Craig Dunn Clark on wed 5 nov 03
will sodium silicate act as high temp adhesive?
Lisa, you might try using either pc7 or pc11 epoxy. Both work well.
Alternatively, and I'm not sure whether or not this will work, you could try
using sodium silicate as an adhesive in a low temp refire. If memory serves
me correctly I did have some success with using sodium silicate as a high
temp adhesive on a few pieces a number of years ago. I also use it as an
adhesive for kaowool blanket when building a fiber kiln. Not really sure as
to how it works though.
Hope this helps
Craig Dunn Clark
619 East 11 1/2 st
Houston, Texas 77008
(713)861-2083
mudman@hal-pc.org
----- Original Message -----
From: "Fredrick Paget"
To:
Sent: Wednesday, November 05, 2003 12:54 AM
Subject: Re: Gluing with glaze?
> >Hi,
> >I just broke the handle off of my favorite goose bowl by Stephen
> >Schiffer (http://www.villagecraftsmen.com/schiffer.htm). I was
> >wondering if I could "glue" it back on with my low fire glaze even
> >though this is stoneware. It has worked before on my low fire pieces.
> >Others have said to just use super glue. Thanks for any suggestions,
> >Lisa
>
>
> We just tried this with a piece in the Tozan firing and it didn't
> work. She tried to glue back the foot of a tall vase and hold it in
> place with wadding but the vase fell over and off the shelf onto the
> floor of the dogi and was a total loss.
> Problem is the glaze has no strength while melted and might even be
slippery.
> You would have to find a way to support the handle in place. I don't
> know how you could do that.
>
>
> Fred, just back from a very good firing of the Mighty Tozan
> Noborigama in B.C.,Canada. Beautiful glaze development. It was a
> very hot firing. Cone 12 flat and melted.
>
>
> --
> From Fred Paget, Marin County, California, USA
> fredrick@well.com
>
>
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iandol on fri 7 nov 03
Dear Craig Dunn Clark,
You ask <>
Short answer, "Yes".
The next question is "Which one will you choose". Sodium Meta-silicate =
(Na2O.SiO2) has a melting point of 1089 deg C. Sodium Di-silicate =
(Na2O.2SiO2) an MP of 874 deg C . Choice determines firing temperature.
But remember that liquid Sodium Silicates contains water which has to be =
evaporated and that the pot in question will need to be set in such a =
way that the parts do not separate, meaning they must remain in contact =
under the influence of gravity during the period of heating and cooling =
to prevent any movement. This might be a problem.
I think a lot of experimental trials would be needed but the temperature =
to which the ceramic might be heated could be well below the original =
firing temperature. Another problem might be the activation of Quartz or =
Cristobalite phase changes which could destroy the subject.
I would be cautious before using this on a precious object. "If in =
doubt, don't...."
Best regards,
Ivor Lewis. Redhill, South Australia.
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