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High temperature heating element for 600DegC ( 1112DegF )

Discussion in 'Electronic Design' started by Rene Tschaggelar, Aug 21, 2007.

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  1. I should heat a gas stream with a non-magnetic
    heating element to a bit less than 600 Degrees
    Celsius (1112Fahrenheit) Best would be some
    resistive foil or wire that can be mounted in
    a 6mm diameter quarz tube. The power, a few 10
    Watts. The wire or foil should not evaporate
    into the gaz stream, thus the temperature spread
    should be low over the surface. Actually the
    surface temperture should be as low as possible.
    A few 10 degrees more at most.

    The application is for one-of.

  2. Thanks Spehro,
    The gaz, best would be air, but if oxidation
    became a problem then we might go to nitrogen.
    We use it as heat transport medium, to heat
    some solid that cannot be heated directly.

    Ni-chrome is an idea. I'll have a look whether
    we can get that. For a single layer coil with
    the return in the middle, the stiffness of the
    coilwire should be sufficient. Ni-chrome is even
    having an own oxide layer, meaning it won't
    oxidize in air.

  3. Rich Grise

    Rich Grise Guest

    OK, go ahead! ;-)

    I've seen red-hot nichrome that didn't evaporate. What the
    heck are you heating, Sulfuric Acid vapor? ;-)

  4. What kind of gas? Any reason you can't use a coil of nichrome wire?

    Best regards,
    Spehro Pefhany
  5. Tim Wescott

    Tim Wescott Guest

    You should be able to find candidate heating elements in your nearest
    toaster oven or even hair dryer. I'd sure be tempted to cruise on down to
    the local hardware store to see what was available.

    Tim Wescott
    Control systems and communications consulting

    Need to learn how to apply control theory in your embedded system?
    "Applied Control Theory for Embedded Systems" by Tim Wescott
  6. Perhaps it could be wrapped around a smaller quartz or ceramic tube so
    the return wire would be insulated.

    Your 600°C should be fine for long life in air with ordinary Nichrome,
    but there are less common (and more expensive) alloys such as Kanthal
    A1 that work well at higher temperatures such as 1100°C or more,
    however IIRC Kanthal is magnetic at lower temperatures.

    Best regards,
    Spehro Pefhany
  7. whit3rd

    whit3rd Guest

    The heater in a laser printer is a halogen lamp, which could be
    in one focus of an elliptical-cylinder reflector so as to evenly heat
    the other focus. Pack some dark medium into a quartz tube
    and run your gas through that to get it up to a uniform temperature.
  8. Rich Grise

    Rich Grise Guest


  9. Rich Grise

    Rich Grise Guest

    Heck, check thrift shops and garbage[SIC] sales. ;-)

  10. Used Nichrome is a lot more brittle and hard-to-work-with than new

    Best regards,
    Spehro Pefhany
  11. Thanks, but a halogen lamp is just not
    surviving too many hours.

  12. Thanks Rich,

    that is an interesting supplier. The nickel-chrom wire
    appears to be standard item. I'll have to spend some
    time figuring out the resisivity vs. temperature as well
    as the possible magnetic properties.

  13. Rich Grise

    Rich Grise Guest

    Here ya go!

  14. Ralph in NH

    Ralph in NH Guest

    My news server stinks, I had to go to google groups to read most of this
    While you're checking McMaster-Carr, they also carry thin ceramic tubes,
    which you could use for your return. Don't depend on wire having the same
    mechanical properties at operating temperature. I do this stuff every day,
    drop me an email Monday morning, I can probably give you the material you
    need - ralph dot naylor at eichenauerusa dot com Spehro's right about the
    Kanthal alloys, they're tough, but they're composed of iron, aluminum and
    silica. Come to think of it, nickel is ferromagnetic also. I've never
    checked any of our wire for magnetic properties, it's never been an issue.
    Something to do Monday, I guess. Does the wire have to be non-magnetic at
    room temperature, or only at operating temperature?

    Best regards,

    Ralph in NH
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