John Stromnes on thu 3 jan 02
I'm making an underglaze pigment (gosu).Instructions say to calcine cobalt
and other materials to 1700 C in a crucible. I have kaolin, ball clay, AP
Green clay, alumna, kyanite, bentonite, etc., on hand, but no porcelain or
'crucible' clay. Does anybody have a recipe to share for a 'crucible' body,
which I assume means a very high fire body. It doesn't have to be too
plastic, since I could hump-mold a 'crucibowl' easily enough, I think.
Thanks, John Stromnes, Polson MT
Michael C Hill on fri 4 jan 02
Crucible clay
alumina hyd 45
ball clay 25
epk 20
wollastonite 3
ione grog 420 8
bentonite 1
g-grog 4
this formula can be thrown, have used it to make curcibles for free
standing pot furnace as well as invested pots. fire it to cone 11 or 12
if possible before using as your crucible.
----- Original Message -----
From: John Stromnes
Date: Thursday, January 3, 2002 5:07 pm
Subject: crucible body recipe
> I'm making an underglaze pigment (gosu).Instructions say to
> calcine cobalt
> and other materials to 1700 C in a crucible. I have kaolin, ball
> clay, AP
> Green clay, alumna, kyanite, bentonite, etc., on hand, but no
> porcelain or
> 'crucible' clay. Does anybody have a recipe to share for a
> 'crucible' body,
> which I assume means a very high fire body. It doesn't have to be too
> plastic, since I could hump-mold a 'crucibowl' easily enough, I think.
> Thanks, John Stromnes, Polson MT
>
>
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> Send postings to clayart@lsv.ceramics.org
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Dewitt on sat 5 jan 02
1700 C seems a little toasty for calcining. Hamer and Hamer gives 700 C
(1292 F) as a typical calcine temperature.
deg
At 18:07 1/3/02 -0500, you wrote:
>I'm making an underglaze pigment (gosu).Instructions say to calcine cobalt
>and other materials to 1700 C in a crucible. I have kaolin, ball clay, AP
>Green clay, alumna, kyanite, bentonite, etc., on hand, but no porcelain or
>'crucible' clay. Does anybody have a recipe to share for a 'crucible' body,
>which I assume means a very high fire body. It doesn't have to be too
>plastic, since I could hump-mold a 'crucibowl' easily enough, I think.
>Thanks, John Stromnes, Polson MT
>
>______________________________________________________________________________
>Send postings to clayart@lsv.ceramics.org
>
>You may look at the archives for the list or change your subscription
>settings from http://www.ceramics.org/clayart/
>
>Moderator of the list is Mel Jacobson who may be reached at
>melpots@pclink.com.
---------------------------
Dewitt Gimblet
dewitt@texas.net
Austin, TX
---------------------------
iandol on sat 5 jan 02
Dear Michael C Hill,
Thank you for posting that recipe. Is there anything special about the =
grogs you are using or could I substitute Sillimanite without any cares =
or worries?
Best regards,
Ivor Lewis. Redhill, South Australia
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