Results 1 to 7 of 7

Thread: Lost Wax Casting Investment Powder Questions (for Aluminum)

  1. #1

    Lost Wax Casting Investment Powder Questions (for Aluminum)

    I'm looking to cast some small pieces in aluminum using a lost wax casting method. I will utilize a vacuum for the investment, before and after pouring into the flask, and a kiln for the burnout and curing. Does anyone have any advice on which investment powder (Kerr, R & R, or others) would work best for this process with respect to surface finish?

    I'm looking at Kerr Satin 20 or Glass-Cast 910 or any other readily available powders. I understand Kerr makes a G-400 investment powder for aluminum, but I do not see it available in smaller quantities, 50 lbs or less, anywhere on the internet. Are any of the other Kerr or Ransom and Randolph investments other than Satin 20 or Glass-cast 910 better for aluminum?

    I read on this forum that R&R's Glass-Cast 910 is the same as their 910 Investment and that they just started marketing the 910 Investment in smaller quantities as Glass-Cast 910 for glass casting because they were getting requests from glass casters for the 910 Investment in smaller quantities. See Link:http://www.alloyavenue.com/vb/showth...ght=glass-cast ("the 910 on the glass site is the exact same stuff they are selling on the main remet side for solid casting brass/bronze."). However, this statement was 7-years ago. Does anyone know if this is accurate? When I contacted R&R about using Glass-Cast 910 for aluminum, I was directed to the info sheet for the 910 Investment and was told that it was formulated for non-ferrous metals, while Glass-Cast 910 was formulated for glass. See links:

    http://www.ransom-randolph.com/PDFs/...structions.pdf

    http://www.glass-cast.com/application-instructions.html

    Also, regardless of whether these two products are different formulations, has anyone had any success using Glass-Cast 910 for aluminum lost wax casting?

    Finally, has anyone here used Chem Bond 4905 binder (see link below) to make a sand mold/investment around a wax mold and used it in a lost wax casting process? Is it similar to Lino-Cure?

    http://shop.clay-planet.com/chembond...on-bucket.aspx

    Thanks.

  2. #2
    Member
    Join Date
    May 2017
    Location
    North side of the "Wall", USA
    Posts
    77
    Jagboy sent me this video a couple days ago.

    If it works for bronze it'll damn sure work for aluminum.

    This guy is Seriously skilled & talented.
    Plug & mold making starts @ the 2:41 mark.
    https://www.youtube.com/watch?v=SNYwSEDp_1E

  3. #3
    Great video. I enjoyed watching it, so thank you for sharing the link. However, it shows what appears to be a ceramic shell process, which I'm not equipped to do and is beyond my skill level and commitment.

  4. #4
    Moderator DavidF's Avatar
    Join Date
    Jan 2012
    Location
    Wilmington DE
    Posts
    2,425
    I use the R&R ultravest for aluminum and it works out just fine with vacuum assist. The 400 series is a bit more porous but I dont think it would make any difference unless you are gravity casting.
    Keep the flask under vacuum for several minutes before removing and quenching as the aluminum is slow to cool in the flask. Also pour at the lowest flask temp possible.
    The chem bond binder will break down during the burn out process, so that's a no go.
    A calm sea does not make a skilled sailor....

  5. #5
    David,

    Thank you for the feedback (and your youtube video on making a vacuum assist vacuum chamber). Very helpful.

    Do you have any tips for the time and temps for the burnout and curing for R&R ultravest?

  6. #6
    Moderator DavidF's Avatar
    Join Date
    Jan 2012
    Location
    Wilmington DE
    Posts
    2,425
    What size flask??
    The tech sheet will list the burn out schedule according to flask size. Casting flask temp is a whole different world, and low flask temps typically produce better finishes, but id casting very thin parts i would go higher.
    A calm sea does not make a skilled sailor....

  7. #7
    I found the tech sheet on their website and ordered a 25 lb box of Ultra-Vest from Esslinger.com and a 4" x 4" perforated casting flask from Gesswein.com, which I'm going to try to set up with a vacuum assist casting chamber as shown in your video. I'll see what happens and go from there. Thank you for your help.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •