Steve Mills on sat 11 dec 10
Several other artists with the same problem have used Kyanite to good effec=
t=3D
, especially those making large scale work in the Raku Process; its jagged =
p=3D
rofile acts as an excellent binder, but is fine enough not to tear your han=
d=3D
s to bits. It is also highly refractory so you'd still have cone 10 capabil=
i=3D
ty.
Steve M
Steve Mills
Bath
UK
On 11 Dec 2010, at 01:00, mudduck wrote:
> A friend of mine is using Standard 119 clay for cone 10 reduction, horseh=
a=3D
ir and some raku. He is having good results with the horsehair and raku, bu=
t=3D
will sometimes get cracks on larger pieces. Standard 119 already has sand =
i=3D
n it to open it up. At least I think it's sand and not grog.
>=3D20
> What my friend would like to do is add mullite to the 119 to make it a li=
t=3D
tle more tolerant to the raku process. Does anyone know how much mullite ca=
n=3D
safely added to the stoneware clay to make it more durable for raku, witho=
u=3D
t changing it from a cone 10 clay??
>=3D20
> He doesn't want to switch clay or have two clays in the studio. Just tryi=
n=3D
g to tweak this one a little.
>=3D20
>=3D20
>=3D20
> Gene
> mudduck@mudduckpottery.net
> www.mudduckpottery.net
Ric Swenson on sat 11 dec 10
IMHO Kyanite is a good addition to fast fire bodies....using tunnel kilns t=
hat fire to cone 6 (cool to cool in 7 hours) we cut the 'loss to dunting' =
for large RAM pressed pieces to almost zero...from 20 % losses at Benningto=
n Potters. It is when we finally started to make a profit in the late 1980=
s.
It adds a great deal of resistance to thermal shock for once fired/fast fir=
ed wares. It makes the finished body just a bit rougher...but the benefits=
far outweigh the slightly rougher final product. We added 10 % to our sta=
ndard stoneware body and it was a great savings.
It is a good material to assure thermal shock resisitance in any body IMHO.=
Raku is a good example. Sculpture clay would also benefit I imagine....th=
at and grog... to help the drying properties.
Best regards from China.
Ric
http:blog.sina.com.cn/ricswenson
"...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 Inst=
itute,
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
> Date: Sat, 11 Dec 2010 09:49:39 +0000
> From: original.mudslinger@GMAIL.COM
> Subject: Re: mullite - try Kyanite!
> To: Clayart@LSV.CERAMICS.ORG
>
> Several other artists with the same problem have used Kyanite to good eff=
ect, especially those making large scale work in the Raku Process; its jagg=
ed profile acts as an excellent binder, but is fine enough not to tear your=
hands to bits. It is also highly refractory so you'd still have cone 10 ca=
pability.
>
> Steve M
>
> Steve Mills
> Bath
> UK
>
> On 11 Dec 2010, at 01:00, mudduck wrote:
>
> > A friend of mine is using Standard 119 clay for cone 10 reduction, hors=
ehair and some raku. He is having good results with the horsehair and raku,=
but will sometimes get cracks on larger pieces. Standard 119 already has s=
and in it to open it up. At least I think it's sand and not grog.
> >
> > What my friend would like to do is add mullite to the 119 to make it a =
little more tolerant to the raku process. Does anyone know how much mullite=
can safely added to the stoneware clay to make it more durable for raku, w=
ithout changing it from a cone 10 clay??
> >
> > He doesn't want to switch clay or have two clays in the studio. Just tr=
ying to tweak this one a little.
> >
> >
> >
> > Gene
> > mudduck@mudduckpottery.net
> > www.mudduckpottery.net
William & Susan Schran User on sat 11 dec 10
On 12/11/10 4:49 AM, "Steve Mills" wrote:
> Several other artists with the same problem have used Kyanite to good eff=
ect,
> especially those making large scale work in the Raku Process; its jagged
> profile acts as an excellent binder, but is fine enough not to tear your =
hands
> to bits. It is also highly refractory so you'd still have cone 10 capabil=
ity.
Here's a site from a kyanite mining company that addresses kyanite and
mullite: http://www.kyanite.com/index.html
Bill
--
William "Bill" Schran
wschran@cox.net
wschran@nvcc.edu
http://www.creativecreekartisans.com
ivor and olive lewis on sun 12 dec 10
Or alternatively, seek out Sillimanite.
Ivor Lewis,
REDHILL,
South Australia
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