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Thread: My Hartman Electric Furnace

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    Supporting Member rgsparber's Avatar
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    My Hartman Electric Furnace

    Back around 2002, Dan Hartman masterfully updated the 1984 electric furnace designed by David Gingery. In 2008, I stood on Dan's shoulders and attempted to improve on his design. Here is the result which has served me well.

    If you are interested, please see

    https://rick.sparber.org/modified%20...%20furnace.pdf


    Your comments are welcome. All of us are smarter than any one of us.


    Thanks,

    Rick

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    Rick

  2. The Following 12 Users Say Thank You to rgsparber For This Useful Post:

    baja (Jul 16, 2020), Carnel (Jul 15, 2020), dubbby (Jul 15, 2020), hemmjo (Jun 6, 2023), Jon (Jul 16, 2020), madmick77 (Jul 15, 2020), NortonDommi (Jul 15, 2020), Saltfever (Jul 16, 2020), Sleykin (Jul 14, 2020), Tackweld (Jul 17, 2020), Tonyg (Jul 20, 2020), will52100 (Jul 14, 2020)

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    Thanks rgsparber! We've added your Electric Furnace to our Heating and Cooling category,
    as well as to your builder page: rgsparber's Homemade Tools. Your receipt:




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    Thanks Rick,
    I love your PDFs. Have you ever looked a foamed cement? One day if people ever stop bothering me I need to build a furnace and I have seen a few people using foamed cement sealed with Waterglass as the insulator with very good results. I like the fact that it is easy to work with and castable.
    Here is a link to a foam generator that works well: http://pelagic.wavyhill.xsmail.com/

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    Supporting Member rgsparber's Avatar
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    Quote Originally Posted by NortonDommi View Post
    Thanks Rick,
    I love your PDFs. Have you ever looked a foamed cement? One day if people ever stop bothering me I need to build a furnace and I have seen a few people using foamed cement sealed with Waterglass as the insulator with very good results. I like the fact that it is easy to work with and castable.
    Here is a link to a foam generator that works well: http://pelagic.wavyhill.xsmail.com/
    I don't have any background in cement but the paper is certainly interesting. I couldn't find a date so wonder when it was written and how have samples fared over time.

    I know that mixing high temperature cement and perlite is a common procedure when making furnaces. It would have a similar outcome.

    Thanks,

    Rick
    Rick

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    Supporting Member hemmjo's Avatar
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    Quote Originally Posted by NortonDommi View Post
    ...Have you ever looked a foamed cement? snip... http://pelagic.wavyhill.xsmail.com/
    I have looked at foamed cement for use in raised bed planters. It my research says it is not very durable. I also know that Portland cement is not very heat resistant at the temperatures you may want in a furnace. At 1500˚F portland begins dehydrate. Hydration is the process that causes the cement solidify and to bind to the materials in concrete. Any prolonged temperatures about 1500˚ will destroy the cement.

    I have this link bookmarked for when I get around to building a foundry furnace.

    I ask have an old ceramic kiln, that I recovered from the trash, stored alone with my other "will get to it someday" stuff. It has lots of that soft fire brick heating elements and a nice stainless steel exterior that will be easy to reconfigure to a crucible furnace.

    John

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    Quote Originally Posted by NortonDommi View Post
    Thanks Rick,
    I love your PDFs. Have you ever looked a foamed cement? One day if people ever stop bothering me I need to build a furnace and I have seen a few people using foamed cement sealed with Waterglass as the insulator with very good results. I like the fact that it is easy to work with and castable.
    Here is a link to a foam generator that works well: http://pelagic.wavyhill.xsmail.com/
    This sounds a lot like the RAAC concrete (currently starring in a huge scandal in Britain) https://en.wikipedia.org/wiki/Reinfo...rated_concrete



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