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Tube Furnace Fabrication

  1. Feb 17, 2009 #1
    Hi All:

    I plan on producing a laboratory tube furnace capable of = to or > 1300 C. Does anyone have any experience working with materials designed for these temps?

    I have been pricing Mullite tubes: 500 mm L; ~34 ID; ~40mm OD, 18 G Kanthal A-1 wire (to be wrapped around the tube), Kaowool insulation blanket, and a piece of 'stove pipe' to be the outer tube.

    Right now I have two questions:

    1) Any suggestions as to the above components? By that I mean suggestions, as to better (in terms of quality and ability to take temperature), grades/types?

    2) I need to purchase a thermocouple and thermometer. Recommendations? I also need to design a circuit to adjust power to the wire. What would you guys do and how would you arrange it? I was thinking some sort of dimmer switch (have to handle 2000W power @ 230V) parallel with a bulb as indicator?

    Bear with me... When I get it going I'll make a how-to thread with pictures.

    Thanks in advance
  2. jcsd
  3. Feb 25, 2009 #2

    I have located two Mullite tubes; one @ 83.00 and one @ 86.00

    Kanthal A-1 Wire @ 15.00-20.00

    ITC 100 HT ceramic paste @ 38.00

    Kaowool 1" 2600F 2 ft2 @ 13.50

    Variac (for temp control) ebay searching ~100.00

    Stove pipe... 10.00-15.00

    Thermocouple and thermometer with the TP 04 thermocouple 89.99 http://cgi.ebay.ca/ws/eBayISAPI.dll?ViewItem&item=260359668034&ssPageName=ADME:X:RTQ:CA:1123 [Broken]

    Quartz glass test tube (with ground glass joint) for use inside furnace... ~100.00

    I need to find a glassblower, I assume.

    Suggestions/Thoughts? This is looking like a 500.00 project...
    Last edited by a moderator: May 4, 2017
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