Connie Pike on mon 26 feb 01
from Bob Pike
Is it possible to add any specific material to a very vitrious cone 10
porcelain so it will act more like a white stoneware? (less vitrified, and
without the warping problems of porcelain?) I can't add any grog as I'm
using this body to extrude. Do any materials give the body more strength to
resist deforming at vitrification?
If there is anyone who can help with this, I would appreciate it.
--
Bob and Connie Pike Pike Studios Ltd.
High River, Alberta
http://www.pikestudios.com
pikec@cadvision.com
Wade Blocker on mon 26 feb 01
Bob and Connie,
I have used the following method when working with porcelain:
Crush some dry clay from your porcelain to a fine powder and bisque it.
Then wedge this calcined powder into your porcelain. I found that this
worked for me when throwing a larger form with a porcelain body. Mia in
overcast ABQ
Susan Fox Hirschmann on mon 26 feb 01
I am having a time with my thrown 24" porcelain plates. They make it great
thru the bisque and even the glaze firing, but dispite my firing them up and
firing them down to cone 10, the cooling, below 200degrees is where they
start to crack starting on the rim and working in and then up. They bgin
with a PING that would send shivers up any potter's spine. They are a
challenge to COMPLETE but they are such fun to throw that I would actually
like to get one fired in ONE PIECE>
I am using Highwater Helio clay and only have this problem on large plates.
Years ago, I decided to do them as well, and eventually gave them up, despite
consultation with Jeff Z. Now I have decided to try again.
any wisdom out there would be greatly appreciated.
Susan
F. H.
michael wendt on tue 27 feb 01
This came up last year and I still suggest that you fire the plates with a
protective ring of insulating firebrick around the entire edge. Also, center
the pieces in the middle of your kiln and fire taller layers directly above
and below. This nearly approximates firing on edge for uniformity of heating
and cooling.
Regards,
Michael Wendt wendtpot@lewiston.com
Des Howard on wed 28 feb 01
Bob & Connie
To reduce the vitrification of your porcelain body
& the warping, (I'm assuming it's firing warping not
drying warping), add for starters 10 - 15% of a
plastic kaolin or light firing ballclay.
Des
--
Des & Jan Howard
Lue Pottery
LUE NSW 2850
Australia
Ph/Fax 02 6373 6419
http://www.luepottery.lisp.com.au
| |
|
