Lee Love on wed 24 aug 05
maturation temp)
From: Ben Shelton wrote:
> Logic would point me towards increasing the silica and alumina in relation
> to the fluxes (or lowering the flux content) BUT the other day I was
> reading
> up on Eutectic effects. WHOOOOOOAAA that throws a monkey wrench into it.
Ben,
You are on the right track. Leach says to add .5% kaolin for
every 1% of RIOx added. See my post below from when my Taiko was a
puppy :-) :
*Date:* Fri, 6 Dec 1996 04:46:28 EST
*Reply-To:* LeeLove@millcomm.com
*Sender:* Ceramic Arts Discussion List
*From:* "Akita-jin \"Lee Love\""
*Organization:* IKIRU "TO LIVE" http://www.millcomm.com/~leelove
*Subject:* Re: Khaki and Tenmoku**
----------------------------Original message----------------------------
Rafael Molina-Rodriguez (Rafael Molina-Rodriguez) wrote: <...> >
Speaking of Khaki and Tenmoku, someone on the list correct me if I'm >
wrong about a particular family of ^ 10 glazes. A Celadon, Khaki, and >
Tenmoku can be created from a single base, such as the Leach base, >
just by increasing the amount of red iron oxide from 2%, 8%, and 10%. >
Leach Base ^ 9-11 Reduction > Kaolin 10 > Whiting 20 > Flint 30 > Potash
Feldspar 40
In _A Potter's Book_, the above glaze is listed as a cone 8 Limestone
glaze. Leach says to add 1/2% china clay for every 1% RIOX added to keep
it at cone 8. At the Northern Clay Center, this is their studio Temmoku
(with 10% iron added, and no extra kaolin) fired to 9/10 and students
are always sticking their pots to the shelves with this glaze. Iron is a
flux in reduction.
Lee ==================================================== /(o\ Lee Love
In "St. Paul", MN ' Come see some pixs of my AkitaPup: \o)/
mailto:LeeLove@millcomm.com ' http://www.millcomm.com/~leelove
mailto:AkitaJin@Cryogen.com ' "It
gets late early out there." -Yogi Berra-
--
Lee Love
in Mashiko, Japan http://mashiko.org
http://seisokuro.blogspot.com/ My Photo Logs
"Our scientific power has outrun our spiritual power. We have guided missiles and misguided men.
--Martin Luther King Jr.
Lee Love on sun 28 aug 05
maturation temp)
Ben Shelton wrote:
> I'll be using Glaze master if ever I get my "shop" computer up and running
> I don't know if it has this feature or not.
> Lee Love's suggestions from Leach is add 0.5% Kaolin for every 1% of
> added RIO.
Ben, If you do want to reduce the flux, you really don't have to
calculate. Just do a lineblend with differing reductions in the
amount of flux. You could do the same with additions of kaolin if you
want to. The kaolin works with leach 4321 tenmoku.
When you use these traditional techniques, you often discover
something better than what you were aiming at.
--
Lee Love
in Mashiko, Japan http://mashiko.org
http://seisokuro.blogspot.com/ My Photo Logs
"Our scientific power has outrun our spiritual power. We have guided missiles and misguided men.
--Martin Luther King Jr. (1929 - 1968)
Ron Roy on sun 28 aug 05
maturation temp)
That depends on which fluxes and what they are combined with.
For instance - feldspars are where the KNaO usually is - also alumina and
silica - so - if you are trying to compensate for iron in reduction and
want to lower the expansin rate to cure crazing at the same time - you need
to calculate to get the alumina and silica back up after you remove some of
the KNaO.
Same thing with frits - if you want the same thing you need to "see" what
is happening and why.
Calculating before you line blend is an excelent way to learn what happens
when you make alterations - and you can address the fit issue at the same
time.
RR
>Ben, If you do want to reduce the flux, you really don't have to
>calculate. Just do a lineblend with differing reductions in the
>amount of flux. You could do the same with additions of kaolin if you
>want to. The kaolin works with leach 4321 tenmoku.
>
> When you use these traditional techniques, you often discover
>something better than what you were aiming at.
Ron Roy
RR#4
15084 Little Lake Road
Brighton, Ontario
Canada
K0K 1H0
Phone: 613-475-9544
Fax: 613-475-3513
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