holds up good so far,
  4. laynes69

    laynes69 Minister of Fire

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    The material in our baffle on our woodfurnace is c-cast, capable of temperatures up to 3000 degrees. I guess it's a material that was used for space shuttles or something on that order. Maybe there's an option there, our baffle is about an inch or slightly thicker. I know it's lightweight, but durable.
  5. ozzie88

    ozzie88 Member

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    Is there any way to get this itom? or find the cost? pieces need to be 12 1/2inch x 16inch for bottom and 14inch x 16 for top piece. thickness can be I say up to 1 1/4 for bottom and 1 1/2 for top. Who would be able to sell this? if you may know? Thanks alot!
  6. laynes69

    laynes69 Minister of Fire

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    Stove Builder International or SBI built our furnace. You might want to contact Fyrebug on here and see if he can give you any leads and maybe some more info on the material. Its a ceramic cast material with high heat properties, that's about all I know. Sounds like it might be what your looking for. Good luck!
  7. ozzie88

    ozzie88 Member

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    Thanks, it does sound like what may work
  8. jebatty

    jebatty Minister of Fire

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  9. Nofossil

    Nofossil Moderator Emeritus

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    Might help to use several small pieces rather than one large. The temperature gradient between the center of flame impingement and the edges can be truly extraordinary.

    Of course, my experience is that if you start with one large piece, you end up with several small ones anyway :-O
  10. ozzie88

    ozzie88 Member

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    This c-cast is the right stuff to use. I just talk with the guy even those other materals wont hold up do to the gases in the 2nd. chamber fires,but this will. He is getting me some, sounds great http://www.rsifibre.com/products/c-cast.php Thanks guys, this guy said out of 700,000 they only had 200 failed after years.of testing,,

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