Ric Swenson on fri 1 aug 08
Kyanite proved to be a good additive (10%) to the stoneware we made at Bennington Potters. In particular....It cut the dunting of large lasagna dishes coming from the fast fire tunnel kiln remarkably, and made them more oven resistant in daily use.
I tested the pieces by quenching them in cold water....directly from the exit car of the tunnel kiln. Cone 6. A 9 hour and fourty minute cool to cool cycle....once fired ware. Ram pressed production. Loss rate went from 22 % to less than 2 %
Regards,
Ric
"...then fiery expedition be my wing, ..." -Wm. Shakespeare, RICHARD III, Act IV Scene III Richard H. ("Ric") Swenson, Teacher, Office of International Cooperation and Exchange of Jingdezhen Ceramic Institute, TaoYang Road, Eastern Suburb, Jingdezhen City.JiangXi Province, P.R. of China. Postal code 333001. Mobile/cellular phone : 86 13767818872 < RicSwenson0823@hotmail.com> http://www.jci.jx.cn/http://www.ricswenson.com
> Date: Wed, 30 Jul 2008 12:46:40 -0600> From: debthuman@ZIANET.COM> Subject: Using pieces in the oven> To: CLAYART@LSV.CERAMICS.ORG> > I have used B Mix with Sand, ^10 for bread pans. These are my bread> pans, so if there's a problem, I'm the one who is going to be having> it. I've been told not to put a ceramic piece into a pre-heated oven.> But.... bread needs to go into a pre-heated oven.> > I have a gas stove. I put the bread pan (with the dough in it) next to> the heat vents on the top of the stove while the oven preheats. When> the oven gets to 425, I put the pan in the oven.> > I've done this a lot and never had any problems. I have made great> bread in these pans. Obviously, I'm doing something right - but I've> no idea what it is.> > Is it the sand in the clay that helps with the thermo shock? Is it> leaving the pan by the hot air vent so the pan heats up a tad? Am I> merely the luckiest bread baker in the universe?> > I have some ^6 with kyanite that I'm told by Coyote Clay (where I get> the clay) that it can be used for raku. I'm wondering if the kyanite> will make ^6 bread pans resistant to breaking in the oven?> > Many thanks.> > Deb Thuman> http://debthumansblog.blogspot.com/> http://www.etsy.com/shop.php?user_id=5888059
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Ron Roy on wed 6 aug 08
Kyanite (silmanite) is used to lower clay body expansion during heating and
contraction during cooling - which lowers the risk of oven ware cracking
when heated unevenly.
RR
>Kyanite proved to be a good additive (10%) to the stoneware we made at
>Bennington Potters. In particular....It cut the dunting of large lasagna
>dishes coming from the fast fire tunnel kiln remarkably, and made them
>more oven resistant in daily use.
>
>
> I tested the pieces by quenching them in cold water....directly from the
>exit car of the tunnel kiln. Cone 6. A 9 hour and fourty minute cool to
>cool cycle....once fired ware. Ram pressed production. Loss rate went from
>22 % to less than 2 %
>
>Regards,
>
>Ric
Ron Roy
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Ivor and Olive Lewis on thu 7 aug 08
Kyanite, Sillimanite and Mullite have an additional advantage over
quartz as a refractory. They do not appear to have any structural
phase changes which would induce dunting.
Best regards,
Ivor Lewis.
Redhill,
South Australia.
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